diff --git a/base/modules/tools/psb_c_tools_mod.f90 b/base/modules/tools/psb_c_tools_mod.f90
index 49542ba2..7257f592 100644
--- a/base/modules/tools/psb_c_tools_mod.f90
+++ b/base/modules/tools/psb_c_tools_mod.f90
@@ -32,7 +32,7 @@
 Module psb_c_tools_mod
   use psb_desc_mod, only : psb_desc_type, psb_spk_, psb_ipk_, psb_lpk_
   use psb_c_vect_mod, only : psb_c_base_vect_type, psb_c_vect_type
-  use psb_c_mat_mod, only : psb_cspmat_type, psb_c_base_sparse_mat
+  use psb_c_mat_mod, only : psb_cspmat_type, psb_lcspmat_type, psb_c_base_sparse_mat
   use psb_l_vect_mod, only : psb_l_vect_type
   use psb_c_multivect_mod, only : psb_c_base_multivect_type, psb_c_multivect_type
 
@@ -197,6 +197,18 @@ Module psb_c_tools_mod
       character(len=5), optional             :: outfmt 
       integer(psb_ipk_), intent(in), optional          :: data
     end Subroutine psb_csphalo
+    Subroutine psb_lcsphalo(a,desc_a,blk,info,rowcnv,colcnv,&
+         & rowscale,colscale,outfmt,data)
+      import
+      implicit none
+      Type(psb_lcspmat_type),Intent(in)       :: a
+      Type(psb_lcspmat_type),Intent(inout)    :: blk
+      Type(psb_desc_type),Intent(in), target :: desc_a
+      integer(psb_ipk_), intent(out)                   :: info
+      logical, optional, intent(in)          :: rowcnv,colcnv,rowscale,colscale
+      character(len=5), optional             :: outfmt 
+      integer(psb_ipk_), intent(in), optional          :: data
+    end Subroutine psb_lcsphalo
   end interface
 
 
diff --git a/base/modules/tools/psb_d_tools_mod.f90 b/base/modules/tools/psb_d_tools_mod.f90
index 7f2dbee2..624a7e07 100644
--- a/base/modules/tools/psb_d_tools_mod.f90
+++ b/base/modules/tools/psb_d_tools_mod.f90
@@ -32,7 +32,7 @@
 Module psb_d_tools_mod
   use psb_desc_mod, only : psb_desc_type, psb_dpk_, psb_ipk_, psb_lpk_
   use psb_d_vect_mod, only : psb_d_base_vect_type, psb_d_vect_type
-  use psb_d_mat_mod, only : psb_dspmat_type, psb_d_base_sparse_mat
+  use psb_d_mat_mod, only : psb_dspmat_type, psb_ldspmat_type, psb_d_base_sparse_mat
   use psb_l_vect_mod, only : psb_l_vect_type
   use psb_d_multivect_mod, only : psb_d_base_multivect_type, psb_d_multivect_type
 
@@ -197,6 +197,18 @@ Module psb_d_tools_mod
       character(len=5), optional             :: outfmt 
       integer(psb_ipk_), intent(in), optional          :: data
     end Subroutine psb_dsphalo
+    Subroutine psb_ldsphalo(a,desc_a,blk,info,rowcnv,colcnv,&
+         & rowscale,colscale,outfmt,data)
+      import
+      implicit none
+      Type(psb_ldspmat_type),Intent(in)       :: a
+      Type(psb_ldspmat_type),Intent(inout)    :: blk
+      Type(psb_desc_type),Intent(in), target :: desc_a
+      integer(psb_ipk_), intent(out)                   :: info
+      logical, optional, intent(in)          :: rowcnv,colcnv,rowscale,colscale
+      character(len=5), optional             :: outfmt 
+      integer(psb_ipk_), intent(in), optional          :: data
+    end Subroutine psb_ldsphalo
   end interface
 
 
diff --git a/base/modules/tools/psb_s_tools_mod.f90 b/base/modules/tools/psb_s_tools_mod.f90
index 8fd29c04..aaed4bb1 100644
--- a/base/modules/tools/psb_s_tools_mod.f90
+++ b/base/modules/tools/psb_s_tools_mod.f90
@@ -32,7 +32,7 @@
 Module psb_s_tools_mod
   use psb_desc_mod, only : psb_desc_type, psb_spk_, psb_ipk_, psb_lpk_
   use psb_s_vect_mod, only : psb_s_base_vect_type, psb_s_vect_type
-  use psb_s_mat_mod, only : psb_sspmat_type, psb_s_base_sparse_mat
+  use psb_s_mat_mod, only : psb_sspmat_type, psb_lsspmat_type, psb_s_base_sparse_mat
   use psb_l_vect_mod, only : psb_l_vect_type
   use psb_s_multivect_mod, only : psb_s_base_multivect_type, psb_s_multivect_type
 
@@ -197,6 +197,18 @@ Module psb_s_tools_mod
       character(len=5), optional             :: outfmt 
       integer(psb_ipk_), intent(in), optional          :: data
     end Subroutine psb_ssphalo
+    Subroutine psb_lssphalo(a,desc_a,blk,info,rowcnv,colcnv,&
+         & rowscale,colscale,outfmt,data)
+      import
+      implicit none
+      Type(psb_lsspmat_type),Intent(in)       :: a
+      Type(psb_lsspmat_type),Intent(inout)    :: blk
+      Type(psb_desc_type),Intent(in), target :: desc_a
+      integer(psb_ipk_), intent(out)                   :: info
+      logical, optional, intent(in)          :: rowcnv,colcnv,rowscale,colscale
+      character(len=5), optional             :: outfmt 
+      integer(psb_ipk_), intent(in), optional          :: data
+    end Subroutine psb_lssphalo
   end interface
 
 
diff --git a/base/modules/tools/psb_z_tools_mod.f90 b/base/modules/tools/psb_z_tools_mod.f90
index 79e630f1..e4648d9f 100644
--- a/base/modules/tools/psb_z_tools_mod.f90
+++ b/base/modules/tools/psb_z_tools_mod.f90
@@ -32,7 +32,7 @@
 Module psb_z_tools_mod
   use psb_desc_mod, only : psb_desc_type, psb_dpk_, psb_ipk_, psb_lpk_
   use psb_z_vect_mod, only : psb_z_base_vect_type, psb_z_vect_type
-  use psb_z_mat_mod, only : psb_zspmat_type, psb_z_base_sparse_mat
+  use psb_z_mat_mod, only : psb_zspmat_type, psb_lzspmat_type, psb_z_base_sparse_mat
   use psb_l_vect_mod, only : psb_l_vect_type
   use psb_z_multivect_mod, only : psb_z_base_multivect_type, psb_z_multivect_type
 
@@ -197,6 +197,18 @@ Module psb_z_tools_mod
       character(len=5), optional             :: outfmt 
       integer(psb_ipk_), intent(in), optional          :: data
     end Subroutine psb_zsphalo
+    Subroutine psb_lzsphalo(a,desc_a,blk,info,rowcnv,colcnv,&
+         & rowscale,colscale,outfmt,data)
+      import
+      implicit none
+      Type(psb_lzspmat_type),Intent(in)       :: a
+      Type(psb_lzspmat_type),Intent(inout)    :: blk
+      Type(psb_desc_type),Intent(in), target :: desc_a
+      integer(psb_ipk_), intent(out)                   :: info
+      logical, optional, intent(in)          :: rowcnv,colcnv,rowscale,colscale
+      character(len=5), optional             :: outfmt 
+      integer(psb_ipk_), intent(in), optional          :: data
+    end Subroutine psb_lzsphalo
   end interface
 
 
diff --git a/base/tools/psb_csphalo.F90 b/base/tools/psb_csphalo.F90
index 520f0f66..c8f6377c 100644
--- a/base/tools/psb_csphalo.F90
+++ b/base/tools/psb_csphalo.F90
@@ -182,7 +182,7 @@ Subroutine psb_csphalo(a,desc_a,blk,info,rowcnv,colcnv,&
   idxs = 0
   idxr = 0
 
-  call acoo%allocate(izero,a%get_ncols(),info)
+  call acoo%allocate(izero,a%get_ncols())
 
 
   call desc_a%get_list(data_,pdxv,totxch,nxr,nxs,info)
@@ -467,3 +467,324 @@ Subroutine psb_csphalo(a,desc_a,blk,info,rowcnv,colcnv,&
   return
 
 End Subroutine psb_csphalo
+
+
+Subroutine psb_lcsphalo(a,desc_a,blk,info,rowcnv,colcnv,&
+     &  rowscale,colscale,outfmt,data)
+  use psb_base_mod, psb_protect_name => psb_lcsphalo
+
+#ifdef MPI_MOD
+  use mpi
+#endif
+  Implicit None
+#ifdef MPI_H
+  include 'mpif.h'
+#endif
+
+  Type(psb_lcspmat_type),Intent(in)    :: a
+  Type(psb_lcspmat_type),Intent(inout) :: blk
+  Type(psb_desc_type),Intent(in), target :: desc_a
+  integer(psb_ipk_), intent(out)                :: info
+  logical, optional, intent(in)       :: rowcnv,colcnv,rowscale,colscale
+  character(len=5), optional          :: outfmt 
+  integer(psb_ipk_), intent(in), optional       :: data
+  !     ...local scalars....
+  integer(psb_ipk_) :: ictxt, np,me
+  integer(psb_ipk_) :: counter, proc, i, &
+       &     n_el_send,n_el_recv,&
+       &     n_elem, j, ipx,mat_recv, idxs,idxr,nz,&
+       &     data_,totxch,nxs, nxr
+  integer(psb_lpk_) :: r, k, irmin, irmax, icmin, icmax, iszs, iszr, &
+       & lidx, l1, lnr, lnc, idx, ngtz, tot_elem
+  integer(psb_mpk_) :: icomm, minfo
+  integer(psb_mpk_), allocatable  :: brvindx(:), &
+       & rvsz(:), bsdindx(:),sdsz(:)
+  integer(psb_lpk_), allocatable  :: iasnd(:), jasnd(:)
+  complex(psb_spk_), allocatable :: valsnd(:)
+  type(psb_lc_coo_sparse_mat), allocatable :: acoo
+  integer(psb_ipk_), pointer  :: idxv(:)
+  class(psb_i_base_vect_type), pointer :: pdxv
+  integer(psb_ipk_), allocatable :: ipdxv(:)
+  logical           :: rowcnv_,colcnv_,rowscale_,colscale_
+  character(len=5)  :: outfmt_
+  integer(psb_ipk_) :: debug_level, debug_unit, err_act
+  character(len=20) :: name, ch_err
+
+  info=psb_success_
+  name='psb_csphalo'
+  call psb_erractionsave(err_act)
+  if (psb_errstatus_fatal()) then
+    info = psb_err_internal_error_ ;    goto 9999
+  end if
+  debug_unit  = psb_get_debug_unit()
+  debug_level = psb_get_debug_level()
+
+  ictxt = desc_a%get_context()
+  icomm = desc_a%get_mpic()
+
+  Call psb_info(ictxt, me, np)
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),': Start'
+
+  if (present(rowcnv)) then 
+    rowcnv_ = rowcnv
+  else
+    rowcnv_ = .true.
+  endif
+  if (present(colcnv)) then 
+    colcnv_ = colcnv
+  else
+    colcnv_ = .true.
+  endif
+  if (present(rowscale)) then 
+    rowscale_ = rowscale
+  else
+    rowscale_ = .false.
+  endif
+  if (present(colscale)) then 
+    colscale_ = colscale
+  else
+    colscale_ = .false.
+  endif
+  if (present(data)) then 
+    data_ = data
+  else
+    data_ = psb_comm_halo_
+  endif
+
+  if (present(outfmt)) then 
+    outfmt_ =  psb_toupper(outfmt)
+  else
+    outfmt_ = 'CSR'
+  endif
+
+  Allocate(brvindx(np+1),&
+       & rvsz(np),sdsz(np),bsdindx(np+1), acoo,stat=info)
+
+  if (info /= psb_success_) then
+    info=psb_err_alloc_dealloc_
+    call psb_errpush(info,name)
+    goto 9999
+  end if
+
+  If (debug_level >= psb_debug_outer_)&
+       & write(debug_unit,*) me,' ',trim(name),': Data selector',data_
+
+  select case(data_) 
+  case(psb_comm_halo_,psb_comm_ext_ ) 
+    ! Do not accept OVRLAP_INDEX any longer. 
+  case default
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='wrong Data selector')
+    goto 9999
+  end select
+
+
+  sdsz(:)=0
+  rvsz(:)=0
+  l1  = 0
+  ipx = 1
+  brvindx(ipx) = 0
+  bsdindx(ipx) = 0
+  counter=1
+  idx = 0
+  idxs = 0
+  idxr = 0
+  lnc = a%get_ncols()
+  call acoo%allocate(lzero,lnc)
+
+
+  call desc_a%get_list(data_,pdxv,totxch,nxr,nxs,info)
+  ipdxv = pdxv%get_vect()
+  ! For all rows in the halo descriptor, extract and send/receive.
+  Do 
+    proc=ipdxv(counter)
+    if (proc == -1) exit
+    n_el_recv = ipdxv(counter+psb_n_elem_recv_)
+    counter   = counter+n_el_recv
+    n_el_send = ipdxv(counter+psb_n_elem_send_)
+    tot_elem = 0
+    Do j=0,n_el_send-1
+      idx = ipdxv(counter+psb_elem_send_+j)
+      n_elem = a%get_nz_row(idx)
+      tot_elem = tot_elem+n_elem      
+    Enddo
+    sdsz(proc+1) = tot_elem
+    call acoo%set_nrows(acoo%get_nrows() + n_el_recv)
+    counter   = counter+n_el_send+3
+  Enddo
+
+  call mpi_alltoall(sdsz,1,psb_mpi_mpk_,& 
+       & rvsz,1,psb_mpi_mpk_,icomm,minfo)
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='mpi_alltoall'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+  idxs = 0
+  idxr = 0
+  counter = 1
+  Do 
+    proc=ipdxv(counter)
+    if (proc == -1) exit
+    n_el_recv = ipdxv(counter+psb_n_elem_recv_)
+    counter   = counter+n_el_recv
+    n_el_send = ipdxv(counter+psb_n_elem_send_)
+
+    bsdindx(proc+1) = idxs
+    idxs = idxs + sdsz(proc+1)
+    brvindx(proc+1) = idxr
+    idxr = idxr + rvsz(proc+1)
+    counter   = counter+n_el_send+3
+  Enddo
+
+  iszr=sum(rvsz)
+  call acoo%reallocate(max(iszr,1))
+  if (debug_level >= psb_debug_outer_)&
+       & write(debug_unit,*) me,' ',trim(name),': Sizes:',acoo%get_size(),&
+       & ' Send:',sdsz(:),' Receive:',rvsz(:)
+  mat_recv = iszr
+  iszs=sum(sdsz)
+  if (info == psb_success_) call psb_ensure_size(max(iszs,1),iasnd,info)
+  if (info == psb_success_) call psb_ensure_size(max(iszs,1),jasnd,info)
+  if (info == psb_success_) call psb_ensure_size(max(iszs,1),valsnd,info)
+
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_;    ch_err='psb_sp_reall'
+    call psb_errpush(info,name,a_err=ch_err);  goto 9999
+  end if
+
+  l1  = 0
+  ipx = 1
+  counter=1
+  idx = 0
+
+  tot_elem=0
+  Do 
+    proc=ipdxv(counter)
+    if (proc == -1) exit 
+    n_el_recv=ipdxv(counter+psb_n_elem_recv_)
+    counter=counter+n_el_recv
+    n_el_send=ipdxv(counter+psb_n_elem_send_)
+
+    Do j=0,n_el_send-1
+      idx = ipdxv(counter+psb_elem_send_+j)
+      n_elem = a%get_nz_row(idx)
+      call a%csget(idx,idx,ngtz,iasnd,jasnd,valsnd,info,&
+           &  append=.true.,nzin=tot_elem)
+      if (info /= psb_success_) then
+        info=psb_err_from_subroutine_
+        ch_err='psb_sp_getrow'
+        call psb_errpush(info,name,a_err=ch_err)
+        goto 9999
+      end if
+      tot_elem=tot_elem+n_elem
+    Enddo
+    ipx = ipx + 1 
+    counter   = counter+n_el_send+3
+  Enddo
+  nz = tot_elem
+
+  if (rowcnv_) call psb_loc_to_glob(iasnd(1:nz),desc_a,info,iact='I')
+  if (colcnv_) call psb_loc_to_glob(jasnd(1:nz),desc_a,info,iact='I')
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='psb_loc_to_glob'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+
+  call mpi_alltoallv(valsnd,sdsz,bsdindx,psb_mpi_c_spk_,&
+       & acoo%val,rvsz,brvindx,psb_mpi_c_spk_,icomm,minfo)
+  call mpi_alltoallv(iasnd,sdsz,bsdindx,psb_mpi_lpk_,&
+       & acoo%ia,rvsz,brvindx,psb_mpi_lpk_,icomm,minfo)
+  call mpi_alltoallv(jasnd,sdsz,bsdindx,psb_mpi_lpk_,&
+       & acoo%ja,rvsz,brvindx,psb_mpi_lpk_,icomm,minfo)
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='mpi_alltoallv'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+  !
+  ! Convert into local numbering 
+  !
+  if (rowcnv_) call psb_glob_to_loc(acoo%ia(1:iszr),desc_a,info,iact='I')
+  if (colcnv_) call psb_glob_to_loc(acoo%ja(1:iszr),desc_a,info,iact='I')
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='psbglob_to_loc'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+  l1  = 0
+  call acoo%set_nrows(lzero)
+  !
+  irmin = huge(irmin)
+  icmin = huge(icmin)
+  irmax = 0
+  icmax = 0
+  Do i=1,iszr
+    r=(acoo%ia(i))
+    k=(acoo%ja(i))
+    ! Just in case some of the conversions were out-of-range
+    If ((r>0).and.(k>0)) Then
+      l1=l1+1
+      acoo%val(l1) = acoo%val(i)
+      acoo%ia(l1)  = r 
+      acoo%ja(l1)  = k
+      irmin = min(irmin,r)
+      irmax = max(irmax,r)
+      icmin = min(icmin,k)
+      icmax = max(icmax,k)
+    End If
+  Enddo
+  if (rowscale_) then 
+    call acoo%set_nrows(max(irmax-irmin+1,0))
+    acoo%ia(1:l1) = acoo%ia(1:l1) - irmin + 1
+  else    
+    call acoo%set_nrows(irmax)
+  end if
+  if (colscale_) then 
+    call acoo%set_ncols(max(icmax-icmin+1,0))
+    acoo%ja(1:l1) = acoo%ja(1:l1) - icmin + 1
+  else
+    call acoo%set_ncols(icmax)
+  end if
+
+  call acoo%set_nzeros(l1)
+  call acoo%set_sorted(.false.)
+
+  if (debug_level >= psb_debug_outer_)&
+       & write(debug_unit,*) me,' ',trim(name),&
+       & ': End data exchange',counter,l1
+
+  call move_alloc(acoo,blk%a)
+
+  ! Do we expect any duplicates to appear???? 
+  call blk%cscnv(info,type=outfmt_,dupl=psb_dupl_add_)
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='psb_spcnv'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+  Deallocate(brvindx,bsdindx,rvsz,sdsz,&
+       & iasnd,jasnd,valsnd,stat=info)
+  if (debug_level >= psb_debug_outer_)&
+       & write(debug_unit,*) me,' ',trim(name),': Done'
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(ictxt,err_act)
+
+  return
+
+End Subroutine psb_lcsphalo
diff --git a/base/tools/psb_dsphalo.F90 b/base/tools/psb_dsphalo.F90
index e76d03b3..18fce4e9 100644
--- a/base/tools/psb_dsphalo.F90
+++ b/base/tools/psb_dsphalo.F90
@@ -182,7 +182,7 @@ Subroutine psb_dsphalo(a,desc_a,blk,info,rowcnv,colcnv,&
   idxs = 0
   idxr = 0
 
-  call acoo%allocate(izero,a%get_ncols(),info)
+  call acoo%allocate(izero,a%get_ncols())
 
 
   call desc_a%get_list(data_,pdxv,totxch,nxr,nxs,info)
@@ -467,3 +467,324 @@ Subroutine psb_dsphalo(a,desc_a,blk,info,rowcnv,colcnv,&
   return
 
 End Subroutine psb_dsphalo
+
+
+Subroutine psb_ldsphalo(a,desc_a,blk,info,rowcnv,colcnv,&
+     &  rowscale,colscale,outfmt,data)
+  use psb_base_mod, psb_protect_name => psb_ldsphalo
+
+#ifdef MPI_MOD
+  use mpi
+#endif
+  Implicit None
+#ifdef MPI_H
+  include 'mpif.h'
+#endif
+
+  Type(psb_ldspmat_type),Intent(in)    :: a
+  Type(psb_ldspmat_type),Intent(inout) :: blk
+  Type(psb_desc_type),Intent(in), target :: desc_a
+  integer(psb_ipk_), intent(out)                :: info
+  logical, optional, intent(in)       :: rowcnv,colcnv,rowscale,colscale
+  character(len=5), optional          :: outfmt 
+  integer(psb_ipk_), intent(in), optional       :: data
+  !     ...local scalars....
+  integer(psb_ipk_) :: ictxt, np,me
+  integer(psb_ipk_) :: counter, proc, i, &
+       &     n_el_send,n_el_recv,&
+       &     n_elem, j, ipx,mat_recv, idxs,idxr,nz,&
+       &     data_,totxch,nxs, nxr
+  integer(psb_lpk_) :: r, k, irmin, irmax, icmin, icmax, iszs, iszr, &
+       & lidx, l1, lnr, lnc, idx, ngtz, tot_elem
+  integer(psb_mpk_) :: icomm, minfo
+  integer(psb_mpk_), allocatable  :: brvindx(:), &
+       & rvsz(:), bsdindx(:),sdsz(:)
+  integer(psb_lpk_), allocatable  :: iasnd(:), jasnd(:)
+  real(psb_dpk_), allocatable :: valsnd(:)
+  type(psb_ld_coo_sparse_mat), allocatable :: acoo
+  integer(psb_ipk_), pointer  :: idxv(:)
+  class(psb_i_base_vect_type), pointer :: pdxv
+  integer(psb_ipk_), allocatable :: ipdxv(:)
+  logical           :: rowcnv_,colcnv_,rowscale_,colscale_
+  character(len=5)  :: outfmt_
+  integer(psb_ipk_) :: debug_level, debug_unit, err_act
+  character(len=20) :: name, ch_err
+
+  info=psb_success_
+  name='psb_dsphalo'
+  call psb_erractionsave(err_act)
+  if (psb_errstatus_fatal()) then
+    info = psb_err_internal_error_ ;    goto 9999
+  end if
+  debug_unit  = psb_get_debug_unit()
+  debug_level = psb_get_debug_level()
+
+  ictxt = desc_a%get_context()
+  icomm = desc_a%get_mpic()
+
+  Call psb_info(ictxt, me, np)
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),': Start'
+
+  if (present(rowcnv)) then 
+    rowcnv_ = rowcnv
+  else
+    rowcnv_ = .true.
+  endif
+  if (present(colcnv)) then 
+    colcnv_ = colcnv
+  else
+    colcnv_ = .true.
+  endif
+  if (present(rowscale)) then 
+    rowscale_ = rowscale
+  else
+    rowscale_ = .false.
+  endif
+  if (present(colscale)) then 
+    colscale_ = colscale
+  else
+    colscale_ = .false.
+  endif
+  if (present(data)) then 
+    data_ = data
+  else
+    data_ = psb_comm_halo_
+  endif
+
+  if (present(outfmt)) then 
+    outfmt_ =  psb_toupper(outfmt)
+  else
+    outfmt_ = 'CSR'
+  endif
+
+  Allocate(brvindx(np+1),&
+       & rvsz(np),sdsz(np),bsdindx(np+1), acoo,stat=info)
+
+  if (info /= psb_success_) then
+    info=psb_err_alloc_dealloc_
+    call psb_errpush(info,name)
+    goto 9999
+  end if
+
+  If (debug_level >= psb_debug_outer_)&
+       & write(debug_unit,*) me,' ',trim(name),': Data selector',data_
+
+  select case(data_) 
+  case(psb_comm_halo_,psb_comm_ext_ ) 
+    ! Do not accept OVRLAP_INDEX any longer. 
+  case default
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='wrong Data selector')
+    goto 9999
+  end select
+
+
+  sdsz(:)=0
+  rvsz(:)=0
+  l1  = 0
+  ipx = 1
+  brvindx(ipx) = 0
+  bsdindx(ipx) = 0
+  counter=1
+  idx = 0
+  idxs = 0
+  idxr = 0
+  lnc = a%get_ncols()
+  call acoo%allocate(lzero,lnc)
+
+
+  call desc_a%get_list(data_,pdxv,totxch,nxr,nxs,info)
+  ipdxv = pdxv%get_vect()
+  ! For all rows in the halo descriptor, extract and send/receive.
+  Do 
+    proc=ipdxv(counter)
+    if (proc == -1) exit
+    n_el_recv = ipdxv(counter+psb_n_elem_recv_)
+    counter   = counter+n_el_recv
+    n_el_send = ipdxv(counter+psb_n_elem_send_)
+    tot_elem = 0
+    Do j=0,n_el_send-1
+      idx = ipdxv(counter+psb_elem_send_+j)
+      n_elem = a%get_nz_row(idx)
+      tot_elem = tot_elem+n_elem      
+    Enddo
+    sdsz(proc+1) = tot_elem
+    call acoo%set_nrows(acoo%get_nrows() + n_el_recv)
+    counter   = counter+n_el_send+3
+  Enddo
+
+  call mpi_alltoall(sdsz,1,psb_mpi_mpk_,& 
+       & rvsz,1,psb_mpi_mpk_,icomm,minfo)
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='mpi_alltoall'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+  idxs = 0
+  idxr = 0
+  counter = 1
+  Do 
+    proc=ipdxv(counter)
+    if (proc == -1) exit
+    n_el_recv = ipdxv(counter+psb_n_elem_recv_)
+    counter   = counter+n_el_recv
+    n_el_send = ipdxv(counter+psb_n_elem_send_)
+
+    bsdindx(proc+1) = idxs
+    idxs = idxs + sdsz(proc+1)
+    brvindx(proc+1) = idxr
+    idxr = idxr + rvsz(proc+1)
+    counter   = counter+n_el_send+3
+  Enddo
+
+  iszr=sum(rvsz)
+  call acoo%reallocate(max(iszr,1))
+  if (debug_level >= psb_debug_outer_)&
+       & write(debug_unit,*) me,' ',trim(name),': Sizes:',acoo%get_size(),&
+       & ' Send:',sdsz(:),' Receive:',rvsz(:)
+  mat_recv = iszr
+  iszs=sum(sdsz)
+  if (info == psb_success_) call psb_ensure_size(max(iszs,1),iasnd,info)
+  if (info == psb_success_) call psb_ensure_size(max(iszs,1),jasnd,info)
+  if (info == psb_success_) call psb_ensure_size(max(iszs,1),valsnd,info)
+
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_;    ch_err='psb_sp_reall'
+    call psb_errpush(info,name,a_err=ch_err);  goto 9999
+  end if
+
+  l1  = 0
+  ipx = 1
+  counter=1
+  idx = 0
+
+  tot_elem=0
+  Do 
+    proc=ipdxv(counter)
+    if (proc == -1) exit 
+    n_el_recv=ipdxv(counter+psb_n_elem_recv_)
+    counter=counter+n_el_recv
+    n_el_send=ipdxv(counter+psb_n_elem_send_)
+
+    Do j=0,n_el_send-1
+      idx = ipdxv(counter+psb_elem_send_+j)
+      n_elem = a%get_nz_row(idx)
+      call a%csget(idx,idx,ngtz,iasnd,jasnd,valsnd,info,&
+           &  append=.true.,nzin=tot_elem)
+      if (info /= psb_success_) then
+        info=psb_err_from_subroutine_
+        ch_err='psb_sp_getrow'
+        call psb_errpush(info,name,a_err=ch_err)
+        goto 9999
+      end if
+      tot_elem=tot_elem+n_elem
+    Enddo
+    ipx = ipx + 1 
+    counter   = counter+n_el_send+3
+  Enddo
+  nz = tot_elem
+
+  if (rowcnv_) call psb_loc_to_glob(iasnd(1:nz),desc_a,info,iact='I')
+  if (colcnv_) call psb_loc_to_glob(jasnd(1:nz),desc_a,info,iact='I')
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='psb_loc_to_glob'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+
+  call mpi_alltoallv(valsnd,sdsz,bsdindx,psb_mpi_r_dpk_,&
+       & acoo%val,rvsz,brvindx,psb_mpi_r_dpk_,icomm,minfo)
+  call mpi_alltoallv(iasnd,sdsz,bsdindx,psb_mpi_lpk_,&
+       & acoo%ia,rvsz,brvindx,psb_mpi_lpk_,icomm,minfo)
+  call mpi_alltoallv(jasnd,sdsz,bsdindx,psb_mpi_lpk_,&
+       & acoo%ja,rvsz,brvindx,psb_mpi_lpk_,icomm,minfo)
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='mpi_alltoallv'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+  !
+  ! Convert into local numbering 
+  !
+  if (rowcnv_) call psb_glob_to_loc(acoo%ia(1:iszr),desc_a,info,iact='I')
+  if (colcnv_) call psb_glob_to_loc(acoo%ja(1:iszr),desc_a,info,iact='I')
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='psbglob_to_loc'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+  l1  = 0
+  call acoo%set_nrows(lzero)
+  !
+  irmin = huge(irmin)
+  icmin = huge(icmin)
+  irmax = 0
+  icmax = 0
+  Do i=1,iszr
+    r=(acoo%ia(i))
+    k=(acoo%ja(i))
+    ! Just in case some of the conversions were out-of-range
+    If ((r>0).and.(k>0)) Then
+      l1=l1+1
+      acoo%val(l1) = acoo%val(i)
+      acoo%ia(l1)  = r 
+      acoo%ja(l1)  = k
+      irmin = min(irmin,r)
+      irmax = max(irmax,r)
+      icmin = min(icmin,k)
+      icmax = max(icmax,k)
+    End If
+  Enddo
+  if (rowscale_) then 
+    call acoo%set_nrows(max(irmax-irmin+1,0))
+    acoo%ia(1:l1) = acoo%ia(1:l1) - irmin + 1
+  else    
+    call acoo%set_nrows(irmax)
+  end if
+  if (colscale_) then 
+    call acoo%set_ncols(max(icmax-icmin+1,0))
+    acoo%ja(1:l1) = acoo%ja(1:l1) - icmin + 1
+  else
+    call acoo%set_ncols(icmax)
+  end if
+
+  call acoo%set_nzeros(l1)
+  call acoo%set_sorted(.false.)
+
+  if (debug_level >= psb_debug_outer_)&
+       & write(debug_unit,*) me,' ',trim(name),&
+       & ': End data exchange',counter,l1
+
+  call move_alloc(acoo,blk%a)
+
+  ! Do we expect any duplicates to appear???? 
+  call blk%cscnv(info,type=outfmt_,dupl=psb_dupl_add_)
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='psb_spcnv'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+  Deallocate(brvindx,bsdindx,rvsz,sdsz,&
+       & iasnd,jasnd,valsnd,stat=info)
+  if (debug_level >= psb_debug_outer_)&
+       & write(debug_unit,*) me,' ',trim(name),': Done'
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(ictxt,err_act)
+
+  return
+
+End Subroutine psb_ldsphalo
diff --git a/base/tools/psb_ssphalo.F90 b/base/tools/psb_ssphalo.F90
index 8053e42b..23b6e6ec 100644
--- a/base/tools/psb_ssphalo.F90
+++ b/base/tools/psb_ssphalo.F90
@@ -182,7 +182,7 @@ Subroutine psb_ssphalo(a,desc_a,blk,info,rowcnv,colcnv,&
   idxs = 0
   idxr = 0
 
-  call acoo%allocate(izero,a%get_ncols(),info)
+  call acoo%allocate(izero,a%get_ncols())
 
 
   call desc_a%get_list(data_,pdxv,totxch,nxr,nxs,info)
@@ -467,3 +467,324 @@ Subroutine psb_ssphalo(a,desc_a,blk,info,rowcnv,colcnv,&
   return
 
 End Subroutine psb_ssphalo
+
+
+Subroutine psb_lssphalo(a,desc_a,blk,info,rowcnv,colcnv,&
+     &  rowscale,colscale,outfmt,data)
+  use psb_base_mod, psb_protect_name => psb_lssphalo
+
+#ifdef MPI_MOD
+  use mpi
+#endif
+  Implicit None
+#ifdef MPI_H
+  include 'mpif.h'
+#endif
+
+  Type(psb_lsspmat_type),Intent(in)    :: a
+  Type(psb_lsspmat_type),Intent(inout) :: blk
+  Type(psb_desc_type),Intent(in), target :: desc_a
+  integer(psb_ipk_), intent(out)                :: info
+  logical, optional, intent(in)       :: rowcnv,colcnv,rowscale,colscale
+  character(len=5), optional          :: outfmt 
+  integer(psb_ipk_), intent(in), optional       :: data
+  !     ...local scalars....
+  integer(psb_ipk_) :: ictxt, np,me
+  integer(psb_ipk_) :: counter, proc, i, &
+       &     n_el_send,n_el_recv,&
+       &     n_elem, j, ipx,mat_recv, idxs,idxr,nz,&
+       &     data_,totxch,nxs, nxr
+  integer(psb_lpk_) :: r, k, irmin, irmax, icmin, icmax, iszs, iszr, &
+       & lidx, l1, lnr, lnc, idx, ngtz, tot_elem
+  integer(psb_mpk_) :: icomm, minfo
+  integer(psb_mpk_), allocatable  :: brvindx(:), &
+       & rvsz(:), bsdindx(:),sdsz(:)
+  integer(psb_lpk_), allocatable  :: iasnd(:), jasnd(:)
+  real(psb_spk_), allocatable :: valsnd(:)
+  type(psb_ls_coo_sparse_mat), allocatable :: acoo
+  integer(psb_ipk_), pointer  :: idxv(:)
+  class(psb_i_base_vect_type), pointer :: pdxv
+  integer(psb_ipk_), allocatable :: ipdxv(:)
+  logical           :: rowcnv_,colcnv_,rowscale_,colscale_
+  character(len=5)  :: outfmt_
+  integer(psb_ipk_) :: debug_level, debug_unit, err_act
+  character(len=20) :: name, ch_err
+
+  info=psb_success_
+  name='psb_ssphalo'
+  call psb_erractionsave(err_act)
+  if (psb_errstatus_fatal()) then
+    info = psb_err_internal_error_ ;    goto 9999
+  end if
+  debug_unit  = psb_get_debug_unit()
+  debug_level = psb_get_debug_level()
+
+  ictxt = desc_a%get_context()
+  icomm = desc_a%get_mpic()
+
+  Call psb_info(ictxt, me, np)
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),': Start'
+
+  if (present(rowcnv)) then 
+    rowcnv_ = rowcnv
+  else
+    rowcnv_ = .true.
+  endif
+  if (present(colcnv)) then 
+    colcnv_ = colcnv
+  else
+    colcnv_ = .true.
+  endif
+  if (present(rowscale)) then 
+    rowscale_ = rowscale
+  else
+    rowscale_ = .false.
+  endif
+  if (present(colscale)) then 
+    colscale_ = colscale
+  else
+    colscale_ = .false.
+  endif
+  if (present(data)) then 
+    data_ = data
+  else
+    data_ = psb_comm_halo_
+  endif
+
+  if (present(outfmt)) then 
+    outfmt_ =  psb_toupper(outfmt)
+  else
+    outfmt_ = 'CSR'
+  endif
+
+  Allocate(brvindx(np+1),&
+       & rvsz(np),sdsz(np),bsdindx(np+1), acoo,stat=info)
+
+  if (info /= psb_success_) then
+    info=psb_err_alloc_dealloc_
+    call psb_errpush(info,name)
+    goto 9999
+  end if
+
+  If (debug_level >= psb_debug_outer_)&
+       & write(debug_unit,*) me,' ',trim(name),': Data selector',data_
+
+  select case(data_) 
+  case(psb_comm_halo_,psb_comm_ext_ ) 
+    ! Do not accept OVRLAP_INDEX any longer. 
+  case default
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='wrong Data selector')
+    goto 9999
+  end select
+
+
+  sdsz(:)=0
+  rvsz(:)=0
+  l1  = 0
+  ipx = 1
+  brvindx(ipx) = 0
+  bsdindx(ipx) = 0
+  counter=1
+  idx = 0
+  idxs = 0
+  idxr = 0
+  lnc = a%get_ncols()
+  call acoo%allocate(lzero,lnc)
+
+
+  call desc_a%get_list(data_,pdxv,totxch,nxr,nxs,info)
+  ipdxv = pdxv%get_vect()
+  ! For all rows in the halo descriptor, extract and send/receive.
+  Do 
+    proc=ipdxv(counter)
+    if (proc == -1) exit
+    n_el_recv = ipdxv(counter+psb_n_elem_recv_)
+    counter   = counter+n_el_recv
+    n_el_send = ipdxv(counter+psb_n_elem_send_)
+    tot_elem = 0
+    Do j=0,n_el_send-1
+      idx = ipdxv(counter+psb_elem_send_+j)
+      n_elem = a%get_nz_row(idx)
+      tot_elem = tot_elem+n_elem      
+    Enddo
+    sdsz(proc+1) = tot_elem
+    call acoo%set_nrows(acoo%get_nrows() + n_el_recv)
+    counter   = counter+n_el_send+3
+  Enddo
+
+  call mpi_alltoall(sdsz,1,psb_mpi_mpk_,& 
+       & rvsz,1,psb_mpi_mpk_,icomm,minfo)
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='mpi_alltoall'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+  idxs = 0
+  idxr = 0
+  counter = 1
+  Do 
+    proc=ipdxv(counter)
+    if (proc == -1) exit
+    n_el_recv = ipdxv(counter+psb_n_elem_recv_)
+    counter   = counter+n_el_recv
+    n_el_send = ipdxv(counter+psb_n_elem_send_)
+
+    bsdindx(proc+1) = idxs
+    idxs = idxs + sdsz(proc+1)
+    brvindx(proc+1) = idxr
+    idxr = idxr + rvsz(proc+1)
+    counter   = counter+n_el_send+3
+  Enddo
+
+  iszr=sum(rvsz)
+  call acoo%reallocate(max(iszr,1))
+  if (debug_level >= psb_debug_outer_)&
+       & write(debug_unit,*) me,' ',trim(name),': Sizes:',acoo%get_size(),&
+       & ' Send:',sdsz(:),' Receive:',rvsz(:)
+  mat_recv = iszr
+  iszs=sum(sdsz)
+  if (info == psb_success_) call psb_ensure_size(max(iszs,1),iasnd,info)
+  if (info == psb_success_) call psb_ensure_size(max(iszs,1),jasnd,info)
+  if (info == psb_success_) call psb_ensure_size(max(iszs,1),valsnd,info)
+
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_;    ch_err='psb_sp_reall'
+    call psb_errpush(info,name,a_err=ch_err);  goto 9999
+  end if
+
+  l1  = 0
+  ipx = 1
+  counter=1
+  idx = 0
+
+  tot_elem=0
+  Do 
+    proc=ipdxv(counter)
+    if (proc == -1) exit 
+    n_el_recv=ipdxv(counter+psb_n_elem_recv_)
+    counter=counter+n_el_recv
+    n_el_send=ipdxv(counter+psb_n_elem_send_)
+
+    Do j=0,n_el_send-1
+      idx = ipdxv(counter+psb_elem_send_+j)
+      n_elem = a%get_nz_row(idx)
+      call a%csget(idx,idx,ngtz,iasnd,jasnd,valsnd,info,&
+           &  append=.true.,nzin=tot_elem)
+      if (info /= psb_success_) then
+        info=psb_err_from_subroutine_
+        ch_err='psb_sp_getrow'
+        call psb_errpush(info,name,a_err=ch_err)
+        goto 9999
+      end if
+      tot_elem=tot_elem+n_elem
+    Enddo
+    ipx = ipx + 1 
+    counter   = counter+n_el_send+3
+  Enddo
+  nz = tot_elem
+
+  if (rowcnv_) call psb_loc_to_glob(iasnd(1:nz),desc_a,info,iact='I')
+  if (colcnv_) call psb_loc_to_glob(jasnd(1:nz),desc_a,info,iact='I')
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='psb_loc_to_glob'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+
+  call mpi_alltoallv(valsnd,sdsz,bsdindx,psb_mpi_r_spk_,&
+       & acoo%val,rvsz,brvindx,psb_mpi_r_spk_,icomm,minfo)
+  call mpi_alltoallv(iasnd,sdsz,bsdindx,psb_mpi_lpk_,&
+       & acoo%ia,rvsz,brvindx,psb_mpi_lpk_,icomm,minfo)
+  call mpi_alltoallv(jasnd,sdsz,bsdindx,psb_mpi_lpk_,&
+       & acoo%ja,rvsz,brvindx,psb_mpi_lpk_,icomm,minfo)
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='mpi_alltoallv'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+  !
+  ! Convert into local numbering 
+  !
+  if (rowcnv_) call psb_glob_to_loc(acoo%ia(1:iszr),desc_a,info,iact='I')
+  if (colcnv_) call psb_glob_to_loc(acoo%ja(1:iszr),desc_a,info,iact='I')
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='psbglob_to_loc'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+  l1  = 0
+  call acoo%set_nrows(lzero)
+  !
+  irmin = huge(irmin)
+  icmin = huge(icmin)
+  irmax = 0
+  icmax = 0
+  Do i=1,iszr
+    r=(acoo%ia(i))
+    k=(acoo%ja(i))
+    ! Just in case some of the conversions were out-of-range
+    If ((r>0).and.(k>0)) Then
+      l1=l1+1
+      acoo%val(l1) = acoo%val(i)
+      acoo%ia(l1)  = r 
+      acoo%ja(l1)  = k
+      irmin = min(irmin,r)
+      irmax = max(irmax,r)
+      icmin = min(icmin,k)
+      icmax = max(icmax,k)
+    End If
+  Enddo
+  if (rowscale_) then 
+    call acoo%set_nrows(max(irmax-irmin+1,0))
+    acoo%ia(1:l1) = acoo%ia(1:l1) - irmin + 1
+  else    
+    call acoo%set_nrows(irmax)
+  end if
+  if (colscale_) then 
+    call acoo%set_ncols(max(icmax-icmin+1,0))
+    acoo%ja(1:l1) = acoo%ja(1:l1) - icmin + 1
+  else
+    call acoo%set_ncols(icmax)
+  end if
+
+  call acoo%set_nzeros(l1)
+  call acoo%set_sorted(.false.)
+
+  if (debug_level >= psb_debug_outer_)&
+       & write(debug_unit,*) me,' ',trim(name),&
+       & ': End data exchange',counter,l1
+
+  call move_alloc(acoo,blk%a)
+
+  ! Do we expect any duplicates to appear???? 
+  call blk%cscnv(info,type=outfmt_,dupl=psb_dupl_add_)
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='psb_spcnv'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+  Deallocate(brvindx,bsdindx,rvsz,sdsz,&
+       & iasnd,jasnd,valsnd,stat=info)
+  if (debug_level >= psb_debug_outer_)&
+       & write(debug_unit,*) me,' ',trim(name),': Done'
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(ictxt,err_act)
+
+  return
+
+End Subroutine psb_lssphalo
diff --git a/base/tools/psb_zsphalo.F90 b/base/tools/psb_zsphalo.F90
index 2dffbe1d..25f2c180 100644
--- a/base/tools/psb_zsphalo.F90
+++ b/base/tools/psb_zsphalo.F90
@@ -182,7 +182,7 @@ Subroutine psb_zsphalo(a,desc_a,blk,info,rowcnv,colcnv,&
   idxs = 0
   idxr = 0
 
-  call acoo%allocate(izero,a%get_ncols(),info)
+  call acoo%allocate(izero,a%get_ncols())
 
 
   call desc_a%get_list(data_,pdxv,totxch,nxr,nxs,info)
@@ -467,3 +467,324 @@ Subroutine psb_zsphalo(a,desc_a,blk,info,rowcnv,colcnv,&
   return
 
 End Subroutine psb_zsphalo
+
+
+Subroutine psb_lzsphalo(a,desc_a,blk,info,rowcnv,colcnv,&
+     &  rowscale,colscale,outfmt,data)
+  use psb_base_mod, psb_protect_name => psb_lzsphalo
+
+#ifdef MPI_MOD
+  use mpi
+#endif
+  Implicit None
+#ifdef MPI_H
+  include 'mpif.h'
+#endif
+
+  Type(psb_lzspmat_type),Intent(in)    :: a
+  Type(psb_lzspmat_type),Intent(inout) :: blk
+  Type(psb_desc_type),Intent(in), target :: desc_a
+  integer(psb_ipk_), intent(out)                :: info
+  logical, optional, intent(in)       :: rowcnv,colcnv,rowscale,colscale
+  character(len=5), optional          :: outfmt 
+  integer(psb_ipk_), intent(in), optional       :: data
+  !     ...local scalars....
+  integer(psb_ipk_) :: ictxt, np,me
+  integer(psb_ipk_) :: counter, proc, i, &
+       &     n_el_send,n_el_recv,&
+       &     n_elem, j, ipx,mat_recv, idxs,idxr,nz,&
+       &     data_,totxch,nxs, nxr
+  integer(psb_lpk_) :: r, k, irmin, irmax, icmin, icmax, iszs, iszr, &
+       & lidx, l1, lnr, lnc, idx, ngtz, tot_elem
+  integer(psb_mpk_) :: icomm, minfo
+  integer(psb_mpk_), allocatable  :: brvindx(:), &
+       & rvsz(:), bsdindx(:),sdsz(:)
+  integer(psb_lpk_), allocatable  :: iasnd(:), jasnd(:)
+  complex(psb_dpk_), allocatable :: valsnd(:)
+  type(psb_lz_coo_sparse_mat), allocatable :: acoo
+  integer(psb_ipk_), pointer  :: idxv(:)
+  class(psb_i_base_vect_type), pointer :: pdxv
+  integer(psb_ipk_), allocatable :: ipdxv(:)
+  logical           :: rowcnv_,colcnv_,rowscale_,colscale_
+  character(len=5)  :: outfmt_
+  integer(psb_ipk_) :: debug_level, debug_unit, err_act
+  character(len=20) :: name, ch_err
+
+  info=psb_success_
+  name='psb_zsphalo'
+  call psb_erractionsave(err_act)
+  if (psb_errstatus_fatal()) then
+    info = psb_err_internal_error_ ;    goto 9999
+  end if
+  debug_unit  = psb_get_debug_unit()
+  debug_level = psb_get_debug_level()
+
+  ictxt = desc_a%get_context()
+  icomm = desc_a%get_mpic()
+
+  Call psb_info(ictxt, me, np)
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),': Start'
+
+  if (present(rowcnv)) then 
+    rowcnv_ = rowcnv
+  else
+    rowcnv_ = .true.
+  endif
+  if (present(colcnv)) then 
+    colcnv_ = colcnv
+  else
+    colcnv_ = .true.
+  endif
+  if (present(rowscale)) then 
+    rowscale_ = rowscale
+  else
+    rowscale_ = .false.
+  endif
+  if (present(colscale)) then 
+    colscale_ = colscale
+  else
+    colscale_ = .false.
+  endif
+  if (present(data)) then 
+    data_ = data
+  else
+    data_ = psb_comm_halo_
+  endif
+
+  if (present(outfmt)) then 
+    outfmt_ =  psb_toupper(outfmt)
+  else
+    outfmt_ = 'CSR'
+  endif
+
+  Allocate(brvindx(np+1),&
+       & rvsz(np),sdsz(np),bsdindx(np+1), acoo,stat=info)
+
+  if (info /= psb_success_) then
+    info=psb_err_alloc_dealloc_
+    call psb_errpush(info,name)
+    goto 9999
+  end if
+
+  If (debug_level >= psb_debug_outer_)&
+       & write(debug_unit,*) me,' ',trim(name),': Data selector',data_
+
+  select case(data_) 
+  case(psb_comm_halo_,psb_comm_ext_ ) 
+    ! Do not accept OVRLAP_INDEX any longer. 
+  case default
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='wrong Data selector')
+    goto 9999
+  end select
+
+
+  sdsz(:)=0
+  rvsz(:)=0
+  l1  = 0
+  ipx = 1
+  brvindx(ipx) = 0
+  bsdindx(ipx) = 0
+  counter=1
+  idx = 0
+  idxs = 0
+  idxr = 0
+  lnc = a%get_ncols()
+  call acoo%allocate(lzero,lnc)
+
+
+  call desc_a%get_list(data_,pdxv,totxch,nxr,nxs,info)
+  ipdxv = pdxv%get_vect()
+  ! For all rows in the halo descriptor, extract and send/receive.
+  Do 
+    proc=ipdxv(counter)
+    if (proc == -1) exit
+    n_el_recv = ipdxv(counter+psb_n_elem_recv_)
+    counter   = counter+n_el_recv
+    n_el_send = ipdxv(counter+psb_n_elem_send_)
+    tot_elem = 0
+    Do j=0,n_el_send-1
+      idx = ipdxv(counter+psb_elem_send_+j)
+      n_elem = a%get_nz_row(idx)
+      tot_elem = tot_elem+n_elem      
+    Enddo
+    sdsz(proc+1) = tot_elem
+    call acoo%set_nrows(acoo%get_nrows() + n_el_recv)
+    counter   = counter+n_el_send+3
+  Enddo
+
+  call mpi_alltoall(sdsz,1,psb_mpi_mpk_,& 
+       & rvsz,1,psb_mpi_mpk_,icomm,minfo)
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='mpi_alltoall'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+  idxs = 0
+  idxr = 0
+  counter = 1
+  Do 
+    proc=ipdxv(counter)
+    if (proc == -1) exit
+    n_el_recv = ipdxv(counter+psb_n_elem_recv_)
+    counter   = counter+n_el_recv
+    n_el_send = ipdxv(counter+psb_n_elem_send_)
+
+    bsdindx(proc+1) = idxs
+    idxs = idxs + sdsz(proc+1)
+    brvindx(proc+1) = idxr
+    idxr = idxr + rvsz(proc+1)
+    counter   = counter+n_el_send+3
+  Enddo
+
+  iszr=sum(rvsz)
+  call acoo%reallocate(max(iszr,1))
+  if (debug_level >= psb_debug_outer_)&
+       & write(debug_unit,*) me,' ',trim(name),': Sizes:',acoo%get_size(),&
+       & ' Send:',sdsz(:),' Receive:',rvsz(:)
+  mat_recv = iszr
+  iszs=sum(sdsz)
+  if (info == psb_success_) call psb_ensure_size(max(iszs,1),iasnd,info)
+  if (info == psb_success_) call psb_ensure_size(max(iszs,1),jasnd,info)
+  if (info == psb_success_) call psb_ensure_size(max(iszs,1),valsnd,info)
+
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_;    ch_err='psb_sp_reall'
+    call psb_errpush(info,name,a_err=ch_err);  goto 9999
+  end if
+
+  l1  = 0
+  ipx = 1
+  counter=1
+  idx = 0
+
+  tot_elem=0
+  Do 
+    proc=ipdxv(counter)
+    if (proc == -1) exit 
+    n_el_recv=ipdxv(counter+psb_n_elem_recv_)
+    counter=counter+n_el_recv
+    n_el_send=ipdxv(counter+psb_n_elem_send_)
+
+    Do j=0,n_el_send-1
+      idx = ipdxv(counter+psb_elem_send_+j)
+      n_elem = a%get_nz_row(idx)
+      call a%csget(idx,idx,ngtz,iasnd,jasnd,valsnd,info,&
+           &  append=.true.,nzin=tot_elem)
+      if (info /= psb_success_) then
+        info=psb_err_from_subroutine_
+        ch_err='psb_sp_getrow'
+        call psb_errpush(info,name,a_err=ch_err)
+        goto 9999
+      end if
+      tot_elem=tot_elem+n_elem
+    Enddo
+    ipx = ipx + 1 
+    counter   = counter+n_el_send+3
+  Enddo
+  nz = tot_elem
+
+  if (rowcnv_) call psb_loc_to_glob(iasnd(1:nz),desc_a,info,iact='I')
+  if (colcnv_) call psb_loc_to_glob(jasnd(1:nz),desc_a,info,iact='I')
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='psb_loc_to_glob'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+
+  call mpi_alltoallv(valsnd,sdsz,bsdindx,psb_mpi_c_dpk_,&
+       & acoo%val,rvsz,brvindx,psb_mpi_c_dpk_,icomm,minfo)
+  call mpi_alltoallv(iasnd,sdsz,bsdindx,psb_mpi_lpk_,&
+       & acoo%ia,rvsz,brvindx,psb_mpi_lpk_,icomm,minfo)
+  call mpi_alltoallv(jasnd,sdsz,bsdindx,psb_mpi_lpk_,&
+       & acoo%ja,rvsz,brvindx,psb_mpi_lpk_,icomm,minfo)
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='mpi_alltoallv'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+  !
+  ! Convert into local numbering 
+  !
+  if (rowcnv_) call psb_glob_to_loc(acoo%ia(1:iszr),desc_a,info,iact='I')
+  if (colcnv_) call psb_glob_to_loc(acoo%ja(1:iszr),desc_a,info,iact='I')
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='psbglob_to_loc'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+  l1  = 0
+  call acoo%set_nrows(lzero)
+  !
+  irmin = huge(irmin)
+  icmin = huge(icmin)
+  irmax = 0
+  icmax = 0
+  Do i=1,iszr
+    r=(acoo%ia(i))
+    k=(acoo%ja(i))
+    ! Just in case some of the conversions were out-of-range
+    If ((r>0).and.(k>0)) Then
+      l1=l1+1
+      acoo%val(l1) = acoo%val(i)
+      acoo%ia(l1)  = r 
+      acoo%ja(l1)  = k
+      irmin = min(irmin,r)
+      irmax = max(irmax,r)
+      icmin = min(icmin,k)
+      icmax = max(icmax,k)
+    End If
+  Enddo
+  if (rowscale_) then 
+    call acoo%set_nrows(max(irmax-irmin+1,0))
+    acoo%ia(1:l1) = acoo%ia(1:l1) - irmin + 1
+  else    
+    call acoo%set_nrows(irmax)
+  end if
+  if (colscale_) then 
+    call acoo%set_ncols(max(icmax-icmin+1,0))
+    acoo%ja(1:l1) = acoo%ja(1:l1) - icmin + 1
+  else
+    call acoo%set_ncols(icmax)
+  end if
+
+  call acoo%set_nzeros(l1)
+  call acoo%set_sorted(.false.)
+
+  if (debug_level >= psb_debug_outer_)&
+       & write(debug_unit,*) me,' ',trim(name),&
+       & ': End data exchange',counter,l1
+
+  call move_alloc(acoo,blk%a)
+
+  ! Do we expect any duplicates to appear???? 
+  call blk%cscnv(info,type=outfmt_,dupl=psb_dupl_add_)
+  if (info /= psb_success_) then
+    info=psb_err_from_subroutine_
+    ch_err='psb_spcnv'
+    call psb_errpush(info,name,a_err=ch_err)
+    goto 9999
+  end if
+
+  Deallocate(brvindx,bsdindx,rvsz,sdsz,&
+       & iasnd,jasnd,valsnd,stat=info)
+  if (debug_level >= psb_debug_outer_)&
+       & write(debug_unit,*) me,' ',trim(name),': Done'
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(ictxt,err_act)
+
+  return
+
+End Subroutine psb_lzsphalo