Take out print_times from sample

Fix sample input file.
Disable MATCHBOX with SERIAL_MPI and add error message
2026-10-07 07:04:59 +00:00 · 2023-11-26 19:28:03 +01:00 · 2023-11-26 14:32:32 +01:00 · 2023-11-26 11:43:10 +01:00 · 2023-11-24 16:07:22 +01:00 · 2023-11-16 17:55:42 +01:00
42 changed files with 951 additions and 438 deletions
@@ -3,9 +3,9 @@ include Make.inc

 all:  objs lib

-objs: amgp cbnd
+objs: libdir amgp cbnd

-lib: libdir objs
+lib:  objs
 	cd amgprec && $(MAKE) lib
 	cd cbind && $(MAKE)  lib

@@ -403,7 +403,10 @@ contains
    info = psb_success_

    call sv%a%free()
-    call sv%dv%free(info)
+    if (allocated(sv%dv)) then
+      call sv%dv%free(info)
+      deallocate(sv%dv)
+    end if
    if (allocated(sv%d)) deallocate(sv%d)

    call psb_erractionrestore(err_act)
@@ -403,7 +403,10 @@ contains
    info = psb_success_

    call sv%a%free()
-    call sv%dv%free(info)
+    if (allocated(sv%dv)) then
+      call sv%dv%free(info)
+      deallocate(sv%dv)
+    end if
    if (allocated(sv%d)) deallocate(sv%d)

    call psb_erractionrestore(err_act)
@@ -403,7 +403,10 @@ contains
    info = psb_success_

    call sv%a%free()
-    call sv%dv%free(info)
+    if (allocated(sv%dv)) then
+      call sv%dv%free(info)
+      deallocate(sv%dv)
+    end if
    if (allocated(sv%d)) deallocate(sv%d)

    call psb_erractionrestore(err_act)
@@ -403,7 +403,10 @@ contains
    info = psb_success_

    call sv%a%free()
-    call sv%dv%free(info)
+    if (allocated(sv%dv)) then
+      call sv%dv%free(info)
+      deallocate(sv%dv)
+    end if
    if (allocated(sv%d)) deallocate(sv%d)

    call psb_erractionrestore(err_act)
@@ -42,7 +42,6 @@
 #include <stdlib.h>
 #if !defined(SERIAL_MPI)
 #include <mpi.h>
-#endif

 #include "MatchBoxPC.h"
 #ifdef __cplusplus
@@ -127,3 +126,4 @@ void sMatchBoxPC(MilanLongInt NLVer, MilanLongInt NLEdge,
 #ifdef __cplusplus
 }
 #endif
+#endif
@@ -78,6 +78,8 @@ const int BundleTag = 9;  // Predefined tag

 static vector<MilanLongInt> DEFAULT_VECTOR;

+#if !defined(SERIAL_MPI)
+
 // MPI type map
 template <typename T>
 MPI_Datatype TypeMap();
@@ -89,6 +91,7 @@ template <>
 inline MPI_Datatype TypeMap<double>() { return MPI_DOUBLE; }
 template <>
 inline MPI_Datatype TypeMap<float>() { return MPI_FLOAT; }
+#endif

 #ifdef __cplusplus
 extern "C"
@@ -1,6 +1,7 @@
 #include "MatchBoxPC.h"

 // TODO comment
+#if !defined(SERIAL_MPI)

 void clean(MilanLongInt NLVer,
           MilanInt myRank,
@@ -89,3 +90,4 @@ void clean(MilanLongInt NLVer,
        }
    }
 }
+#endif
@@ -9,6 +9,8 @@
 * @param edgeLocWeight
 * @return
 */
+#if !defined(SERIAL_MPI)
+
 MilanLongInt firstComputeCandidateMate(MilanLongInt adj1,
                                       MilanLongInt adj2,
                                       MilanLongInt *verLocInd,
@@ -71,3 +73,4 @@ MilanLongInt computeCandidateMate(MilanLongInt adj1,
    
    return w;
 }
+#endif
@@ -1,4 +1,5 @@
 #include "MatchBoxPC.h"
+#if !defined(SERIAL_MPI)

 void PARALLEL_COMPUTE_CANDIDATE_MATE_B(MilanLongInt NLVer,
                                              MilanLongInt *verLocPtr,
@@ -25,3 +26,4 @@ void PARALLEL_COMPUTE_CANDIDATE_MATE_B(MilanLongInt NLVer,
        }
    }
 }
+#endif
@@ -1,4 +1,5 @@
 #include "MatchBoxPC.h"
+#if !defined(SERIAL_MPI)

 void PARALLEL_PROCESS_EXPOSED_VERTEX_B(MilanLongInt NLVer,
                                       MilanLongInt *candidateMate,
@@ -193,3 +194,4 @@ void PARALLEL_PROCESS_EXPOSED_VERTEX_B(MilanLongInt NLVer,

    } // End of parallel region
 }
+#endif
@@ -1,5 +1,6 @@
 #include "MatchBoxPC.h"

+#if !defined(SERIAL_MPI)
 void processMatchedVertices(
    MilanLongInt NLVer,
    vector<MilanLongInt> &UChunkBeingProcessed,
@@ -292,3 +293,4 @@ void processMatchedVertices(
 #endif
    } // End of parallel region
 }
+#endif
@@ -1,5 +1,6 @@
 #include "MatchBoxPC.h"
 //#define DEBUG_HANG_
+#if !defined(SERIAL_MPI)
 void processMatchedVerticesAndSendMessages(
 					   MilanLongInt NLVer,
 					   vector<MilanLongInt> &UChunkBeingProcessed,
@@ -306,3 +307,4 @@ void processMatchedVerticesAndSendMessages(
    cout << myRank<<" Done sending messages"<<endl;
 #endif
 }
+#endif
@@ -1,5 +1,6 @@
 #include "MatchBoxPC.h"
 //#define DEBUG_HANG_
+#if !defined(SERIAL_MPI)

 void processMessages(
    MilanLongInt NLVer,
@@ -313,3 +314,4 @@ void processMessages(
    
    return;
 }
+#endif
@@ -1,5 +1,5 @@
 #include "MatchBoxPC.h"
-
+#if !defined(SERIAL_MPI)
 void sendBundledMessages(MilanLongInt *numGhostEdges,
                                MilanInt *BufferSize,
                                MilanLongInt *Buffer,
@@ -207,3 +207,4 @@ void sendBundledMessages(MilanLongInt *numGhostEdges,
 }
 }
 }
+#endif
@@ -42,6 +42,8 @@ subroutine amg_c_base_onelev_csetc(lv,what,val,info,pos,idx)
  use amg_c_base_aggregator_mod
  use amg_c_dec_aggregator_mod
  use amg_c_symdec_aggregator_mod
+#if !defined(SERIAL_MPI)
+#endif
  use amg_c_jac_smoother
  use amg_c_as_smoother
  use amg_c_diag_solver
@@ -246,6 +248,8 @@ subroutine amg_c_base_onelev_csetc(lv,what,val,info,pos,idx)
      if (info == 0) deallocate(lv%aggr,stat=info)
      if (info /= 0) then
        info = psb_err_internal_error_
+        call psb_errpush(info,name,a_err='aggregator deallocation?')
+        goto 9999
        return
      end if
    end if
@@ -255,8 +259,16 @@ subroutine amg_c_base_onelev_csetc(lv,what,val,info,pos,idx)
      allocate(amg_c_dec_aggregator_type :: lv%aggr, stat=info)
    case('SYMDEC')
      allocate(amg_c_symdec_aggregator_type :: lv%aggr, stat=info)
-    case default
+#if !defined(SERIAL_MPI)
+#endif
+  case default
      info =  psb_err_internal_error_
+#if !defined(SERIAL_MPI)
+      call psb_errpush(info,name,a_err='Unsupported PAR_AGGR_ALG')
+#else
+      call psb_errpush(info,name,a_err='PAR_AGGR_ALG unsupported (SERIAL_MPI on)')
+#endif
+      goto 9999
    end select
    if (info == psb_success_) call lv%aggr%default()

@@ -42,7 +42,9 @@ subroutine amg_d_base_onelev_csetc(lv,what,val,info,pos,idx)
  use amg_d_base_aggregator_mod
  use amg_d_dec_aggregator_mod
  use amg_d_symdec_aggregator_mod
+#if !defined(SERIAL_MPI)
  use amg_d_parmatch_aggregator_mod
+#endif
  use amg_d_jac_smoother
  use amg_d_as_smoother
  use amg_d_diag_solver
@@ -267,6 +269,8 @@ subroutine amg_d_base_onelev_csetc(lv,what,val,info,pos,idx)
      if (info == 0) deallocate(lv%aggr,stat=info)
      if (info /= 0) then
        info = psb_err_internal_error_
+        call psb_errpush(info,name,a_err='aggregator deallocation?')
+        goto 9999
        return
      end if
    end if
@@ -276,10 +280,18 @@ subroutine amg_d_base_onelev_csetc(lv,what,val,info,pos,idx)
      allocate(amg_d_dec_aggregator_type :: lv%aggr, stat=info)
    case('SYMDEC')
      allocate(amg_d_symdec_aggregator_type :: lv%aggr, stat=info)
+#if !defined(SERIAL_MPI)
    case('COUP','COUPLED')
      allocate(amg_d_parmatch_aggregator_type :: lv%aggr, stat=info)
-    case default
+#endif
+  case default
      info =  psb_err_internal_error_
+#if !defined(SERIAL_MPI)
+      call psb_errpush(info,name,a_err='Unsupported PAR_AGGR_ALG')
+#else
+      call psb_errpush(info,name,a_err='PAR_AGGR_ALG unsupported (SERIAL_MPI on)')
+#endif
+      goto 9999
    end select
    if (info == psb_success_) call lv%aggr%default()

@@ -42,7 +42,9 @@ subroutine amg_s_base_onelev_csetc(lv,what,val,info,pos,idx)
  use amg_s_base_aggregator_mod
  use amg_s_dec_aggregator_mod
  use amg_s_symdec_aggregator_mod
+#if !defined(SERIAL_MPI)
  use amg_s_parmatch_aggregator_mod
+#endif
  use amg_s_jac_smoother
  use amg_s_as_smoother
  use amg_s_diag_solver
@@ -247,6 +249,8 @@ subroutine amg_s_base_onelev_csetc(lv,what,val,info,pos,idx)
      if (info == 0) deallocate(lv%aggr,stat=info)
      if (info /= 0) then
        info = psb_err_internal_error_
+        call psb_errpush(info,name,a_err='aggregator deallocation?')
+        goto 9999
        return
      end if
    end if
@@ -256,10 +260,18 @@ subroutine amg_s_base_onelev_csetc(lv,what,val,info,pos,idx)
      allocate(amg_s_dec_aggregator_type :: lv%aggr, stat=info)
    case('SYMDEC')
      allocate(amg_s_symdec_aggregator_type :: lv%aggr, stat=info)
+#if !defined(SERIAL_MPI)
    case('COUP','COUPLED')
      allocate(amg_s_parmatch_aggregator_type :: lv%aggr, stat=info)
-    case default
+#endif
+  case default
      info =  psb_err_internal_error_
+#if !defined(SERIAL_MPI)
+      call psb_errpush(info,name,a_err='Unsupported PAR_AGGR_ALG')
+#else
+      call psb_errpush(info,name,a_err='PAR_AGGR_ALG unsupported (SERIAL_MPI on)')
+#endif
+      goto 9999
    end select
    if (info == psb_success_) call lv%aggr%default()

@@ -42,6 +42,8 @@ subroutine amg_z_base_onelev_csetc(lv,what,val,info,pos,idx)
  use amg_z_base_aggregator_mod
  use amg_z_dec_aggregator_mod
  use amg_z_symdec_aggregator_mod
+#if !defined(SERIAL_MPI)
+#endif
  use amg_z_jac_smoother
  use amg_z_as_smoother
  use amg_z_diag_solver
@@ -266,6 +268,8 @@ subroutine amg_z_base_onelev_csetc(lv,what,val,info,pos,idx)
      if (info == 0) deallocate(lv%aggr,stat=info)
      if (info /= 0) then
        info = psb_err_internal_error_
+        call psb_errpush(info,name,a_err='aggregator deallocation?')
+        goto 9999
        return
      end if
    end if
@@ -275,8 +279,16 @@ subroutine amg_z_base_onelev_csetc(lv,what,val,info,pos,idx)
      allocate(amg_z_dec_aggregator_type :: lv%aggr, stat=info)
    case('SYMDEC')
      allocate(amg_z_symdec_aggregator_type :: lv%aggr, stat=info)
-    case default
+#if !defined(SERIAL_MPI)
+#endif
+  case default
      info =  psb_err_internal_error_
+#if !defined(SERIAL_MPI)
+      call psb_errpush(info,name,a_err='Unsupported PAR_AGGR_ALG')
+#else
+      call psb_errpush(info,name,a_err='PAR_AGGR_ALG unsupported (SERIAL_MPI on)')
+#endif
+      goto 9999
    end select
    if (info == psb_success_) call lv%aggr%default()

@@ -8,23 +8,27 @@ FINCLUDES=$(FMFLAG). $(FMFLAG)$(AMGMODDIR) $(FMFLAG)$(AMGINCDIR) $(PSBLAS_INCLUD

 LINKOPT=
 EXEDIR=./runs
+DGEN2D=amg_d_pde2d_base_mod.o amg_d_pde2d_exp_mod.o amg_d_pde2d_gauss_mod.o amg_d_pde2d_box_mod.o
+DGEN3D=amg_d_pde3d_base_mod.o amg_d_pde3d_exp_mod.o amg_d_pde3d_gauss_mod.o amg_d_pde3d_box_mod.o 	
+SGEN2D=amg_s_pde2d_base_mod.o amg_s_pde2d_exp_mod.o amg_s_pde2d_gauss_mod.o amg_s_pde2d_box_mod.o
+SGEN3D=amg_s_pde3d_base_mod.o amg_s_pde3d_exp_mod.o amg_s_pde3d_gauss_mod.o amg_s_pde3d_box_mod.o 	

 all: amg_s_pde3d amg_d_pde3d amg_s_pde2d amg_d_pde2d

-amg_d_pde3d: amg_d_pde3d.o amg_d_genpde_mod.o amg_d_pde3d_base_mod.o amg_d_pde3d_exp_mod.o amg_d_pde3d_gauss_mod.o data_input.o
-	$(FLINK) $(LINKOPT) amg_d_pde3d.o  amg_d_genpde_mod.o amg_d_pde3d_base_mod.o amg_d_pde3d_exp_mod.o amg_d_pde3d_gauss_mod.o data_input.o -o amg_d_pde3d $(AMG_LIBS) $(PSBLAS_LIBS) $(LDLIBS)
+amg_d_pde3d: amg_d_pde3d.o amg_d_genpde_mod.o $(DGEN3D) data_input.o
+	$(FLINK) $(LINKOPT) amg_d_pde3d.o  amg_d_genpde_mod.o $(DGEN3D) data_input.o -o amg_d_pde3d $(AMG_LIBS) $(PSBLAS_LIBS) $(LDLIBS)
 	/bin/mv amg_d_pde3d $(EXEDIR)

-amg_s_pde3d: amg_s_pde3d.o amg_s_genpde_mod.o amg_s_pde3d_base_mod.o  amg_s_pde3d_exp_mod.o amg_s_pde3d_gauss_mod.o data_input.o
-	$(FLINK) $(LINKOPT) amg_s_pde3d.o  amg_s_genpde_mod.o amg_s_pde3d_base_mod.o amg_s_pde3d_exp_mod.o amg_s_pde3d_gauss_mod.o data_input.o -o amg_s_pde3d $(AMG_LIBS) $(PSBLAS_LIBS) $(LDLIBS)
+amg_s_pde3d: amg_s_pde3d.o amg_s_genpde_mod.o $(SGEN3D) data_input.o
+	$(FLINK) $(LINKOPT) amg_s_pde3d.o  amg_s_genpde_mod.o  $(SGEN3D) data_input.o -o amg_s_pde3d $(AMG_LIBS) $(PSBLAS_LIBS) $(LDLIBS)
 	/bin/mv amg_s_pde3d $(EXEDIR)

-amg_d_pde2d: amg_d_pde2d.o amg_d_genpde_mod.o amg_d_pde2d_base_mod.o amg_d_pde2d_exp_mod.o amg_d_pde2d_box_mod.o data_input.o
-	$(FLINK) $(LINKOPT) amg_d_pde2d.o amg_d_genpde_mod.o amg_d_pde2d_base_mod.o amg_d_pde2d_exp_mod.o amg_d_pde2d_box_mod.o data_input.o -o amg_d_pde2d $(AMG_LIBS) $(PSBLAS_LIBS) $(LDLIBS)
+amg_d_pde2d: amg_d_pde2d.o amg_d_genpde_mod.o  $(DGEN2D) data_input.o
+	$(FLINK) $(LINKOPT) amg_d_pde2d.o amg_d_genpde_mod.o $(DGEN2D) data_input.o -o amg_d_pde2d $(AMG_LIBS) $(PSBLAS_LIBS) $(LDLIBS)
 	/bin/mv amg_d_pde2d $(EXEDIR)

-amg_s_pde2d: amg_s_pde2d.o amg_s_genpde_mod.o amg_s_pde2d_base_mod.o amg_s_pde2d_exp_mod.o amg_s_pde2d_box_mod.o data_input.o
-	$(FLINK) $(LINKOPT) amg_s_pde2d.o amg_s_genpde_mod.o amg_s_pde2d_base_mod.o amg_s_pde2d_exp_mod.o amg_s_pde2d_box_mod.o data_input.o -o amg_s_pde2d $(AMG_LIBS) $(PSBLAS_LIBS) $(LDLIBS)
+amg_s_pde2d: amg_s_pde2d.o amg_s_genpde_mod.o $(SGEN2D) data_input.o
+	$(FLINK) $(LINKOPT) amg_s_pde2d.o amg_s_genpde_mod.o $(SGEN2D) data_input.o -o amg_s_pde2d $(AMG_LIBS) $(PSBLAS_LIBS) $(LDLIBS)
 	/bin/mv amg_s_pde2d $(EXEDIR)

 amg_d_pde3d_rebld: amg_d_pde3d_rebld.o  data_input.o
@@ -33,10 +37,10 @@ amg_d_pde3d_rebld: amg_d_pde3d_rebld.o  data_input.o

 amg_d_pde3d.o amg_s_pde3d.o amg_d_pde2d.o amg_s_pde2d.o: data_input.o

-amg_d_pde3d.o: amg_d_genpde_mod.o amg_d_pde3d_base_mod.o amg_d_pde3d_exp_mod.o amg_d_pde3d_gauss_mod.o
-amg_s_pde3d.o: amg_s_genpde_mod.o amg_s_pde3d_base_mod.o amg_s_pde3d_exp_mod.o amg_s_pde3d_gauss_mod.o
-amg_d_pde2d.o: amg_d_genpde_mod.o amg_d_pde2d_base_mod.o amg_d_pde2d_exp_mod.o amg_d_pde2d_box_mod.o
-amg_s_pde2d.o: amg_s_genpde_mod.o amg_s_pde2d_base_mod.o amg_s_pde2d_exp_mod.o amg_s_pde2d_box_mod.o
+amg_d_pde3d.o: amg_d_genpde_mod.o $(DGEN3D)
+amg_s_pde3d.o: amg_s_genpde_mod.o $(SGEN3D) 
+amg_d_pde2d.o: amg_d_genpde_mod.o $(DGEN2D)
+amg_s_pde2d.o: amg_s_genpde_mod.o $(SGEN2D)

 check: all
 	cd runs && ./amg_d_pde2d <amg_pde2d.inp && ./amg_s_pde2d<amg_pde2d.inp
@@ -72,6 +72,7 @@ program amg_d_pde2d
  use amg_d_pde2d_base_mod
  use amg_d_pde2d_exp_mod
  use amg_d_pde2d_box_mod
+  use amg_d_pde2d_gauss_mod
  use amg_d_genpde_mod
 #if defined(OPENMP)
  use omp_lib
@@ -124,16 +125,16 @@ program amg_d_pde2d
    integer(psb_ipk_)  :: outer_sweeps ! number of outer sweeps: sweeps for 1-level,
    ! AMG cycles for ML
    ! general AMG data
-    character(len=16)  :: mlcycle      ! AMG cycle type
+    character(len=32)  :: mlcycle      ! AMG cycle type
    integer(psb_ipk_)  :: maxlevs     ! maximum number of levels in AMG preconditioner

    ! AMG aggregation
-    character(len=16)  :: aggr_prol    ! aggregation type: SMOOTHED, NONSMOOTHED
-    character(len=16)  :: par_aggr_alg ! parallel aggregation algorithm: DEC, SYMDEC
-    character(len=16)  :: aggr_type   ! Type of aggregation SOC1, SOC2, MATCHBOXP
+    character(len=32)  :: aggr_prol    ! aggregation type: SMOOTHED, NONSMOOTHED
+    character(len=32)  :: par_aggr_alg ! parallel aggregation algorithm: DEC, SYMDEC
+    character(len=32)  :: aggr_type   ! Type of aggregation SOC1, SOC2, MATCHBOXP
    integer(psb_ipk_)  :: aggr_size   ! Requested size of the aggregates for MATCHBOXP
-    character(len=16)  :: aggr_ord    ! ordering for aggregation: NATURAL, DEGREE
-    character(len=16)  :: aggr_filter ! filtering: FILTER, NO_FILTER
+    character(len=32)  :: aggr_ord    ! ordering for aggregation: NATURAL, DEGREE
+    character(len=32)  :: aggr_filter ! filtering: FILTER, NO_FILTER
    real(psb_dpk_)     :: mncrratio  ! minimum aggregation ratio
    real(psb_dpk_), allocatable :: athresv(:) ! smoothed aggregation threshold vector
    integer(psb_ipk_)  :: thrvsz      ! size of threshold vector
@@ -141,37 +142,39 @@ program amg_d_pde2d
    integer(psb_ipk_)  :: csizepp     ! minimum size of coarsest matrix per process

    ! AMG smoother or pre-smoother; also 1-lev preconditioner
-    character(len=16)  :: smther      ! (pre-)smoother type: BJAC, AS
-    integer(psb_ipk_)  :: jsweeps     ! (pre-)smoother / 1-lev prec. sweeps
-    integer(psb_ipk_)  :: novr        ! number of overlap layers
-    character(len=16)  :: restr       ! restriction over application of AS
-    character(len=16)  :: prol        ! prolongation over application of AS
-    character(len=16)  :: solve       ! local subsolver type: ILU, MILU, ILUT,
-                                      ! UMF, MUMPS, SLU, FWGS, BWGS, JAC
-    character(len=16)  :: variant     ! AINV variant: LLK, etc
-    integer(psb_ipk_)  :: fill        ! fill-in for incomplete LU factorization
-    integer(psb_ipk_)  :: invfill     ! Inverse fill-in for INVK
-    real(psb_dpk_)     :: thr         ! threshold for ILUT factorization
+    character(len=32)  :: smther       ! (pre-)smoother type: BJAC, AS
+    integer(psb_ipk_)  :: jsweeps      ! (pre-)smoother / 1-lev prec. sweeps
+    integer(psb_ipk_)  :: novr         ! number of overlap layers
+    character(len=32)  :: restr        ! restriction over application of AS
+    character(len=32)  :: prol         ! prolongation over application of AS
+    character(len=32)  :: solve        ! local subsolver type: ILU, MILU, ILUT,
+                                       ! UMF, MUMPS, SLU, FWGS, BWGS, JAC
+    integer(psb_ipk_)  :: ssweeps      ! inner solver sweeps
+    character(len=32)  :: variant      ! AINV variant: LLK, etc
+    integer(psb_ipk_)  :: fill         ! fill-in for incomplete LU factorization
+    integer(psb_ipk_)  :: invfill      ! Inverse fill-in for INVK
+    real(psb_dpk_)      :: thr          ! threshold for ILUT factorization

    ! AMG post-smoother; ignored by 1-lev preconditioner
-    character(len=16)  :: smther2     ! post-smoother type: BJAC, AS
-    integer(psb_ipk_)  :: jsweeps2    ! post-smoother sweeps
-    integer(psb_ipk_)  :: novr2       ! number of overlap layers
-    character(len=16)  :: restr2      ! restriction  over application of AS
-    character(len=16)  :: prol2       ! prolongation over application of AS
-    character(len=16)  :: solve2      ! local subsolver type: ILU, MILU, ILUT,
-                                      ! UMF, MUMPS, SLU, FWGS, BWGS, JAC
-    character(len=16)  :: variant2    ! AINV variant: LLK, etc
-    integer(psb_ipk_)  :: fill2       ! fill-in for incomplete LU factorization
-    integer(psb_ipk_)  :: invfill2    ! Inverse fill-in for INVK
-    real(psb_dpk_)      :: thr2        ! threshold for ILUT factorization
+    character(len=32)  :: smther2      ! post-smoother type: BJAC, AS
+    integer(psb_ipk_)  :: jsweeps2     ! post-smoother sweeps
+    integer(psb_ipk_)  :: novr2        ! number of overlap layers
+    character(len=32)  :: restr2       ! restriction  over application of AS
+    character(len=32)  :: prol2        ! prolongation over application of AS
+    character(len=32)  :: solve2       ! local subsolver type: ILU, MILU, ILUT,
+                                       ! UMF, MUMPS, SLU, FWGS, BWGS, JAC
+    integer(psb_ipk_)  :: ssweeps2     ! inner solver sweeps
+    character(len=32)  :: variant2     ! AINV variant: LLK, etc
+    integer(psb_ipk_)  :: fill2        ! fill-in for incomplete LU factorization
+    integer(psb_ipk_)  :: invfill2     ! Inverse fill-in for INVK
+    real(psb_dpk_)      :: thr2         ! threshold for ILUT factorization

    ! coarsest-level solver
-    character(len=16)  :: cmat        ! coarsest matrix layout: REPL, DIST
-    character(len=16)  :: csolve      ! coarsest-lev solver: BJAC, SLUDIST (distr.
+    character(len=32)  :: cmat        ! coarsest matrix layout: REPL, DIST
+    character(len=32)  :: csolve      ! coarsest-lev solver: BJAC, SLUDIST (distr.
                                      ! mat.); UMF, MUMPS, SLU, ILU, ILUT, MILU
                                      ! (repl. mat.)
-    character(len=16)  :: csbsolve    ! coarsest-lev local subsolver: ILU, ILUT,
+    character(len=32)  :: csbsolve    ! coarsest-lev local subsolver: ILU, ILUT,
                                      ! MILU, UMF, MUMPS, SLU
    integer(psb_ipk_)  :: cfill       ! fill-in for incomplete LU factorization
    real(psb_dpk_)     :: cthres      ! threshold for ILUT factorization
@@ -239,13 +242,16 @@ program amg_d_pde2d
  select case(psb_toupper(trim(pdecoeff)))
  case("CONST")
    call amg_gen_pde2d(ctxt,idim,a,b,x,desc_a,afmt,&
-        & a1,a2,b1,b2,c,g,info)
+        & a1_base,a2_base,b1_base,b2_base,c_base,g_base,info)
  case("EXP")
    call amg_gen_pde2d(ctxt,idim,a,b,x,desc_a,afmt,&
        & a1_exp,a2_exp,b1_exp,b2_exp,c_exp,g_exp,info)
  case("BOX")
    call amg_gen_pde2d(ctxt,idim,a,b,x,desc_a,afmt,&
        & a1_box,a2_box,b1_box,b2_box,c_box,g_box,info)
+  case("GAUSS")
+    call amg_gen_pde2d(ctxt,idim,a,b,x,desc_a,afmt,&
+        & a1_gauss,a2_gauss,b1_gauss,b2_gauss,c_gauss,g_gauss,info)
  case default
    info=psb_err_from_subroutine_
    ch_err='amg_gen_pdecoeff'
@@ -282,6 +288,7 @@ program amg_d_pde2d
  case ('BJAC')
    call prec%set('smoother_sweeps', p_choice%jsweeps, info)
    call prec%set('sub_solve',       p_choice%solve,   info)
+    call prec%set('solver_sweeps',   p_choice%ssweeps,   info)
    if (psb_toupper(p_choice%solve)=='MUMPS') &
         & call prec%set('mumps_loc_glob','local_solver',info)
    call prec%set('sub_fillin',      p_choice%fill,    info)
@@ -293,6 +300,7 @@ program amg_d_pde2d
    call prec%set('sub_restr',       p_choice%restr,   info)
    call prec%set('sub_prol',        p_choice%prol,    info)
    call prec%set('sub_solve',       p_choice%solve,   info)
+    call prec%set('solver_sweeps',   p_choice%ssweeps,   info)
    if (psb_toupper(p_choice%solve)=='MUMPS') &
         & call prec%set('mumps_loc_glob','local_solver',info)
    call prec%set('sub_fillin',      p_choice%fill,    info)
@@ -349,7 +357,7 @@ program amg_d_pde2d
        if (psb_toupper(p_choice%solve)=='MUMPS') &
             & call prec%set('mumps_loc_glob','local_solver',info)
      end select
-
+      call prec%set('solver_sweeps',   p_choice%ssweeps,   info)
      call prec%set('sub_fillin',      p_choice%fill,       info)
      call prec%set('inv_fillin',      p_choice%invfill,    info)
      call prec%set('sub_iluthrs',     p_choice%thr,        info)
@@ -378,7 +386,7 @@ program amg_d_pde2d
          if (psb_toupper(p_choice%solve2)=='MUMPS') &
               & call prec%set('mumps_loc_glob','local_solver',info)
        end select
-
+        call prec%set('solver_sweeps',   p_choice%ssweeps2,   info,pos='post')
        call prec%set('sub_fillin',      p_choice%fill2,     info,pos='post')
        call prec%set('inv_fillin',      p_choice%invfill2,  info,pos='post')
        call prec%set('sub_iluthrs',     p_choice%thr2,      info,pos='post')
@@ -577,6 +585,7 @@ contains
      call read_data(prec%restr,inp_unit)      ! restriction  over application of AS
      call read_data(prec%prol,inp_unit)       ! prolongation over application of AS
      call read_data(prec%solve,inp_unit)      ! local subsolver
+      call read_data(prec%ssweeps,inp_unit)    ! inner solver sweeps 
      call read_data(prec%variant,inp_unit)    ! AINV variant
      call read_data(prec%fill,inp_unit)       ! fill-in for incomplete LU
      call read_data(prec%invfill,inp_unit)    !Inverse fill-in for INVK
@@ -588,6 +597,7 @@ contains
      call read_data(prec%restr2,inp_unit)      ! restriction  over application of AS
      call read_data(prec%prol2,inp_unit)       ! prolongation over application of AS
      call read_data(prec%solve2,inp_unit)      ! local subsolver
+      call read_data(prec%ssweeps2,inp_unit)    ! inner solver sweeps 
      call read_data(prec%variant2,inp_unit)    ! AINV variant
      call read_data(prec%fill2,inp_unit)       ! fill-in for incomplete LU
      call read_data(prec%invfill2,inp_unit)    !Inverse fill-in for INVK
@@ -657,6 +667,7 @@ contains
    call psb_bcast(ctxt,prec%restr)
    call psb_bcast(ctxt,prec%prol)
    call psb_bcast(ctxt,prec%solve)
+    call psb_bcast(ctxt,prec%ssweeps)
    call psb_bcast(ctxt,prec%variant)
    call psb_bcast(ctxt,prec%fill)
    call psb_bcast(ctxt,prec%invfill)
@@ -668,6 +679,7 @@ contains
    call psb_bcast(ctxt,prec%restr2)
    call psb_bcast(ctxt,prec%prol2)
    call psb_bcast(ctxt,prec%solve2)
+    call psb_bcast(ctxt,prec%ssweeps2)
    call psb_bcast(ctxt,prec%variant2)
    call psb_bcast(ctxt,prec%fill2)
    call psb_bcast(ctxt,prec%invfill2)
@@ -38,52 +38,52 @@ module amg_d_pde2d_base_mod
  use psb_base_mod, only : psb_dpk_, dzero, done
  real(psb_dpk_), save, private :: epsilon=done/80
 contains
-  subroutine pde_set_parm(dat)
+  subroutine pde_set_parm2d_base(dat)
    real(psb_dpk_), intent(in) :: dat
    epsilon = dat
-  end subroutine pde_set_parm
+  end subroutine pde_set_parm2d_base
  !
  ! functions parametrizing the differential equation
  !
-  function b1(x,y)
-    use psb_base_mod, only : psb_dpk_, dzero, done
-    real(psb_dpk_) :: b1
+  function b1_base(x,y)
+    implicit none 
+    real(psb_dpk_) :: b1_base
    real(psb_dpk_), intent(in) :: x,y
-    b1 = dzero/1.414_psb_dpk_
-  end function b1
-  function b2(x,y)
-    use psb_base_mod, only : psb_dpk_, dzero, done
-    real(psb_dpk_) ::  b2
+    b1_base = dzero/1.414_psb_dpk_
+  end function b1_base
+  function b2_base(x,y)
+    implicit none 
+    real(psb_dpk_) ::  b2_base
    real(psb_dpk_), intent(in) :: x,y
-    b2 = dzero/1.414_psb_dpk_
-  end function b2
-  function c(x,y)
-    use psb_base_mod, only : psb_dpk_, dzero, done
-    real(psb_dpk_) ::  c
+    b2_base = dzero/1.414_psb_dpk_
+  end function b2_base
+  function c_base(x,y)
+    implicit none 
+    real(psb_dpk_) ::  c_base
    real(psb_dpk_), intent(in) :: x,y
-    c = dzero
-  end function c
-  function a1(x,y)
-    use psb_base_mod, only : psb_dpk_, dzero, done
-    real(psb_dpk_) ::  a1
+    c_base = dzero
+  end function c_base
+  function a1_base(x,y)
+    implicit none 
+    real(psb_dpk_) ::  a1_base
    real(psb_dpk_), intent(in) :: x,y
-    a1=done*epsilon
-  end function a1
-  function a2(x,y)
-    use psb_base_mod, only : psb_dpk_, dzero, done
-    real(psb_dpk_) ::  a2
+    a1_base=done*epsilon
+  end function a1_base
+  function a2_base(x,y)
+    implicit none 
+    real(psb_dpk_) ::  a2_base
    real(psb_dpk_), intent(in) :: x,y
-    a2=done*epsilon
-  end function a2
-  function g(x,y)
-    use psb_base_mod, only : psb_dpk_, dzero, done
-    real(psb_dpk_) ::  g
+    a2_base=done*epsilon
+  end function a2_base
+  function g_base(x,y)
+    implicit none 
+    real(psb_dpk_) ::  g_base
    real(psb_dpk_), intent(in) :: x,y
-    g = dzero
+    g_base = dzero
    if (x == done) then
-      g = done
+      g_base = done
    else if (x == dzero) then
-      g = done
+      g_base = done
    end if
-  end function g
+  end function g_base
 end module amg_d_pde2d_base_mod
@@ -38,45 +38,45 @@ module amg_d_pde2d_box_mod
  use psb_base_mod, only : psb_dpk_, dzero, done
  real(psb_dpk_), save, private :: epsilon=done/80
 contains
-  subroutine pde_set_parm(dat)
+  subroutine pde_set_parm2d_box(dat)
    real(psb_dpk_), intent(in) :: dat
    epsilon = dat
-  end subroutine pde_set_parm
+  end subroutine pde_set_parm2d_box
  !
  ! functions parametrizing the differential equation
  !
  function b1_box(x,y)
-    use psb_base_mod, only : psb_dpk_, dzero, done
+    implicit none 
    real(psb_dpk_) :: b1_box
    real(psb_dpk_), intent(in) :: x,y
    b1_box = done/1.414_psb_dpk_
  end function b1_box
  function b2_box(x,y)
-    use psb_base_mod, only : psb_dpk_, dzero, done
+    implicit none 
    real(psb_dpk_) ::  b2_box
    real(psb_dpk_), intent(in) :: x,y
    b2_box = done/1.414_psb_dpk_
  end function b2_box
  function c_box(x,y)
-    use psb_base_mod, only : psb_dpk_, dzero, done
+    implicit none 
    real(psb_dpk_) ::  c_box
    real(psb_dpk_), intent(in) :: x,y
    c_box = dzero
  end function c_box
  function a1_box(x,y)
-    use psb_base_mod, only : psb_dpk_, dzero, done
+    implicit none 
    real(psb_dpk_) ::  a1_box
    real(psb_dpk_), intent(in) :: x,y
    a1_box=done*epsilon
  end function a1_box
  function a2_box(x,y)
-    use psb_base_mod, only : psb_dpk_, dzero, done
+    implicit none 
    real(psb_dpk_) ::  a2_box
    real(psb_dpk_), intent(in) :: x,y
    a2_box=done*epsilon
  end function a2_box
  function g_box(x,y)
-    use psb_base_mod, only : psb_dpk_, dzero, done
+    implicit none 
    real(psb_dpk_) ::  g_box
    real(psb_dpk_), intent(in) :: x,y
    g_box = dzero
@@ -38,45 +38,45 @@ module amg_d_pde2d_exp_mod
  use psb_base_mod, only : psb_dpk_, done, dzero
  real(psb_dpk_), save, private :: epsilon=done/80
 contains
-  subroutine pde_set_parm(dat)
+  subroutine pde_set_parm2d_exp(dat)
    real(psb_dpk_), intent(in) :: dat
    epsilon = dat
-  end subroutine pde_set_parm
+  end subroutine pde_set_parm2d_exp
  !
  ! functions parametrizing the differential equation
  !
  function b1_exp(x,y)
-    use psb_base_mod, only : psb_dpk_, done, dzero
+    implicit none 
    real(psb_dpk_) :: b1_exp
    real(psb_dpk_), intent(in) :: x,y
    b1_exp = dzero
  end function b1_exp
  function b2_exp(x,y)
-    use psb_base_mod, only : psb_dpk_, done, dzero
+    implicit none 
    real(psb_dpk_) ::  b2_exp
    real(psb_dpk_), intent(in) :: x,y
    b2_exp = dzero
  end function b2_exp
  function c_exp(x,y)
-    use psb_base_mod, only : psb_dpk_, done, dzero
+    implicit none 
    real(psb_dpk_) ::  c_exp
    real(psb_dpk_), intent(in) :: x,y
    c_exp = dzero
  end function c_exp
  function a1_exp(x,y)
-    use psb_base_mod, only : psb_dpk_, done, dzero
+    implicit none 
    real(psb_dpk_) ::  a1_exp
    real(psb_dpk_), intent(in) :: x,y
-    a1=done*epsilon*exp(-(x+y))
+    a1_exp=done*epsilon*exp(-(x+y))
  end function a1_exp
  function a2_exp(x,y)
-    use psb_base_mod, only : psb_dpk_, done, dzero
+    implicit none 
    real(psb_dpk_) ::  a2_exp
    real(psb_dpk_), intent(in) :: x,y
-    a2=done*epsilon*exp(-(x+y))
+    a2_exp=done*epsilon*exp(-(x+y))
  end function a2_exp
  function g_exp(x,y)
-    use psb_base_mod, only : psb_dpk_, done, dzero
+    implicit none 
    real(psb_dpk_) ::  g_exp
    real(psb_dpk_), intent(in) :: x,y
    g_exp = dzero
@@ -0,0 +1,89 @@
+!
+!
+!                             AMG4PSBLAS version 1.0
+!    Algebraic Multigrid Package
+!               based on PSBLAS (Parallel Sparse BLAS version 3.7)
+!
+!    (C) Copyright 2021
+!
+!        Salvatore Filippone
+!        Pasqua D'Ambra
+!        Fabio Durastante
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+module amg_d_pde2d_gauss_mod
+  use psb_base_mod, only : psb_dpk_, done, dzero
+  real(psb_dpk_), save, private :: epsilon=done/80
+contains
+  subroutine pde_set_parm2d_gauss(dat)
+    real(psb_dpk_), intent(in) :: dat
+    epsilon = dat
+  end subroutine pde_set_parm2d_gauss
+  !
+  ! functions parametrizing the differential equation
+  !
+  function b1_gauss(x,y)
+    implicit none 
+    real(psb_dpk_) :: b1_gauss
+    real(psb_dpk_), intent(in) :: x,y
+    b1_gauss=done/sqrt(3.0_psb_dpk_)-2*x*exp(-(x**2+y**2))
+  end function b1_gauss
+  function b2_gauss(x,y)
+    implicit none 
+    real(psb_dpk_) ::  b2_gauss
+    real(psb_dpk_), intent(in) :: x,y
+    b2_gauss=done/sqrt(3.0_psb_dpk_)-2*y*exp(-(x**2+y**2))
+  end function b2_gauss
+  function c_gauss(x,y)
+    implicit none 
+    real(psb_dpk_) ::  c_gauss
+    real(psb_dpk_), intent(in) :: x,y
+    c_gauss=dzero
+  end function c_gauss
+  function a1_gauss(x,y)
+    implicit none 
+    real(psb_dpk_) ::  a1_gauss
+    real(psb_dpk_), intent(in) :: x,y
+    a1_gauss=epsilon*exp(-(x**2+y**2))
+  end function a1_gauss
+  function a2_gauss(x,y)
+    implicit none 
+    real(psb_dpk_) ::  a2_gauss
+    real(psb_dpk_), intent(in) :: x,y
+    a2_gauss=epsilon*exp(-(x**2+y**2))
+  end function a2_gauss
+  function g_gauss(x,y)
+    implicit none 
+    real(psb_dpk_) ::  g_gauss
+    real(psb_dpk_), intent(in) :: x,y
+    g_gauss = dzero
+    if (x == done) then
+      g_gauss = done
+    else if (x == dzero) then
+      g_gauss = done
+    end if
+  end function g_gauss
+end module amg_d_pde2d_gauss_mod
@@ -72,6 +72,7 @@ program amg_d_pde3d
  use data_input
  use amg_d_pde3d_base_mod
  use amg_d_pde3d_exp_mod
+  use amg_d_pde3d_box_mod
  use amg_d_pde3d_gauss_mod
  use amg_d_genpde_mod
 #if defined(OPENMP)
@@ -125,63 +126,65 @@ program amg_d_pde3d
    integer(psb_ipk_)  :: outer_sweeps ! number of outer sweeps: sweeps for 1-level,
    ! AMG cycles for ML
    ! general AMG data
-    character(len=16)  :: mlcycle      ! AMG cycle type
-    integer(psb_ipk_)  :: maxlevs     ! maximum number of levels in AMG preconditioner
+    character(len=32)  :: mlcycle      ! AMG cycle type
+    integer(psb_ipk_)  :: maxlevs      ! maximum number of levels in AMG preconditioner

    ! AMG aggregation
-    character(len=16)  :: aggr_prol    ! aggregation type: SMOOTHED, NONSMOOTHED
-    character(len=16)  :: par_aggr_alg ! parallel aggregation algorithm: DEC, SYMDEC
-    character(len=16)  :: aggr_type   ! Type of aggregation SOC1, SOC2, MATCHBOXP
-    integer(psb_ipk_)  :: aggr_size   ! Requested size of the aggregates for MATCHBOXP
-    character(len=16)  :: aggr_ord    ! ordering for aggregation: NATURAL, DEGREE
-    character(len=16)  :: aggr_filter ! filtering: FILTER, NO_FILTER
-    real(psb_dpk_)     :: mncrratio  ! minimum aggregation ratio
+    character(len=32)  :: aggr_prol    ! aggregation type: SMOOTHED, NONSMOOTHED
+    character(len=32)  :: par_aggr_alg ! parallel aggregation algorithm: DEC, SYMDEC
+    character(len=32)  :: aggr_type    ! Type of aggregation SOC1, SOC2, MATCHBOXP
+    integer(psb_ipk_)  :: aggr_size    ! Requested size of the aggregates for MATCHBOXP
+    character(len=32)  :: aggr_ord     ! ordering for aggregation: NATURAL, DEGREE
+    character(len=32)  :: aggr_filter  ! filtering: FILTER, NO_FILTER
+    real(psb_dpk_)      :: mncrratio    ! minimum aggregation ratio
    real(psb_dpk_), allocatable :: athresv(:) ! smoothed aggregation threshold vector
-    integer(psb_ipk_)  :: thrvsz      ! size of threshold vector
-    real(psb_dpk_)     :: athres      ! smoothed aggregation threshold
-    integer(psb_ipk_)  :: csizepp     ! minimum size of coarsest matrix per process
+    integer(psb_ipk_)  :: thrvsz       ! size of threshold vector
+    real(psb_dpk_)      :: athres       ! smoothed aggregation threshold
+    integer(psb_ipk_)  :: csizepp      ! minimum size of coarsest matrix per process

    ! AMG smoother or pre-smoother; also 1-lev preconditioner
-    character(len=16)  :: smther      ! (pre-)smoother type: BJAC, AS
-    integer(psb_ipk_)  :: jsweeps     ! (pre-)smoother / 1-lev prec. sweeps
-    integer(psb_ipk_)  :: novr        ! number of overlap layers
-    character(len=16)  :: restr       ! restriction over application of AS
-    character(len=16)  :: prol        ! prolongation over application of AS
-    character(len=16)  :: solve       ! local subsolver type: ILU, MILU, ILUT,
-                                      ! UMF, MUMPS, SLU, FWGS, BWGS, JAC
-    character(len=16)  :: variant     ! AINV variant: LLK, etc
-    integer(psb_ipk_)  :: fill        ! fill-in for incomplete LU factorization
-    integer(psb_ipk_)  :: invfill     ! Inverse fill-in for INVK
-    real(psb_dpk_)     :: thr         ! threshold for ILUT factorization
+    character(len=32)  :: smther       ! (pre-)smoother type: BJAC, AS
+    integer(psb_ipk_)  :: jsweeps      ! (pre-)smoother / 1-lev prec. sweeps
+    integer(psb_ipk_)  :: novr         ! number of overlap layers
+    character(len=32)  :: restr        ! restriction over application of AS
+    character(len=32)  :: prol         ! prolongation over application of AS
+    character(len=32)  :: solve        ! local subsolver type: ILU, MILU, ILUT,
+                                       ! UMF, MUMPS, SLU, FWGS, BWGS, JAC
+    integer(psb_ipk_)  :: ssweeps      ! inner solver sweeps
+    character(len=32)  :: variant      ! AINV variant: LLK, etc
+    integer(psb_ipk_)  :: fill         ! fill-in for incomplete LU factorization
+    integer(psb_ipk_)  :: invfill      ! Inverse fill-in for INVK
+    real(psb_dpk_)      :: thr          ! threshold for ILUT factorization

    ! AMG post-smoother; ignored by 1-lev preconditioner
-    character(len=16)  :: smther2     ! post-smoother type: BJAC, AS
-    integer(psb_ipk_)  :: jsweeps2    ! post-smoother sweeps
-    integer(psb_ipk_)  :: novr2       ! number of overlap layers
-    character(len=16)  :: restr2      ! restriction  over application of AS
-    character(len=16)  :: prol2       ! prolongation over application of AS
-    character(len=16)  :: solve2      ! local subsolver type: ILU, MILU, ILUT,
-                                      ! UMF, MUMPS, SLU, FWGS, BWGS, JAC
-    character(len=16)  :: variant2    ! AINV variant: LLK, etc
-    integer(psb_ipk_)  :: fill2       ! fill-in for incomplete LU factorization
-    integer(psb_ipk_)  :: invfill2    ! Inverse fill-in for INVK
-    real(psb_dpk_)      :: thr2        ! threshold for ILUT factorization
+    character(len=32)  :: smther2      ! post-smoother type: BJAC, AS
+    integer(psb_ipk_)  :: jsweeps2     ! post-smoother sweeps
+    integer(psb_ipk_)  :: novr2        ! number of overlap layers
+    character(len=32)  :: restr2       ! restriction  over application of AS
+    character(len=32)  :: prol2        ! prolongation over application of AS
+    character(len=32)  :: solve2       ! local subsolver type: ILU, MILU, ILUT,
+                                       ! UMF, MUMPS, SLU, FWGS, BWGS, JAC
+    integer(psb_ipk_)  :: ssweeps2     ! inner solver sweeps
+    character(len=32)  :: variant2     ! AINV variant: LLK, etc
+    integer(psb_ipk_)  :: fill2        ! fill-in for incomplete LU factorization
+    integer(psb_ipk_)  :: invfill2     ! Inverse fill-in for INVK
+    real(psb_dpk_)      :: thr2         ! threshold for ILUT factorization

    ! coarsest-level solver
-    character(len=16)  :: cmat        ! coarsest matrix layout: REPL, DIST
-    character(len=16)  :: csolve      ! coarsest-lev solver: BJAC, SLUDIST (distr.
-                                      ! mat.); UMF, MUMPS, SLU, ILU, ILUT, MILU
-                                      ! (repl. mat.)
-    character(len=16)  :: csbsolve    ! coarsest-lev local subsolver: ILU, ILUT,
-                                      ! MILU, UMF, MUMPS, SLU
-    integer(psb_ipk_)  :: cfill       ! fill-in for incomplete LU factorization
-    real(psb_dpk_)     :: cthres      ! threshold for ILUT factorization
-    integer(psb_ipk_)  :: cjswp       ! sweeps for GS or JAC coarsest-lev subsolver
+    character(len=32)  :: cmat         ! coarsest matrix layout: REPL, DIST
+    character(len=32)  :: csolve       ! coarsest-lev solver: BJAC, SLUDIST (distr.
+                                       ! mat.); UMF, MUMPS, SLU, ILU, ILUT, MILU
+                                       ! (repl. mat.)
+    character(len=32)  :: csbsolve     ! coarsest-lev local subsolver: ILU, ILUT,
+                                       ! MILU, UMF, MUMPS, SLU
+    integer(psb_ipk_)  :: cfill        ! fill-in for incomplete LU factorization
+    real(psb_dpk_)     :: cthres        ! threshold for ILUT factorization
+    integer(psb_ipk_)  :: cjswp        ! sweeps for GS or JAC coarsest-lev subsolver

    ! Dump data
    logical            :: dump = .false.
-    integer(psb_ipk_)  :: dlmin       ! Minimum level to dump 
-    integer(psb_ipk_)  :: dlmax       ! Maximum level to dump
+    integer(psb_ipk_)  :: dlmin        ! Minimum level to dump 
+    integer(psb_ipk_)  :: dlmax        ! Maximum level to dump
    logical            :: dump_ac         = .false.
    logical            :: dump_rp         = .false.
    logical            :: dump_tprol      = .false.
@@ -241,10 +244,13 @@ program amg_d_pde3d
  select case(psb_toupper(trim(pdecoeff)))
  case("CONST")
    call amg_gen_pde3d(ctxt,idim,a,b,x,desc_a,afmt,&
-        & a1,a2,a3,b1,b2,b3,c,g,info)
+        & a1_base,a2_base,a3_base,b1_base,b2_base,b3_base,c_base,g_base,info)
  case("EXP")
    call amg_gen_pde3d(ctxt,idim,a,b,x,desc_a,afmt,&
        & a1_exp,a2_exp,a3_exp,b1_exp,b2_exp,b3_exp,c_exp,g_exp,info)
+  case("BOX")
+    call amg_gen_pde3d(ctxt,idim,a,b,x,desc_a,afmt,&
+        & a1_box,a2_box,a3_box,b1_box,b2_box,b3_box,c_box,g_box,info)
  case("GAUSS")
    call amg_gen_pde3d(ctxt,idim,a,b,x,desc_a,afmt,&
        & a1_gauss,a2_gauss,a3_gauss,b1_gauss,b2_gauss,b3_gauss,c_gauss,g_gauss,info)
@@ -286,10 +292,9 @@ program amg_d_pde3d
  case ('BJAC')
    call prec%set('smoother_sweeps', p_choice%jsweeps, info)
    call prec%set('sub_solve',       p_choice%solve,   info)
+    call prec%set('solver_sweeps',   p_choice%ssweeps,   info)
    if (psb_toupper(p_choice%solve)=='MUMPS') &
         & call prec%set('mumps_loc_glob','local_solver',info)
-    if ((psb_toupper(p_choice%solve)=='JACOBI').or.(psb_toupper(p_choice%solve)=='L1-JACOBI')) &
-         & call prec%set('solver_sweeps',8,info)
    call prec%set('sub_fillin',      p_choice%fill,    info)
    call prec%set('sub_iluthrs',     p_choice%thr,     info)

@@ -299,6 +304,7 @@ program amg_d_pde3d
    call prec%set('sub_restr',       p_choice%restr,   info)
    call prec%set('sub_prol',        p_choice%prol,    info)
    call prec%set('sub_solve',       p_choice%solve,   info)
+    call prec%set('solver_sweeps',   p_choice%ssweeps,   info)
    if (psb_toupper(p_choice%solve)=='MUMPS') &
         & call prec%set('mumps_loc_glob','local_solver',info)
    call prec%set('sub_fillin',      p_choice%fill,    info)
@@ -355,7 +361,7 @@ program amg_d_pde3d
        if (psb_toupper(p_choice%solve)=='MUMPS') &
             & call prec%set('mumps_loc_glob','local_solver',info)
      end select
-
+      call prec%set('solver_sweeps',   p_choice%ssweeps,   info)
      call prec%set('sub_fillin',      p_choice%fill,       info)
      call prec%set('inv_fillin',      p_choice%invfill,    info)
      call prec%set('sub_iluthrs',     p_choice%thr,        info)
@@ -384,7 +390,7 @@ program amg_d_pde3d
          if (psb_toupper(p_choice%solve2)=='MUMPS') &
               & call prec%set('mumps_loc_glob','local_solver',info)
        end select
-
+        call prec%set('solver_sweeps',   p_choice%ssweeps2,   info,pos='post')
        call prec%set('sub_fillin',      p_choice%fill2,     info,pos='post')
        call prec%set('inv_fillin',      p_choice%invfill2,  info,pos='post')
        call prec%set('sub_iluthrs',     p_choice%thr2,      info,pos='post')
@@ -502,7 +508,7 @@ program amg_d_pde3d
    write(psb_out_unit,'("Storage format for DESC_A          : ",a  )') desc_a%get_fmt()

  end if
-  call psb_print_timers(ctxt)
+
  !
  !  cleanup storage and exit
  !
@@ -583,6 +589,7 @@ contains
      call read_data(prec%restr,inp_unit)      ! restriction  over application of AS
      call read_data(prec%prol,inp_unit)       ! prolongation over application of AS
      call read_data(prec%solve,inp_unit)      ! local subsolver
+      call read_data(prec%ssweeps,inp_unit)    ! inner solver sweeps 
      call read_data(prec%variant,inp_unit)    ! AINV variant
      call read_data(prec%fill,inp_unit)       ! fill-in for incomplete LU
      call read_data(prec%invfill,inp_unit)    !Inverse fill-in for INVK
@@ -594,6 +601,7 @@ contains
      call read_data(prec%restr2,inp_unit)      ! restriction  over application of AS
      call read_data(prec%prol2,inp_unit)       ! prolongation over application of AS
      call read_data(prec%solve2,inp_unit)      ! local subsolver
+      call read_data(prec%ssweeps2,inp_unit)    ! inner solver sweeps 
      call read_data(prec%variant2,inp_unit)    ! AINV variant
      call read_data(prec%fill2,inp_unit)       ! fill-in for incomplete LU
      call read_data(prec%invfill2,inp_unit)    !Inverse fill-in for INVK
@@ -663,6 +671,7 @@ contains
    call psb_bcast(ctxt,prec%restr)
    call psb_bcast(ctxt,prec%prol)
    call psb_bcast(ctxt,prec%solve)
+    call psb_bcast(ctxt,prec%ssweeps)
    call psb_bcast(ctxt,prec%variant)
    call psb_bcast(ctxt,prec%fill)
    call psb_bcast(ctxt,prec%invfill)
@@ -674,6 +683,7 @@ contains
    call psb_bcast(ctxt,prec%restr2)
    call psb_bcast(ctxt,prec%prol2)
    call psb_bcast(ctxt,prec%solve2)
+    call psb_bcast(ctxt,prec%ssweeps2)
    call psb_bcast(ctxt,prec%variant2)
    call psb_bcast(ctxt,prec%fill2)
    call psb_bcast(ctxt,prec%invfill2)
@@ -35,67 +35,67 @@
 !    POSSIBILITY OF SUCH DAMAGE.
 !
 module amg_d_pde3d_base_mod
-  use psb_base_mod, only : psb_dpk_, done
+  use psb_base_mod, only : psb_dpk_, done, dzero
  real(psb_dpk_), save, private :: epsilon=done/80
 contains
-  subroutine pde_set_parm(dat)
+  subroutine pde_set_parm3d_base(dat)
    real(psb_dpk_), intent(in) :: dat
    epsilon = dat
-  end subroutine pde_set_parm
+  end subroutine pde_set_parm3d_base
  !
  ! functions parametrizing the differential equation
  !
-  function b1(x,y,z)
-    use psb_base_mod, only : psb_dpk_, done
-    real(psb_dpk_) :: b1
+  function b1_base(x,y,z)
+    implicit none 
+    real(psb_dpk_) :: b1_base
    real(psb_dpk_), intent(in) :: x,y,z
-    b1=done/sqrt(3.0_psb_dpk_)
-  end function b1
-  function b2(x,y,z)
-    use psb_base_mod, only : psb_dpk_, done
-    real(psb_dpk_) ::  b2
+    b1_base=dzero/sqrt(3.0_psb_dpk_)
+  end function b1_base
+  function b2_base(x,y,z)
+    implicit none 
+    real(psb_dpk_) ::  b2_base
    real(psb_dpk_), intent(in) :: x,y,z
-    b2=done/sqrt(3.0_psb_dpk_)
-  end function b2
-  function b3(x,y,z)
-    use psb_base_mod, only : psb_dpk_, done
-    real(psb_dpk_) ::  b3
+    b2_base=dzero/sqrt(3.0_psb_dpk_)
+  end function b2_base
+  function b3_base(x,y,z)
+    implicit none 
+    real(psb_dpk_) ::  b3_base
    real(psb_dpk_), intent(in) :: x,y,z
-    b3=done/sqrt(3.0_psb_dpk_)
-  end function b3
-  function c(x,y,z)
-    use psb_base_mod, only : psb_dpk_, dzero, done
-    real(psb_dpk_) ::  c
+    b3_base=dzero/sqrt(3.0_psb_dpk_)
+  end function b3_base
+  function c_base(x,y,z)
+    implicit none 
+    real(psb_dpk_) ::  c_base
    real(psb_dpk_), intent(in) :: x,y,z
-    c=dzero
-  end function c
-  function a1(x,y,z)
-    use psb_base_mod, only : psb_dpk_
-    real(psb_dpk_) ::  a1
+    c_base=dzero
+  end function c_base
+  function a1_base(x,y,z)
+    implicit none 
+    real(psb_dpk_) ::  a1_base
    real(psb_dpk_), intent(in) :: x,y,z
-    a1=epsilon
-  end function a1
-  function a2(x,y,z)
-    use psb_base_mod, only : psb_dpk_
-    real(psb_dpk_) ::  a2
+    a1_base=epsilon
+  end function a1_base
+  function a2_base(x,y,z)
+    implicit none 
+    real(psb_dpk_) ::  a2_base
    real(psb_dpk_), intent(in) :: x,y,z
-    a2=epsilon
-  end function a2
-  function a3(x,y,z)
-    use psb_base_mod, only : psb_dpk_
-    real(psb_dpk_) ::  a3
+    a2_base=epsilon
+  end function a2_base
+  function a3_base(x,y,z)
+    implicit none 
+    real(psb_dpk_) ::  a3_base
    real(psb_dpk_), intent(in) :: x,y,z
-    a3=epsilon
-  end function a3
-  function g(x,y,z)
-    use psb_base_mod, only : psb_dpk_, done, dzero
-    real(psb_dpk_) ::  g
+    a3_base=epsilon
+  end function a3_base
+  function g_base(x,y,z)
+    implicit none 
+    real(psb_dpk_) ::  g_base
    real(psb_dpk_), intent(in) :: x,y,z
-    g = dzero
+    g_base = dzero
    if (x == done) then
-      g = done
+      g_base = done
    else if (x == dzero) then
-      g = done
+      g_base = done
    end if
-  end function g
+  end function g_base
 end module amg_d_pde3d_base_mod
@@ -0,0 +1,101 @@
+!
+!
+!                             AMG4PSBLAS version 1.0
+!    Algebraic Multigrid Package
+!               based on PSBLAS (Parallel Sparse BLAS version 3.7)
+!
+!    (C) Copyright 2021
+!
+!        Salvatore Filippone
+!        Pasqua D'Ambra
+!        Fabio Durastante
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+module amg_d_pde3d_box_mod
+  use psb_base_mod, only : psb_dpk_, done, dzero
+  real(psb_dpk_), save, private :: epsilon=done/80
+contains
+  subroutine pde_set_parm3d_box(dat)
+    real(psb_dpk_), intent(in) :: dat
+    epsilon = dat
+  end subroutine pde_set_parm3d_box
+  !
+  ! functions parametrizing the differential equation
+  !
+  function b1_box(x,y,z)
+    implicit none 
+    real(psb_dpk_) :: b1_box
+    real(psb_dpk_), intent(in) :: x,y,z
+    b1_box=done/sqrt(3.0_psb_dpk_)
+  end function b1_box
+  function b2_box(x,y,z)
+    implicit none 
+    real(psb_dpk_) ::  b2_box
+    real(psb_dpk_), intent(in) :: x,y,z
+    b2_box=done/sqrt(3.0_psb_dpk_)
+  end function b2_box
+  function b3_box(x,y,z)
+    implicit none 
+    real(psb_dpk_) ::  b3_box
+    real(psb_dpk_), intent(in) :: x,y,z
+    b3_box=done/sqrt(3.0_psb_dpk_)
+  end function b3_box
+  function c_box(x,y,z)
+    implicit none 
+    real(psb_dpk_) ::  c_box
+    real(psb_dpk_), intent(in) :: x,y,z
+    c_box=dzero
+  end function c_box
+  function a1_box(x,y,z)
+    implicit none 
+    real(psb_dpk_) ::  a1_box
+    real(psb_dpk_), intent(in) :: x,y,z
+    a1_box=epsilon
+  end function a1_box
+  function a2_box(x,y,z)
+    implicit none 
+    real(psb_dpk_) ::  a2_box
+    real(psb_dpk_), intent(in) :: x,y,z
+    a2_box=epsilon
+  end function a2_box
+  function a3_box(x,y,z)
+    implicit none 
+    real(psb_dpk_) ::  a3_box
+    real(psb_dpk_), intent(in) :: x,y,z
+    a3_box=epsilon
+  end function a3_box
+  function g_box(x,y,z)
+    implicit none 
+    real(psb_dpk_) ::  g_box
+    real(psb_dpk_), intent(in) :: x,y,z
+    g_box= dzero
+    if (x == done) then
+      g_box = done
+    else if (x == dzero) then
+      g_box = done
+    end if
+  end function g_box
+end module amg_d_pde3d_box_mod
@@ -35,60 +35,60 @@
 !    POSSIBILITY OF SUCH DAMAGE.
 !
 module amg_d_pde3d_exp_mod
-  use psb_base_mod, only : psb_dpk_, done
+  use psb_base_mod, only : psb_dpk_, done, dzero
  real(psb_dpk_), save, private :: epsilon=done/160
 contains
-  subroutine pde_set_parm(dat)
+  subroutine pde_set_parm3d_exp(dat)
    real(psb_dpk_), intent(in) :: dat
    epsilon = dat
-  end subroutine pde_set_parm
+  end subroutine pde_set_parm3d_exp
  !
  ! functions parametrizing the differential equation
  !
  function b1_exp(x,y,z)
-    use psb_base_mod, only : psb_dpk_, dzero
+    implicit none 
    real(psb_dpk_) :: b1_exp
    real(psb_dpk_), intent(in) :: x,y,z
    b1_exp=dzero/sqrt(3.0_psb_dpk_)
  end function b1_exp
  function b2_exp(x,y,z)
-    use psb_base_mod, only : psb_dpk_, dzero
+    implicit none 
    real(psb_dpk_) ::  b2_exp
    real(psb_dpk_), intent(in) :: x,y,z
    b2_exp=dzero/sqrt(3.0_psb_dpk_)
  end function b2_exp
  function b3_exp(x,y,z)
-    use psb_base_mod, only : psb_dpk_, dzero
+    implicit none 
    real(psb_dpk_) ::  b3_exp
    real(psb_dpk_), intent(in) :: x,y,z
    b3_exp=dzero/sqrt(3.0_psb_dpk_)
  end function b3_exp
  function c_exp(x,y,z)
-    use psb_base_mod, only : psb_dpk_, dzero
+    implicit none 
    real(psb_dpk_) ::  c_exp
    real(psb_dpk_), intent(in) :: x,y,z
    c_exp=dzero
  end function c_exp
  function a1_exp(x,y,z)
-    use psb_base_mod, only : psb_dpk_
+    implicit none 
    real(psb_dpk_) ::  a1_exp
    real(psb_dpk_), intent(in) :: x,y,z
    a1_exp=epsilon*exp(-(x+y+z))
  end function a1_exp
  function a2_exp(x,y,z)
-    use psb_base_mod, only : psb_dpk_
+    implicit none 
    real(psb_dpk_) ::  a2_exp
    real(psb_dpk_), intent(in) :: x,y,z
    a2_exp=epsilon*exp(-(x+y+z))
  end function a2_exp
  function a3_exp(x,y,z)
-    use psb_base_mod, only : psb_dpk_
+    implicit none 
    real(psb_dpk_) ::  a3_exp
    real(psb_dpk_), intent(in) :: x,y,z
    a3_exp=epsilon*exp(-(x+y+z))
  end function a3_exp
  function g_exp(x,y,z)
-    use psb_base_mod, only : psb_dpk_, done, dzero
+    implicit none 
    real(psb_dpk_) ::  g_exp
    real(psb_dpk_), intent(in) :: x,y,z
    g_exp = dzero
@@ -35,60 +35,60 @@
 !    POSSIBILITY OF SUCH DAMAGE.
 !
 module amg_d_pde3d_gauss_mod
-  use psb_base_mod, only : psb_dpk_, done
+  use psb_base_mod, only : psb_dpk_, done, dzero
  real(psb_dpk_), save, private :: epsilon=done/80
 contains
-  subroutine pde_set_parm(dat)
+  subroutine pde_set_parm3d_gauss(dat)
    real(psb_dpk_), intent(in) :: dat
    epsilon = dat
-  end subroutine pde_set_parm
+  end subroutine pde_set_parm3d_gauss
  !
  ! functions parametrizing the differential equation
  !
  function b1_gauss(x,y,z)
-    use psb_base_mod, only : psb_dpk_, done
+    implicit none 
    real(psb_dpk_) :: b1_gauss
    real(psb_dpk_), intent(in) :: x,y,z
    b1_gauss=done/sqrt(3.0_psb_dpk_)-2*x*exp(-(x**2+y**2+z**2))
  end function b1_gauss
  function b2_gauss(x,y,z)
-    use psb_base_mod, only : psb_dpk_, done
+    implicit none 
    real(psb_dpk_) ::  b2_gauss
    real(psb_dpk_), intent(in) :: x,y,z
    b2_gauss=done/sqrt(3.0_psb_dpk_)-2*y*exp(-(x**2+y**2+z**2))
  end function b2_gauss
  function b3_gauss(x,y,z)
-    use psb_base_mod, only : psb_dpk_, done
+    implicit none 
    real(psb_dpk_) ::  b3_gauss
    real(psb_dpk_), intent(in) :: x,y,z
    b3_gauss=done/sqrt(3.0_psb_dpk_)-2*z*exp(-(x**2+y**2+z**2))
  end function b3_gauss
  function c_gauss(x,y,z)
-    use psb_base_mod, only : psb_dpk_, dzero
+    implicit none 
    real(psb_dpk_) ::  c_gauss
    real(psb_dpk_), intent(in) :: x,y,z
-    c=dzero
+    c_gauss=dzero
  end function c_gauss
  function a1_gauss(x,y,z)
-    use psb_base_mod, only : psb_dpk_
+    implicit none 
    real(psb_dpk_) ::  a1_gauss
    real(psb_dpk_), intent(in) :: x,y,z
    a1_gauss=epsilon*exp(-(x**2+y**2+z**2))
  end function a1_gauss
  function a2_gauss(x,y,z)
-    use psb_base_mod, only : psb_dpk_
+    implicit none 
    real(psb_dpk_) ::  a2_gauss
    real(psb_dpk_), intent(in) :: x,y,z
    a2_gauss=epsilon*exp(-(x**2+y**2+z**2))
  end function a2_gauss
  function a3_gauss(x,y,z)
-    use psb_base_mod, only : psb_dpk_
+    implicit none 
    real(psb_dpk_) ::  a3_gauss
    real(psb_dpk_), intent(in) :: x,y,z
    a3_gauss=epsilon*exp(-(x**2+y**2+z**2))
  end function a3_gauss
  function g_gauss(x,y,z)
-    use psb_base_mod, only : psb_dpk_, done, dzero
+    implicit none 
    real(psb_dpk_) ::  g_gauss
    real(psb_dpk_), intent(in) :: x,y,z
    g_gauss = dzero
@@ -72,6 +72,7 @@ program amg_s_pde2d
  use amg_s_pde2d_base_mod
  use amg_s_pde2d_exp_mod
  use amg_s_pde2d_box_mod
+  use amg_s_pde2d_gauss_mod
  use amg_s_genpde_mod
 #if defined(OPENMP)
  use omp_lib
@@ -124,16 +125,16 @@ program amg_s_pde2d
    integer(psb_ipk_)  :: outer_sweeps ! number of outer sweeps: sweeps for 1-level,
    ! AMG cycles for ML
    ! general AMG data
-    character(len=16)  :: mlcycle      ! AMG cycle type
+    character(len=32)  :: mlcycle      ! AMG cycle type
    integer(psb_ipk_)  :: maxlevs     ! maximum number of levels in AMG preconditioner

    ! AMG aggregation
-    character(len=16)  :: aggr_prol    ! aggregation type: SMOOTHED, NONSMOOTHED
-    character(len=16)  :: par_aggr_alg ! parallel aggregation algorithm: DEC, SYMDEC
-    character(len=16)  :: aggr_type   ! Type of aggregation SOC1, SOC2, MATCHBOXP
+    character(len=32)  :: aggr_prol    ! aggregation type: SMOOTHED, NONSMOOTHED
+    character(len=32)  :: par_aggr_alg ! parallel aggregation algorithm: DEC, SYMDEC
+    character(len=32)  :: aggr_type   ! Type of aggregation SOC1, SOC2, MATCHBOXP
    integer(psb_ipk_)  :: aggr_size   ! Requested size of the aggregates for MATCHBOXP
-    character(len=16)  :: aggr_ord    ! ordering for aggregation: NATURAL, DEGREE
-    character(len=16)  :: aggr_filter ! filtering: FILTER, NO_FILTER
+    character(len=32)  :: aggr_ord    ! ordering for aggregation: NATURAL, DEGREE
+    character(len=32)  :: aggr_filter ! filtering: FILTER, NO_FILTER
    real(psb_spk_)     :: mncrratio  ! minimum aggregation ratio
    real(psb_spk_), allocatable :: athresv(:) ! smoothed aggregation threshold vector
    integer(psb_ipk_)  :: thrvsz      ! size of threshold vector
@@ -141,37 +142,39 @@ program amg_s_pde2d
    integer(psb_ipk_)  :: csizepp     ! minimum size of coarsest matrix per process

    ! AMG smoother or pre-smoother; also 1-lev preconditioner
-    character(len=16)  :: smther      ! (pre-)smoother type: BJAC, AS
-    integer(psb_ipk_)  :: jsweeps     ! (pre-)smoother / 1-lev prec. sweeps
-    integer(psb_ipk_)  :: novr        ! number of overlap layers
-    character(len=16)  :: restr       ! restriction over application of AS
-    character(len=16)  :: prol        ! prolongation over application of AS
-    character(len=16)  :: solve       ! local subsolver type: ILU, MILU, ILUT,
-                                      ! UMF, MUMPS, SLU, FWGS, BWGS, JAC
-    character(len=16)  :: variant     ! AINV variant: LLK, etc
-    integer(psb_ipk_)  :: fill        ! fill-in for incomplete LU factorization
-    integer(psb_ipk_)  :: invfill     ! Inverse fill-in for INVK
-    real(psb_spk_)     :: thr         ! threshold for ILUT factorization
+    character(len=32)  :: smther       ! (pre-)smoother type: BJAC, AS
+    integer(psb_ipk_)  :: jsweeps      ! (pre-)smoother / 1-lev prec. sweeps
+    integer(psb_ipk_)  :: novr         ! number of overlap layers
+    character(len=32)  :: restr        ! restriction over application of AS
+    character(len=32)  :: prol         ! prolongation over application of AS
+    character(len=32)  :: solve        ! local subsolver type: ILU, MILU, ILUT,
+                                       ! UMF, MUMPS, SLU, FWGS, BWGS, JAC
+    integer(psb_ipk_)  :: ssweeps      ! inner solver sweeps
+    character(len=32)  :: variant      ! AINV variant: LLK, etc
+    integer(psb_ipk_)  :: fill         ! fill-in for incomplete LU factorization
+    integer(psb_ipk_)  :: invfill      ! Inverse fill-in for INVK
+    real(psb_spk_)      :: thr          ! threshold for ILUT factorization

    ! AMG post-smoother; ignored by 1-lev preconditioner
-    character(len=16)  :: smther2     ! post-smoother type: BJAC, AS
-    integer(psb_ipk_)  :: jsweeps2    ! post-smoother sweeps
-    integer(psb_ipk_)  :: novr2       ! number of overlap layers
-    character(len=16)  :: restr2      ! restriction  over application of AS
-    character(len=16)  :: prol2       ! prolongation over application of AS
-    character(len=16)  :: solve2      ! local subsolver type: ILU, MILU, ILUT,
-                                      ! UMF, MUMPS, SLU, FWGS, BWGS, JAC
-    character(len=16)  :: variant2    ! AINV variant: LLK, etc
-    integer(psb_ipk_)  :: fill2       ! fill-in for incomplete LU factorization
-    integer(psb_ipk_)  :: invfill2    ! Inverse fill-in for INVK
-    real(psb_spk_)      :: thr2        ! threshold for ILUT factorization
+    character(len=32)  :: smther2      ! post-smoother type: BJAC, AS
+    integer(psb_ipk_)  :: jsweeps2     ! post-smoother sweeps
+    integer(psb_ipk_)  :: novr2        ! number of overlap layers
+    character(len=32)  :: restr2       ! restriction  over application of AS
+    character(len=32)  :: prol2        ! prolongation over application of AS
+    character(len=32)  :: solve2       ! local subsolver type: ILU, MILU, ILUT,
+                                       ! UMF, MUMPS, SLU, FWGS, BWGS, JAC
+    integer(psb_ipk_)  :: ssweeps2     ! inner solver sweeps
+    character(len=32)  :: variant2     ! AINV variant: LLK, etc
+    integer(psb_ipk_)  :: fill2        ! fill-in for incomplete LU factorization
+    integer(psb_ipk_)  :: invfill2     ! Inverse fill-in for INVK
+    real(psb_spk_)      :: thr2         ! threshold for ILUT factorization

    ! coarsest-level solver
-    character(len=16)  :: cmat        ! coarsest matrix layout: REPL, DIST
-    character(len=16)  :: csolve      ! coarsest-lev solver: BJAC, SLUDIST (distr.
+    character(len=32)  :: cmat        ! coarsest matrix layout: REPL, DIST
+    character(len=32)  :: csolve      ! coarsest-lev solver: BJAC, SLUDIST (distr.
                                      ! mat.); UMF, MUMPS, SLU, ILU, ILUT, MILU
                                      ! (repl. mat.)
-    character(len=16)  :: csbsolve    ! coarsest-lev local subsolver: ILU, ILUT,
+    character(len=32)  :: csbsolve    ! coarsest-lev local subsolver: ILU, ILUT,
                                      ! MILU, UMF, MUMPS, SLU
    integer(psb_ipk_)  :: cfill       ! fill-in for incomplete LU factorization
    real(psb_spk_)     :: cthres      ! threshold for ILUT factorization
@@ -239,13 +242,16 @@ program amg_s_pde2d
  select case(psb_toupper(trim(pdecoeff)))
  case("CONST")
    call amg_gen_pde2d(ctxt,idim,a,b,x,desc_a,afmt,&
-        & a1,a2,b1,b2,c,g,info)
+        & a1_base,a2_base,b1_base,b2_base,c_base,g_base,info)
  case("EXP")
    call amg_gen_pde2d(ctxt,idim,a,b,x,desc_a,afmt,&
        & a1_exp,a2_exp,b1_exp,b2_exp,c_exp,g_exp,info)
  case("BOX")
    call amg_gen_pde2d(ctxt,idim,a,b,x,desc_a,afmt,&
        & a1_box,a2_box,b1_box,b2_box,c_box,g_box,info)
+  case("GAUSS")
+    call amg_gen_pde2d(ctxt,idim,a,b,x,desc_a,afmt,&
+        & a1_gauss,a2_gauss,b1_gauss,b2_gauss,c_gauss,g_gauss,info)
  case default
    info=psb_err_from_subroutine_
    ch_err='amg_gen_pdecoeff'
@@ -282,6 +288,7 @@ program amg_s_pde2d
  case ('BJAC')
    call prec%set('smoother_sweeps', p_choice%jsweeps, info)
    call prec%set('sub_solve',       p_choice%solve,   info)
+    call prec%set('solver_sweeps',   p_choice%ssweeps,   info)
    if (psb_toupper(p_choice%solve)=='MUMPS') &
         & call prec%set('mumps_loc_glob','local_solver',info)
    call prec%set('sub_fillin',      p_choice%fill,    info)
@@ -293,6 +300,7 @@ program amg_s_pde2d
    call prec%set('sub_restr',       p_choice%restr,   info)
    call prec%set('sub_prol',        p_choice%prol,    info)
    call prec%set('sub_solve',       p_choice%solve,   info)
+    call prec%set('solver_sweeps',   p_choice%ssweeps,   info)
    if (psb_toupper(p_choice%solve)=='MUMPS') &
         & call prec%set('mumps_loc_glob','local_solver',info)
    call prec%set('sub_fillin',      p_choice%fill,    info)
@@ -349,7 +357,7 @@ program amg_s_pde2d
        if (psb_toupper(p_choice%solve)=='MUMPS') &
             & call prec%set('mumps_loc_glob','local_solver',info)
      end select
-
+      call prec%set('solver_sweeps',   p_choice%ssweeps,   info)
      call prec%set('sub_fillin',      p_choice%fill,       info)
      call prec%set('inv_fillin',      p_choice%invfill,    info)
      call prec%set('sub_iluthrs',     p_choice%thr,        info)
@@ -378,7 +386,7 @@ program amg_s_pde2d
          if (psb_toupper(p_choice%solve2)=='MUMPS') &
               & call prec%set('mumps_loc_glob','local_solver',info)
        end select
-
+        call prec%set('solver_sweeps',   p_choice%ssweeps2,   info,pos='post')
        call prec%set('sub_fillin',      p_choice%fill2,     info,pos='post')
        call prec%set('inv_fillin',      p_choice%invfill2,  info,pos='post')
        call prec%set('sub_iluthrs',     p_choice%thr2,      info,pos='post')
@@ -577,6 +585,7 @@ contains
      call read_data(prec%restr,inp_unit)      ! restriction  over application of AS
      call read_data(prec%prol,inp_unit)       ! prolongation over application of AS
      call read_data(prec%solve,inp_unit)      ! local subsolver
+      call read_data(prec%ssweeps,inp_unit)    ! inner solver sweeps 
      call read_data(prec%variant,inp_unit)    ! AINV variant
      call read_data(prec%fill,inp_unit)       ! fill-in for incomplete LU
      call read_data(prec%invfill,inp_unit)    !Inverse fill-in for INVK
@@ -588,6 +597,7 @@ contains
      call read_data(prec%restr2,inp_unit)      ! restriction  over application of AS
      call read_data(prec%prol2,inp_unit)       ! prolongation over application of AS
      call read_data(prec%solve2,inp_unit)      ! local subsolver
+      call read_data(prec%ssweeps2,inp_unit)    ! inner solver sweeps 
      call read_data(prec%variant2,inp_unit)    ! AINV variant
      call read_data(prec%fill2,inp_unit)       ! fill-in for incomplete LU
      call read_data(prec%invfill2,inp_unit)    !Inverse fill-in for INVK
@@ -657,6 +667,7 @@ contains
    call psb_bcast(ctxt,prec%restr)
    call psb_bcast(ctxt,prec%prol)
    call psb_bcast(ctxt,prec%solve)
+    call psb_bcast(ctxt,prec%ssweeps)
    call psb_bcast(ctxt,prec%variant)
    call psb_bcast(ctxt,prec%fill)
    call psb_bcast(ctxt,prec%invfill)
@@ -668,6 +679,7 @@ contains
    call psb_bcast(ctxt,prec%restr2)
    call psb_bcast(ctxt,prec%prol2)
    call psb_bcast(ctxt,prec%solve2)
+    call psb_bcast(ctxt,prec%ssweeps2)
    call psb_bcast(ctxt,prec%variant2)
    call psb_bcast(ctxt,prec%fill2)
    call psb_bcast(ctxt,prec%invfill2)
@@ -38,52 +38,52 @@ module amg_s_pde2d_base_mod
  use psb_base_mod, only : psb_spk_, szero, sone
  real(psb_spk_), save, private :: epsilon=sone/80
 contains
-  subroutine pde_set_parm(dat)
+  subroutine pde_set_parm2d_base(dat)
    real(psb_spk_), intent(in) :: dat
    epsilon = dat
-  end subroutine pde_set_parm
+  end subroutine pde_set_parm2d_base
  !
  ! functions parametrizing the differential equation
  !
-  function b1(x,y)
-    use psb_base_mod, only : psb_spk_, szero, sone
-    real(psb_spk_) :: b1
+  function b1_base(x,y)
+    implicit none 
+    real(psb_spk_) :: b1_base
    real(psb_spk_), intent(in) :: x,y
-    b1 = szero/1.414_psb_spk_
-  end function b1
-  function b2(x,y)
-    use psb_base_mod, only : psb_spk_, szero, sone
-    real(psb_spk_) ::  b2
+    b1_base = szero/1.414_psb_spk_
+  end function b1_base
+  function b2_base(x,y)
+    implicit none 
+    real(psb_spk_) ::  b2_base
    real(psb_spk_), intent(in) :: x,y
-    b2 = szero/1.414_psb_spk_
-  end function b2
-  function c(x,y)
-    use psb_base_mod, only : psb_spk_, szero, sone
-    real(psb_spk_) ::  c
+    b2_base = szero/1.414_psb_spk_
+  end function b2_base
+  function c_base(x,y)
+    implicit none 
+    real(psb_spk_) ::  c_base
    real(psb_spk_), intent(in) :: x,y
-    c = szero
-  end function c
-  function a1(x,y)
-    use psb_base_mod, only : psb_spk_, szero, sone
-    real(psb_spk_) ::  a1
+    c_base = szero
+  end function c_base
+  function a1_base(x,y)
+    implicit none 
+    real(psb_spk_) ::  a1_base
    real(psb_spk_), intent(in) :: x,y
-    a1=sone*epsilon
-  end function a1
-  function a2(x,y)
-    use psb_base_mod, only : psb_spk_, szero, sone
-    real(psb_spk_) ::  a2
+    a1_base=sone*epsilon
+  end function a1_base
+  function a2_base(x,y)
+    implicit none 
+    real(psb_spk_) ::  a2_base
    real(psb_spk_), intent(in) :: x,y
-    a2=sone*epsilon
-  end function a2
-  function g(x,y)
-    use psb_base_mod, only : psb_spk_, szero, sone
-    real(psb_spk_) ::  g
+    a2_base=sone*epsilon
+  end function a2_base
+  function g_base(x,y)
+    implicit none 
+    real(psb_spk_) ::  g_base
    real(psb_spk_), intent(in) :: x,y
-    g = szero
+    g_base = szero
    if (x == sone) then
-      g = sone
+      g_base = sone
    else if (x == szero) then
-      g = sone
+      g_base = sone
    end if
-  end function g
+  end function g_base
 end module amg_s_pde2d_base_mod
@@ -38,45 +38,45 @@ module amg_s_pde2d_box_mod
  use psb_base_mod, only : psb_spk_, szero, sone
  real(psb_spk_), save, private :: epsilon=sone/80
 contains
-  subroutine pde_set_parm(dat)
+  subroutine pde_set_parm2d_box(dat)
    real(psb_spk_), intent(in) :: dat
    epsilon = dat
-  end subroutine pde_set_parm
+  end subroutine pde_set_parm2d_box
  !
  ! functions parametrizing the differential equation
  !
  function b1_box(x,y)
-    use psb_base_mod, only : psb_spk_, szero, sone
+    implicit none 
    real(psb_spk_) :: b1_box
    real(psb_spk_), intent(in) :: x,y
    b1_box = sone/1.414_psb_spk_
  end function b1_box
  function b2_box(x,y)
-    use psb_base_mod, only : psb_spk_, szero, sone
+    implicit none 
    real(psb_spk_) ::  b2_box
    real(psb_spk_), intent(in) :: x,y
    b2_box = sone/1.414_psb_spk_
  end function b2_box
  function c_box(x,y)
-    use psb_base_mod, only : psb_spk_, szero, sone
+    implicit none 
    real(psb_spk_) ::  c_box
    real(psb_spk_), intent(in) :: x,y
    c_box = szero
  end function c_box
  function a1_box(x,y)
-    use psb_base_mod, only : psb_spk_, szero, sone
+    implicit none 
    real(psb_spk_) ::  a1_box
    real(psb_spk_), intent(in) :: x,y
    a1_box=sone*epsilon
  end function a1_box
  function a2_box(x,y)
-    use psb_base_mod, only : psb_spk_, szero, sone
+    implicit none 
    real(psb_spk_) ::  a2_box
    real(psb_spk_), intent(in) :: x,y
    a2_box=sone*epsilon
  end function a2_box
  function g_box(x,y)
-    use psb_base_mod, only : psb_spk_, szero, sone
+    implicit none 
    real(psb_spk_) ::  g_box
    real(psb_spk_), intent(in) :: x,y
    g_box = szero
@@ -38,45 +38,45 @@ module amg_s_pde2d_exp_mod
  use psb_base_mod, only : psb_spk_, sone, szero
  real(psb_spk_), save, private :: epsilon=sone/80
 contains
-  subroutine pde_set_parm(dat)
+  subroutine pde_set_parm2d_exp(dat)
    real(psb_spk_), intent(in) :: dat
    epsilon = dat
-  end subroutine pde_set_parm
+  end subroutine pde_set_parm2d_exp
  !
  ! functions parametrizing the differential equation
  !
  function b1_exp(x,y)
-    use psb_base_mod, only : psb_spk_, sone, szero
+    implicit none 
    real(psb_spk_) :: b1_exp
    real(psb_spk_), intent(in) :: x,y
    b1_exp = szero
  end function b1_exp
  function b2_exp(x,y)
-    use psb_base_mod, only : psb_spk_, sone, szero
+    implicit none 
    real(psb_spk_) ::  b2_exp
    real(psb_spk_), intent(in) :: x,y
    b2_exp = szero
  end function b2_exp
  function c_exp(x,y)
-    use psb_base_mod, only : psb_spk_, sone, szero
+    implicit none 
    real(psb_spk_) ::  c_exp
    real(psb_spk_), intent(in) :: x,y
    c_exp = szero
  end function c_exp
  function a1_exp(x,y)
-    use psb_base_mod, only : psb_spk_, sone, szero
+    implicit none 
    real(psb_spk_) ::  a1_exp
    real(psb_spk_), intent(in) :: x,y
-    a1=sone*epsilon*exp(-(x+y))
+    a1_exp=sone*epsilon*exp(-(x+y))
  end function a1_exp
  function a2_exp(x,y)
-    use psb_base_mod, only : psb_spk_, sone, szero
+    implicit none 
    real(psb_spk_) ::  a2_exp
    real(psb_spk_), intent(in) :: x,y
-    a2=sone*epsilon*exp(-(x+y))
+    a2_exp=sone*epsilon*exp(-(x+y))
  end function a2_exp
  function g_exp(x,y)
-    use psb_base_mod, only : psb_spk_, sone, szero
+    implicit none 
    real(psb_spk_) ::  g_exp
    real(psb_spk_), intent(in) :: x,y
    g_exp = szero
@@ -0,0 +1,89 @@
+!
+!
+!                             AMG4PSBLAS version 1.0
+!    Algebraic Multigrid Package
+!               based on PSBLAS (Parallel Sparse BLAS version 3.7)
+!
+!    (C) Copyright 2021
+!
+!        Salvatore Filippone
+!        Pasqua D'Ambra
+!        Fabio Durastante
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+module amg_s_pde2d_gauss_mod
+  use psb_base_mod, only : psb_spk_, sone, szero
+  real(psb_spk_), save, private :: epsilon=sone/80
+contains
+  subroutine pde_set_parm2d_gauss(dat)
+    real(psb_spk_), intent(in) :: dat
+    epsilon = dat
+  end subroutine pde_set_parm2d_gauss
+  !
+  ! functions parametrizing the differential equation
+  !
+  function b1_gauss(x,y)
+    implicit none 
+    real(psb_spk_) :: b1_gauss
+    real(psb_spk_), intent(in) :: x,y
+    b1_gauss=sone/sqrt(3.0_psb_spk_)-2*x*exp(-(x**2+y**2))
+  end function b1_gauss
+  function b2_gauss(x,y)
+    implicit none 
+    real(psb_spk_) ::  b2_gauss
+    real(psb_spk_), intent(in) :: x,y
+    b2_gauss=sone/sqrt(3.0_psb_spk_)-2*y*exp(-(x**2+y**2))
+  end function b2_gauss
+  function c_gauss(x,y)
+    implicit none 
+    real(psb_spk_) ::  c_gauss
+    real(psb_spk_), intent(in) :: x,y
+    c_gauss=szero
+  end function c_gauss
+  function a1_gauss(x,y)
+    implicit none 
+    real(psb_spk_) ::  a1_gauss
+    real(psb_spk_), intent(in) :: x,y
+    a1_gauss=epsilon*exp(-(x**2+y**2))
+  end function a1_gauss
+  function a2_gauss(x,y)
+    implicit none 
+    real(psb_spk_) ::  a2_gauss
+    real(psb_spk_), intent(in) :: x,y
+    a2_gauss=epsilon*exp(-(x**2+y**2))
+  end function a2_gauss
+  function g_gauss(x,y)
+    implicit none 
+    real(psb_spk_) ::  g_gauss
+    real(psb_spk_), intent(in) :: x,y
+    g_gauss = szero
+    if (x == sone) then
+      g_gauss = sone
+    else if (x == szero) then
+      g_gauss = sone
+    end if
+  end function g_gauss
+end module amg_s_pde2d_gauss_mod
@@ -72,6 +72,7 @@ program amg_s_pde3d
  use data_input
  use amg_s_pde3d_base_mod
  use amg_s_pde3d_exp_mod
+  use amg_s_pde3d_box_mod
  use amg_s_pde3d_gauss_mod
  use amg_s_genpde_mod
 #if defined(OPENMP)
@@ -125,63 +126,65 @@ program amg_s_pde3d
    integer(psb_ipk_)  :: outer_sweeps ! number of outer sweeps: sweeps for 1-level,
    ! AMG cycles for ML
    ! general AMG data
-    character(len=16)  :: mlcycle      ! AMG cycle type
-    integer(psb_ipk_)  :: maxlevs     ! maximum number of levels in AMG preconditioner
+    character(len=32)  :: mlcycle      ! AMG cycle type
+    integer(psb_ipk_)  :: maxlevs      ! maximum number of levels in AMG preconditioner

    ! AMG aggregation
-    character(len=16)  :: aggr_prol    ! aggregation type: SMOOTHED, NONSMOOTHED
-    character(len=16)  :: par_aggr_alg ! parallel aggregation algorithm: DEC, SYMDEC
-    character(len=16)  :: aggr_type   ! Type of aggregation SOC1, SOC2, MATCHBOXP
-    integer(psb_ipk_)  :: aggr_size   ! Requested size of the aggregates for MATCHBOXP
-    character(len=16)  :: aggr_ord    ! ordering for aggregation: NATURAL, DEGREE
-    character(len=16)  :: aggr_filter ! filtering: FILTER, NO_FILTER
-    real(psb_spk_)     :: mncrratio  ! minimum aggregation ratio
+    character(len=32)  :: aggr_prol    ! aggregation type: SMOOTHED, NONSMOOTHED
+    character(len=32)  :: par_aggr_alg ! parallel aggregation algorithm: DEC, SYMDEC
+    character(len=32)  :: aggr_type    ! Type of aggregation SOC1, SOC2, MATCHBOXP
+    integer(psb_ipk_)  :: aggr_size    ! Requested size of the aggregates for MATCHBOXP
+    character(len=32)  :: aggr_ord     ! ordering for aggregation: NATURAL, DEGREE
+    character(len=32)  :: aggr_filter  ! filtering: FILTER, NO_FILTER
+    real(psb_spk_)      :: mncrratio    ! minimum aggregation ratio
    real(psb_spk_), allocatable :: athresv(:) ! smoothed aggregation threshold vector
-    integer(psb_ipk_)  :: thrvsz      ! size of threshold vector
-    real(psb_spk_)     :: athres      ! smoothed aggregation threshold
-    integer(psb_ipk_)  :: csizepp     ! minimum size of coarsest matrix per process
+    integer(psb_ipk_)  :: thrvsz       ! size of threshold vector
+    real(psb_spk_)      :: athres       ! smoothed aggregation threshold
+    integer(psb_ipk_)  :: csizepp      ! minimum size of coarsest matrix per process

    ! AMG smoother or pre-smoother; also 1-lev preconditioner
-    character(len=16)  :: smther      ! (pre-)smoother type: BJAC, AS
-    integer(psb_ipk_)  :: jsweeps     ! (pre-)smoother / 1-lev prec. sweeps
-    integer(psb_ipk_)  :: novr        ! number of overlap layers
-    character(len=16)  :: restr       ! restriction over application of AS
-    character(len=16)  :: prol        ! prolongation over application of AS
-    character(len=16)  :: solve       ! local subsolver type: ILU, MILU, ILUT,
-                                      ! UMF, MUMPS, SLU, FWGS, BWGS, JAC
-    character(len=16)  :: variant     ! AINV variant: LLK, etc
-    integer(psb_ipk_)  :: fill        ! fill-in for incomplete LU factorization
-    integer(psb_ipk_)  :: invfill     ! Inverse fill-in for INVK
-    real(psb_spk_)     :: thr         ! threshold for ILUT factorization
+    character(len=32)  :: smther       ! (pre-)smoother type: BJAC, AS
+    integer(psb_ipk_)  :: jsweeps      ! (pre-)smoother / 1-lev prec. sweeps
+    integer(psb_ipk_)  :: novr         ! number of overlap layers
+    character(len=32)  :: restr        ! restriction over application of AS
+    character(len=32)  :: prol         ! prolongation over application of AS
+    character(len=32)  :: solve        ! local subsolver type: ILU, MILU, ILUT,
+                                       ! UMF, MUMPS, SLU, FWGS, BWGS, JAC
+    integer(psb_ipk_)  :: ssweeps      ! inner solver sweeps
+    character(len=32)  :: variant      ! AINV variant: LLK, etc
+    integer(psb_ipk_)  :: fill         ! fill-in for incomplete LU factorization
+    integer(psb_ipk_)  :: invfill      ! Inverse fill-in for INVK
+    real(psb_spk_)      :: thr          ! threshold for ILUT factorization

    ! AMG post-smoother; ignored by 1-lev preconditioner
-    character(len=16)  :: smther2     ! post-smoother type: BJAC, AS
-    integer(psb_ipk_)  :: jsweeps2    ! post-smoother sweeps
-    integer(psb_ipk_)  :: novr2       ! number of overlap layers
-    character(len=16)  :: restr2      ! restriction  over application of AS
-    character(len=16)  :: prol2       ! prolongation over application of AS
-    character(len=16)  :: solve2      ! local subsolver type: ILU, MILU, ILUT,
-                                      ! UMF, MUMPS, SLU, FWGS, BWGS, JAC
-    character(len=16)  :: variant2    ! AINV variant: LLK, etc
-    integer(psb_ipk_)  :: fill2       ! fill-in for incomplete LU factorization
-    integer(psb_ipk_)  :: invfill2    ! Inverse fill-in for INVK
-    real(psb_spk_)      :: thr2        ! threshold for ILUT factorization
+    character(len=32)  :: smther2      ! post-smoother type: BJAC, AS
+    integer(psb_ipk_)  :: jsweeps2     ! post-smoother sweeps
+    integer(psb_ipk_)  :: novr2        ! number of overlap layers
+    character(len=32)  :: restr2       ! restriction  over application of AS
+    character(len=32)  :: prol2        ! prolongation over application of AS
+    character(len=32)  :: solve2       ! local subsolver type: ILU, MILU, ILUT,
+                                       ! UMF, MUMPS, SLU, FWGS, BWGS, JAC
+    integer(psb_ipk_)  :: ssweeps2     ! inner solver sweeps
+    character(len=32)  :: variant2     ! AINV variant: LLK, etc
+    integer(psb_ipk_)  :: fill2        ! fill-in for incomplete LU factorization
+    integer(psb_ipk_)  :: invfill2     ! Inverse fill-in for INVK
+    real(psb_spk_)      :: thr2         ! threshold for ILUT factorization

    ! coarsest-level solver
-    character(len=16)  :: cmat        ! coarsest matrix layout: REPL, DIST
-    character(len=16)  :: csolve      ! coarsest-lev solver: BJAC, SLUDIST (distr.
-                                      ! mat.); UMF, MUMPS, SLU, ILU, ILUT, MILU
-                                      ! (repl. mat.)
-    character(len=16)  :: csbsolve    ! coarsest-lev local subsolver: ILU, ILUT,
-                                      ! MILU, UMF, MUMPS, SLU
-    integer(psb_ipk_)  :: cfill       ! fill-in for incomplete LU factorization
-    real(psb_spk_)     :: cthres      ! threshold for ILUT factorization
-    integer(psb_ipk_)  :: cjswp       ! sweeps for GS or JAC coarsest-lev subsolver
+    character(len=32)  :: cmat         ! coarsest matrix layout: REPL, DIST
+    character(len=32)  :: csolve       ! coarsest-lev solver: BJAC, SLUDIST (distr.
+                                       ! mat.); UMF, MUMPS, SLU, ILU, ILUT, MILU
+                                       ! (repl. mat.)
+    character(len=32)  :: csbsolve     ! coarsest-lev local subsolver: ILU, ILUT,
+                                       ! MILU, UMF, MUMPS, SLU
+    integer(psb_ipk_)  :: cfill        ! fill-in for incomplete LU factorization
+    real(psb_spk_)     :: cthres        ! threshold for ILUT factorization
+    integer(psb_ipk_)  :: cjswp        ! sweeps for GS or JAC coarsest-lev subsolver

    ! Dump data
    logical            :: dump = .false.
-    integer(psb_ipk_)  :: dlmin       ! Minimum level to dump 
-    integer(psb_ipk_)  :: dlmax       ! Maximum level to dump
+    integer(psb_ipk_)  :: dlmin        ! Minimum level to dump 
+    integer(psb_ipk_)  :: dlmax        ! Maximum level to dump
    logical            :: dump_ac         = .false.
    logical            :: dump_rp         = .false.
    logical            :: dump_tprol      = .false.
@@ -241,10 +244,13 @@ program amg_s_pde3d
  select case(psb_toupper(trim(pdecoeff)))
  case("CONST")
    call amg_gen_pde3d(ctxt,idim,a,b,x,desc_a,afmt,&
-        & a1,a2,a3,b1,b2,b3,c,g,info)
+        & a1_base,a2_base,a3_base,b1_base,b2_base,b3_base,c_base,g_base,info)
  case("EXP")
    call amg_gen_pde3d(ctxt,idim,a,b,x,desc_a,afmt,&
        & a1_exp,a2_exp,a3_exp,b1_exp,b2_exp,b3_exp,c_exp,g_exp,info)
+  case("BOX")
+    call amg_gen_pde3d(ctxt,idim,a,b,x,desc_a,afmt,&
+        & a1_box,a2_box,a3_box,b1_box,b2_box,b3_box,c_box,g_box,info)
  case("GAUSS")
    call amg_gen_pde3d(ctxt,idim,a,b,x,desc_a,afmt,&
        & a1_gauss,a2_gauss,a3_gauss,b1_gauss,b2_gauss,b3_gauss,c_gauss,g_gauss,info)
@@ -286,6 +292,7 @@ program amg_s_pde3d
  case ('BJAC')
    call prec%set('smoother_sweeps', p_choice%jsweeps, info)
    call prec%set('sub_solve',       p_choice%solve,   info)
+    call prec%set('solver_sweeps',   p_choice%ssweeps,   info)
    if (psb_toupper(p_choice%solve)=='MUMPS') &
         & call prec%set('mumps_loc_glob','local_solver',info)
    call prec%set('sub_fillin',      p_choice%fill,    info)
@@ -297,6 +304,7 @@ program amg_s_pde3d
    call prec%set('sub_restr',       p_choice%restr,   info)
    call prec%set('sub_prol',        p_choice%prol,    info)
    call prec%set('sub_solve',       p_choice%solve,   info)
+    call prec%set('solver_sweeps',   p_choice%ssweeps,   info)
    if (psb_toupper(p_choice%solve)=='MUMPS') &
         & call prec%set('mumps_loc_glob','local_solver',info)
    call prec%set('sub_fillin',      p_choice%fill,    info)
@@ -353,7 +361,7 @@ program amg_s_pde3d
        if (psb_toupper(p_choice%solve)=='MUMPS') &
             & call prec%set('mumps_loc_glob','local_solver',info)
      end select
-
+      call prec%set('solver_sweeps',   p_choice%ssweeps,   info)
      call prec%set('sub_fillin',      p_choice%fill,       info)
      call prec%set('inv_fillin',      p_choice%invfill,    info)
      call prec%set('sub_iluthrs',     p_choice%thr,        info)
@@ -382,7 +390,7 @@ program amg_s_pde3d
          if (psb_toupper(p_choice%solve2)=='MUMPS') &
               & call prec%set('mumps_loc_glob','local_solver',info)
        end select
-
+        call prec%set('solver_sweeps',   p_choice%ssweeps2,   info,pos='post')
        call prec%set('sub_fillin',      p_choice%fill2,     info,pos='post')
        call prec%set('inv_fillin',      p_choice%invfill2,  info,pos='post')
        call prec%set('sub_iluthrs',     p_choice%thr2,      info,pos='post')
@@ -500,7 +508,7 @@ program amg_s_pde3d
    write(psb_out_unit,'("Storage format for DESC_A          : ",a  )') desc_a%get_fmt()

  end if
-  call psb_print_timers(ctxt)
+
  !
  !  cleanup storage and exit
  !
@@ -581,6 +589,7 @@ contains
      call read_data(prec%restr,inp_unit)      ! restriction  over application of AS
      call read_data(prec%prol,inp_unit)       ! prolongation over application of AS
      call read_data(prec%solve,inp_unit)      ! local subsolver
+      call read_data(prec%ssweeps,inp_unit)    ! inner solver sweeps 
      call read_data(prec%variant,inp_unit)    ! AINV variant
      call read_data(prec%fill,inp_unit)       ! fill-in for incomplete LU
      call read_data(prec%invfill,inp_unit)    !Inverse fill-in for INVK
@@ -592,6 +601,7 @@ contains
      call read_data(prec%restr2,inp_unit)      ! restriction  over application of AS
      call read_data(prec%prol2,inp_unit)       ! prolongation over application of AS
      call read_data(prec%solve2,inp_unit)      ! local subsolver
+      call read_data(prec%ssweeps2,inp_unit)    ! inner solver sweeps 
      call read_data(prec%variant2,inp_unit)    ! AINV variant
      call read_data(prec%fill2,inp_unit)       ! fill-in for incomplete LU
      call read_data(prec%invfill2,inp_unit)    !Inverse fill-in for INVK
@@ -661,6 +671,7 @@ contains
    call psb_bcast(ctxt,prec%restr)
    call psb_bcast(ctxt,prec%prol)
    call psb_bcast(ctxt,prec%solve)
+    call psb_bcast(ctxt,prec%ssweeps)
    call psb_bcast(ctxt,prec%variant)
    call psb_bcast(ctxt,prec%fill)
    call psb_bcast(ctxt,prec%invfill)
@@ -672,6 +683,7 @@ contains
    call psb_bcast(ctxt,prec%restr2)
    call psb_bcast(ctxt,prec%prol2)
    call psb_bcast(ctxt,prec%solve2)
+    call psb_bcast(ctxt,prec%ssweeps2)
    call psb_bcast(ctxt,prec%variant2)
    call psb_bcast(ctxt,prec%fill2)
    call psb_bcast(ctxt,prec%invfill2)
@@ -35,67 +35,67 @@
 !    POSSIBILITY OF SUCH DAMAGE.
 !
 module amg_s_pde3d_base_mod
-  use psb_base_mod, only : psb_spk_, sone
+  use psb_base_mod, only : psb_spk_, sone, szero
  real(psb_spk_), save, private :: epsilon=sone/80
 contains
-  subroutine pde_set_parm(dat)
+  subroutine pde_set_parm3d_base(dat)
    real(psb_spk_), intent(in) :: dat
    epsilon = dat
-  end subroutine pde_set_parm
+  end subroutine pde_set_parm3d_base
  !
  ! functions parametrizing the differential equation
  !
-  function b1(x,y,z)
-    use psb_base_mod, only : psb_spk_, sone
-    real(psb_spk_) :: b1
+  function b1_base(x,y,z)
+    implicit none 
+    real(psb_spk_) :: b1_base
    real(psb_spk_), intent(in) :: x,y,z
-    b1=sone/sqrt(3.0_psb_spk_)
-  end function b1
-  function b2(x,y,z)
-    use psb_base_mod, only : psb_spk_, sone
-    real(psb_spk_) ::  b2
+    b1_base=szero/sqrt(3.0_psb_spk_)
+  end function b1_base
+  function b2_base(x,y,z)
+    implicit none 
+    real(psb_spk_) ::  b2_base
    real(psb_spk_), intent(in) :: x,y,z
-    b2=sone/sqrt(3.0_psb_spk_)
-  end function b2
-  function b3(x,y,z)
-    use psb_base_mod, only : psb_spk_, sone
-    real(psb_spk_) ::  b3
+    b2_base=szero/sqrt(3.0_psb_spk_)
+  end function b2_base
+  function b3_base(x,y,z)
+    implicit none 
+    real(psb_spk_) ::  b3_base
    real(psb_spk_), intent(in) :: x,y,z
-    b3=sone/sqrt(3.0_psb_spk_)
-  end function b3
-  function c(x,y,z)
-    use psb_base_mod, only : psb_spk_, szero, sone
-    real(psb_spk_) ::  c
+    b3_base=szero/sqrt(3.0_psb_spk_)
+  end function b3_base
+  function c_base(x,y,z)
+    implicit none 
+    real(psb_spk_) ::  c_base
    real(psb_spk_), intent(in) :: x,y,z
-    c=szero
-  end function c
-  function a1(x,y,z)
-    use psb_base_mod, only : psb_spk_
-    real(psb_spk_) ::  a1
+    c_base=szero
+  end function c_base
+  function a1_base(x,y,z)
+    implicit none 
+    real(psb_spk_) ::  a1_base
    real(psb_spk_), intent(in) :: x,y,z
-    a1=epsilon
-  end function a1
-  function a2(x,y,z)
-    use psb_base_mod, only : psb_spk_
-    real(psb_spk_) ::  a2
+    a1_base=epsilon
+  end function a1_base
+  function a2_base(x,y,z)
+    implicit none 
+    real(psb_spk_) ::  a2_base
    real(psb_spk_), intent(in) :: x,y,z
-    a2=epsilon
-  end function a2
-  function a3(x,y,z)
-    use psb_base_mod, only : psb_spk_
-    real(psb_spk_) ::  a3
+    a2_base=epsilon
+  end function a2_base
+  function a3_base(x,y,z)
+    implicit none 
+    real(psb_spk_) ::  a3_base
    real(psb_spk_), intent(in) :: x,y,z
-    a3=epsilon
-  end function a3
-  function g(x,y,z)
-    use psb_base_mod, only : psb_spk_, sone, szero
-    real(psb_spk_) ::  g
+    a3_base=epsilon
+  end function a3_base
+  function g_base(x,y,z)
+    implicit none 
+    real(psb_spk_) ::  g_base
    real(psb_spk_), intent(in) :: x,y,z
-    g = szero
+    g_base = szero
    if (x == sone) then
-      g = sone
+      g_base = sone
    else if (x == szero) then
-      g = sone
+      g_base = sone
    end if
-  end function g
+  end function g_base
 end module amg_s_pde3d_base_mod
@@ -0,0 +1,101 @@
+!
+!
+!                             AMG4PSBLAS version 1.0
+!    Algebraic Multigrid Package
+!               based on PSBLAS (Parallel Sparse BLAS version 3.7)
+!
+!    (C) Copyright 2021
+!
+!        Salvatore Filippone
+!        Pasqua D'Ambra
+!        Fabio Durastante
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+module amg_s_pde3d_box_mod
+  use psb_base_mod, only : psb_spk_, sone, szero
+  real(psb_spk_), save, private :: epsilon=sone/80
+contains
+  subroutine pde_set_parm3d_box(dat)
+    real(psb_spk_), intent(in) :: dat
+    epsilon = dat
+  end subroutine pde_set_parm3d_box
+  !
+  ! functions parametrizing the differential equation
+  !
+  function b1_box(x,y,z)
+    implicit none 
+    real(psb_spk_) :: b1_box
+    real(psb_spk_), intent(in) :: x,y,z
+    b1_box=sone/sqrt(3.0_psb_spk_)
+  end function b1_box
+  function b2_box(x,y,z)
+    implicit none 
+    real(psb_spk_) ::  b2_box
+    real(psb_spk_), intent(in) :: x,y,z
+    b2_box=sone/sqrt(3.0_psb_spk_)
+  end function b2_box
+  function b3_box(x,y,z)
+    implicit none 
+    real(psb_spk_) ::  b3_box
+    real(psb_spk_), intent(in) :: x,y,z
+    b3_box=sone/sqrt(3.0_psb_spk_)
+  end function b3_box
+  function c_box(x,y,z)
+    implicit none 
+    real(psb_spk_) ::  c_box
+    real(psb_spk_), intent(in) :: x,y,z
+    c_box=szero
+  end function c_box
+  function a1_box(x,y,z)
+    implicit none 
+    real(psb_spk_) ::  a1_box
+    real(psb_spk_), intent(in) :: x,y,z
+    a1_box=epsilon
+  end function a1_box
+  function a2_box(x,y,z)
+    implicit none 
+    real(psb_spk_) ::  a2_box
+    real(psb_spk_), intent(in) :: x,y,z
+    a2_box=epsilon
+  end function a2_box
+  function a3_box(x,y,z)
+    implicit none 
+    real(psb_spk_) ::  a3_box
+    real(psb_spk_), intent(in) :: x,y,z
+    a3_box=epsilon
+  end function a3_box
+  function g_box(x,y,z)
+    implicit none 
+    real(psb_spk_) ::  g_box
+    real(psb_spk_), intent(in) :: x,y,z
+    g_box= szero
+    if (x == sone) then
+      g_box = sone
+    else if (x == szero) then
+      g_box = sone
+    end if
+  end function g_box
+end module amg_s_pde3d_box_mod
@@ -35,60 +35,60 @@
 !    POSSIBILITY OF SUCH DAMAGE.
 !
 module amg_s_pde3d_exp_mod
-  use psb_base_mod, only : psb_spk_, sone
+  use psb_base_mod, only : psb_spk_, sone, szero
  real(psb_spk_), save, private :: epsilon=sone/160
 contains
-  subroutine pde_set_parm(dat)
+  subroutine pde_set_parm3d_exp(dat)
    real(psb_spk_), intent(in) :: dat
    epsilon = dat
-  end subroutine pde_set_parm
+  end subroutine pde_set_parm3d_exp
  !
  ! functions parametrizing the differential equation
  !
  function b1_exp(x,y,z)
-    use psb_base_mod, only : psb_spk_, szero
+    implicit none 
    real(psb_spk_) :: b1_exp
    real(psb_spk_), intent(in) :: x,y,z
    b1_exp=szero/sqrt(3.0_psb_spk_)
  end function b1_exp
  function b2_exp(x,y,z)
-    use psb_base_mod, only : psb_spk_, szero
+    implicit none 
    real(psb_spk_) ::  b2_exp
    real(psb_spk_), intent(in) :: x,y,z
    b2_exp=szero/sqrt(3.0_psb_spk_)
  end function b2_exp
  function b3_exp(x,y,z)
-    use psb_base_mod, only : psb_spk_, szero
+    implicit none 
    real(psb_spk_) ::  b3_exp
    real(psb_spk_), intent(in) :: x,y,z
    b3_exp=szero/sqrt(3.0_psb_spk_)
  end function b3_exp
  function c_exp(x,y,z)
-    use psb_base_mod, only : psb_spk_, szero
+    implicit none 
    real(psb_spk_) ::  c_exp
    real(psb_spk_), intent(in) :: x,y,z
    c_exp=szero
  end function c_exp
  function a1_exp(x,y,z)
-    use psb_base_mod, only : psb_spk_
+    implicit none 
    real(psb_spk_) ::  a1_exp
    real(psb_spk_), intent(in) :: x,y,z
    a1_exp=epsilon*exp(-(x+y+z))
  end function a1_exp
  function a2_exp(x,y,z)
-    use psb_base_mod, only : psb_spk_
+    implicit none 
    real(psb_spk_) ::  a2_exp
    real(psb_spk_), intent(in) :: x,y,z
    a2_exp=epsilon*exp(-(x+y+z))
  end function a2_exp
  function a3_exp(x,y,z)
-    use psb_base_mod, only : psb_spk_
+    implicit none 
    real(psb_spk_) ::  a3_exp
    real(psb_spk_), intent(in) :: x,y,z
    a3_exp=epsilon*exp(-(x+y+z))
  end function a3_exp
  function g_exp(x,y,z)
-    use psb_base_mod, only : psb_spk_, sone, szero
+    implicit none 
    real(psb_spk_) ::  g_exp
    real(psb_spk_), intent(in) :: x,y,z
    g_exp = szero
@@ -35,60 +35,60 @@
 !    POSSIBILITY OF SUCH DAMAGE.
 !
 module amg_s_pde3d_gauss_mod
-  use psb_base_mod, only : psb_spk_, sone
+  use psb_base_mod, only : psb_spk_, sone, szero
  real(psb_spk_), save, private :: epsilon=sone/80
 contains
-  subroutine pde_set_parm(dat)
+  subroutine pde_set_parm3d_gauss(dat)
    real(psb_spk_), intent(in) :: dat
    epsilon = dat
-  end subroutine pde_set_parm
+  end subroutine pde_set_parm3d_gauss
  !
  ! functions parametrizing the differential equation
  !
  function b1_gauss(x,y,z)
-    use psb_base_mod, only : psb_spk_, sone
+    implicit none 
    real(psb_spk_) :: b1_gauss
    real(psb_spk_), intent(in) :: x,y,z
    b1_gauss=sone/sqrt(3.0_psb_spk_)-2*x*exp(-(x**2+y**2+z**2))
  end function b1_gauss
  function b2_gauss(x,y,z)
-    use psb_base_mod, only : psb_spk_, sone
+    implicit none 
    real(psb_spk_) ::  b2_gauss
    real(psb_spk_), intent(in) :: x,y,z
    b2_gauss=sone/sqrt(3.0_psb_spk_)-2*y*exp(-(x**2+y**2+z**2))
  end function b2_gauss
  function b3_gauss(x,y,z)
-    use psb_base_mod, only : psb_spk_, sone
+    implicit none 
    real(psb_spk_) ::  b3_gauss
    real(psb_spk_), intent(in) :: x,y,z
    b3_gauss=sone/sqrt(3.0_psb_spk_)-2*z*exp(-(x**2+y**2+z**2))
  end function b3_gauss
  function c_gauss(x,y,z)
-    use psb_base_mod, only : psb_spk_, szero
+    implicit none 
    real(psb_spk_) ::  c_gauss
    real(psb_spk_), intent(in) :: x,y,z
-    c=szero
+    c_gauss=szero
  end function c_gauss
  function a1_gauss(x,y,z)
-    use psb_base_mod, only : psb_spk_
+    implicit none 
    real(psb_spk_) ::  a1_gauss
    real(psb_spk_), intent(in) :: x,y,z
    a1_gauss=epsilon*exp(-(x**2+y**2+z**2))
  end function a1_gauss
  function a2_gauss(x,y,z)
-    use psb_base_mod, only : psb_spk_
+    implicit none 
    real(psb_spk_) ::  a2_gauss
    real(psb_spk_), intent(in) :: x,y,z
    a2_gauss=epsilon*exp(-(x**2+y**2+z**2))
  end function a2_gauss
  function a3_gauss(x,y,z)
-    use psb_base_mod, only : psb_spk_
+    implicit none 
    real(psb_spk_) ::  a3_gauss
    real(psb_spk_), intent(in) :: x,y,z
    a3_gauss=epsilon*exp(-(x**2+y**2+z**2))
  end function a3_gauss
  function g_gauss(x,y,z)
-    use psb_base_mod, only : psb_spk_, sone, szero
+    implicit none 
    real(psb_spk_) ::  g_gauss
    real(psb_spk_), intent(in) :: x,y,z
    g_gauss = szero
@@ -18,6 +18,7 @@ BJAC                        ! Smoother type JACOBI FBGS GS BWGS BJAC AS. For 1-l
 HALO                        ! AS restriction operator: NONE HALO
 NONE                        ! AS prolongation operator: NONE SUM AVG
 ILU                         ! Subdomain solver for BJAC/AS: JACOBI GS BGS ILU ILUT MILU MUMPS SLU UMF
+8                           ! Inner solver sweeps (GS and JACOBI)
 LLK                         ! AINV variant, ignored otherwise
 0                           ! Fill level P for ILU(P) and ILU(T,P)
 1                           ! Inverse Fill level P for INVK
@@ -29,6 +30,7 @@ NONE                        ! Second (post) smoother, ignored if NONE
 HALO                        ! AS restriction operator: NONE HALO
 NONE                        ! AS prolongation operator: NONE SUM AVG
 ILU                         ! Subdomain solver for BJAC/AS: JACOBI GS BGS ILU ILUT MILU MUMPS SLU UMF
+8                           ! Inner solver sweeps (GS and JACOBI)
 LLK                         ! AINV variant, ignored otherwise
 0                           ! Fill level P for ILU(P) and ILU(T,P)
 8                           ! Inverse Fill level P for INVK
@@ -2,22 +2,23 @@
 CSR                         ! Storage format CSR COO JAD
 0040                        ! IDIM; domain size. Linear system size is IDIM**3
 CONST                       ! PDECOEFF: CONST, EXP, GAUSS Coefficients of the PDE
-BICGSTAB                    ! Iterative method: BiCGSTAB BiCGSTABL BiCG CG CGS FCG GCR RGMRES
+CG                          ! Iterative method: BiCGSTAB BiCGSTABL BiCG CG CGS FCG GCR RGMRES
 2                           ! ISTOPC
-00500                       ! ITMAX
+00008                       ! ITMAX
 1                           ! ITRACE
 30                          ! IRST (restart for RGMRES and BiCGSTABL)
 1.d-6                       ! EPS
 %%%%%%%%%%%  Main preconditioner choices %%%%%%%%%%%%%%%%
-ML-VBM-VCYCLE-FBGS-D-BJAC       ! Longer descriptive name for preconditioner (up to 20 chars)
-BJAC                        ! Preconditioner type: NONE JACOBI GS FBGS BJAC AS ML
+ML-VBM-VCYCLE-FBGS-D-BJAC   ! Longer descriptive name for preconditioner (up to 20 chars)
+ML                          ! Preconditioner type: NONE JACOBI GS FBGS BJAC AS ML
 %%%%%%%%%%%  First smoother (for all levels but coarsest) %%%%%%%%%%%%%%%%
-BJAC                        ! Smoother type JACOBI FBGS GS BWGS BJAC AS. For 1-level, repeats previous.
-1                           ! Number of sweeps for smoother
+L1-JACOBI                   ! Smoother type JACOBI FBGS GS BWGS BJAC AS. For 1-level, repeats previous.
+4                           ! Number of sweeps for smoother
 0                           ! Number of overlap layers for AS preconditioner
 HALO                        ! AS restriction operator: NONE HALO
 NONE                        ! AS prolongation operator: NONE SUM AVG
 JACOBI                      ! Subdomain solver for BJAC/AS: JACOBI GS BGS ILU ILUT MILU MUMPS SLU UMF
+8                           ! Inner solver sweeps (GS and JACOBI)
 LLK                         ! AINV variant
 0                           ! Fill level P for ILU(P) and ILU(T,P)
 1                           ! Inverse Fill level P for INVK
@@ -29,6 +30,7 @@ NONE                        ! Second (post) smoother, ignored if NONE
 HALO                        ! AS restriction operator: NONE HALO
 NONE                        ! AS prolongation operator: NONE SUM AVG
 ILU                         ! Subdomain solver for BJAC/AS: JACOBI GS BGS ILU ILUT MILU MUMPS SLU UMF
+8                           ! Inner solver sweeps (GS and JACOBI)
 LLK                         ! AINV variant
 0                           ! Fill level P for ILU(P) and ILU(T,P)
 8                           ! Inverse Fill level P for INVK
Author	SHA1	Message	Date
Salvatore Filippone	e06338f7fb	Take out print_times from sample	2023-11-26 19:28:03 +01:00
sfilippone	0c58e1a95c	Fix sample input file.	2023-11-26 14:32:32 +01:00
sfilippone	c2fd0ac66d	Disable MATCHBOX with SERIAL_MPI and add error message	2023-11-26 11:43:10 +01:00
sfilippone	5387e206b1	Fixed sample programs	2023-11-24 16:07:22 +01:00
sfilippone	fc34385341	Fix matrix generation for samples	2023-11-16 17:55:42 +01:00
sfilippone	5fbdfb1436	Fix free for jac_solver	2023-11-16 17:55:24 +01:00
sfilippone	1dcb542e4a	Include solver_sweeps in test program	2023-10-30 16:10:12 +01:00