! ! ! 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. ! ! program amg_sf_sample use psb_base_mod use amg_prec_mod use psb_krylov_mod use psb_util_mod use data_input implicit none ! input parameters character(len=40) :: kmethd, mtrx_file, rhs_file, guess_file, sol_file, part character(len=2) :: filefmt ! Krylov solver data type solverdata character(len=40) :: kmethd ! Krylov solver integer(psb_ipk_) :: istopc ! stopping criterion integer(psb_ipk_) :: itmax ! maximum number of iterations integer(psb_ipk_) :: itrace ! tracing integer(psb_ipk_) :: irst ! restart real(psb_spk_) :: eps ! stopping tolerance end type solverdata type(solverdata) :: s_choice ! preconditioner data type precdata ! preconditioner type character(len=40) :: descr ! verbose description of the prec character(len=10) :: ptype ! preconditioner type 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 ! 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_ord ! ordering for aggregation: NATURAL, DEGREE character(len=16) :: 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_) :: csize ! minimum size of coarsest matrix ! 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 integer(psb_ipk_) :: fill ! fill-in for incomplete LU factorization 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 integer(psb_ipk_) :: fill2 ! fill-in for incomplete LU factorization 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 end type precdata type(precdata) :: p_choice ! sparse matrices type(psb_sspmat_type) :: a type(psb_lsspmat_type) :: aux_a ! preconditioner data type(amg_sprec_type) :: prec ! dense matrices real(psb_spk_), allocatable, target :: aux_b(:,:), d(:), aux_g(:,:), aux_x(:,:) real(psb_spk_), allocatable , save :: x_col_glob(:), r_col_glob(:) real(psb_spk_), pointer :: b_col_glob(:), ref_col_glob(:), guess_col_glob(:) type(psb_s_vect_type) :: b_col, x_col, r_col, ref_col ! communications data structure type(psb_desc_type):: desc_a type(psb_ctxt_type) :: ctxt integer(psb_ipk_) :: iam, np integer(psb_lpk_) :: lnp ! solver paramters integer(psb_ipk_) :: iter, ircode, nlv integer(psb_epk_) :: amatsize, precsize, descsize real(psb_spk_) :: err character(len=5) :: afmt character(len=20) :: name, renum integer(psb_ipk_), parameter :: iunit=12 integer(psb_ipk_) :: iparm(20) ! other variables integer(psb_ipk_) :: i, info, j, k, m_problem integer(psb_lpk_) :: lbw, ubw, prf real(psb_dpk_) :: t1, t2, tprec, thier, tslv real(psb_spk_) :: resmx, resmxp, xdiffn2, xdiffni, xni, xn2 integer(psb_ipk_) :: nrhs, nv integer(psb_ipk_), allocatable :: ivg(:), ipv(:) integer(psb_lpk_), allocatable :: perm(:) logical :: have_guess=.false., have_ref=.false. call psb_init(ctxt) call psb_info(ctxt,iam,np) if (iam < 0) then ! This should not happen, but just in case call psb_exit(ctxt) stop endif name='amg_sf_sample' if(psb_get_errstatus() /= 0) goto 9999 info=psb_success_ call psb_set_errverbosity(itwo) ! ! Hello world ! if (iam == psb_root_) then write(psb_out_unit,*) ' ' write(psb_out_unit,*) 'Welcome to MLD2P4 version: ',amg_version_string_ write(psb_out_unit,*) 'This is the ',trim(name),' sample test program' write(psb_out_unit,*) ' ' end if ! ! get parameters ! call get_parms(ctxt,mtrx_file,rhs_file,guess_file,sol_file,filefmt, & & part,afmt,s_choice,p_choice) call psb_barrier(ctxt) t1 = psb_wtime() ! read the input matrix to be processed and (possibly) the rhs, ! the initial guess and the reference solution nrhs = 1 if (iam == psb_root_) then select case(psb_toupper(filefmt)) case('MM') ! For Matrix Market we have an input file for the matrix ! and (optional) separate files for the rhs, the initial guess ! and the reference solution call mm_mat_read(aux_a,info,iunit=iunit,filename=mtrx_file) if ((info == psb_success_).and.(rhs_file /= 'NONE')) & & call mm_array_read(aux_b,info,iunit=iunit,filename=rhs_file) if ((info == psb_success_).and.(guess_file /= 'NONE')) then call mm_array_read(aux_g,info,iunit=iunit,filename=guess_file) have_guess = .true. end if if ((info == psb_success_).and.(sol_file /= 'NONE')) then call mm_array_read(aux_x,info,iunit=iunit,filename=sol_file) have_ref = .true. end if case ('HB') ! For Harwell-Boeing we have a single file which may or may not ! contain rhs, initial guess and reference solution. call hb_read(aux_a,info,iunit=iunit,b=aux_b,& & g=aux_g,x=aux_x,filename=mtrx_file) have_guess = allocated(aux_g) have_ref = allocated(aux_x) case default info = -1 write(psb_err_unit,*) 'Wrong choice for fileformat ', filefmt end select if (info /= psb_success_) then write(psb_err_unit,*) 'Error while reading input matrix ' call psb_abort(ctxt) end if m_problem = aux_a%get_nrows() call psb_bcast(ctxt,m_problem) call psb_bcast(ctxt,have_guess) call psb_bcast(ctxt,have_ref) ! At this point aux_b may still be unallocated if (psb_size(aux_b,dim=ione) == m_problem) then ! if any rhs were present, broadcast the first one write(psb_err_unit,'("Ok, got an rhs ")') b_col_glob =>aux_b(:,1) else write(psb_out_unit,'("Generating an rhs...")') call psb_realloc(m_problem,1,aux_b,ircode) if (ircode /= 0) then call psb_errpush(psb_err_alloc_dealloc_,name) goto 9999 endif b_col_glob => aux_b(:,1) do i=1, m_problem b_col_glob(i) = 1.d0 enddo endif if ((have_guess).and.(psb_size(aux_g,dim=ione) == m_problem)) then ! if any initial guess were present, broadcast the first one write(psb_err_unit,'("Ok, got an initial guess ")') guess_col_glob =>aux_g(:,1) else write(psb_out_unit,'("Generating an initial guess...")') call psb_realloc(m_problem,1,aux_g,ircode) if (ircode /= 0) then call psb_errpush(psb_err_alloc_dealloc_,name) goto 9999 endif guess_col_glob => aux_g(:,1) do i=1, m_problem guess_col_glob(i) = 0.d0 enddo endif if ((have_ref).and.(psb_size(aux_x,dim=ione) == m_problem)) then ! if any reference were present, broadcast the first one write(psb_err_unit,'("Ok, got a reference solution ")') ref_col_glob =>aux_x(:,1) else write(psb_out_unit,'("No reference solution...")') endif ! clean zeros in the input matrix call aux_a%clean_zeros(info) else call psb_bcast(ctxt,m_problem) call psb_bcast(ctxt,have_guess) call psb_bcast(ctxt,have_ref) end if ! ! Renumbering (NONE for the moment) ! if (iam==psb_root_) then renum='NONE' call psb_cmp_bwpf(aux_a,lbw,ubw,prf,info) write(psb_out_unit,'(" ")') write(psb_out_unit,*) 'Bandwidth and profile: ',lbw,ubw,prf write(psb_out_unit,*) 'Renumbering algorithm: ',psb_toupper(renum) if (trim(psb_toupper(renum))/='NONE') then call psb_mat_renum(renum,aux_a,info,perm=perm) if (info /= 0) then write(psb_err_unit,*) 'Error from RENUM',info goto 9999 end if call psb_gelp('N',perm(1:m_problem),b_col_glob(1:m_problem),info) call psb_cmp_bwpf(aux_a,lbw,ubw,prf,info) write(psb_out_unit,*) 'Bandwidth and profile (renumberd):',lbw,ubw,prf end if write(psb_out_unit,'(" ")') end if ! ! switch over different partition types ! select case (psb_toupper(part)) case('BLOCK') call psb_barrier(ctxt) if (iam == psb_root_) write(psb_out_unit,'("Partition type: block")') call psb_matdist(aux_a, a, ctxt, desc_a,info,fmt=afmt,parts=part_block) case('GRAPH') if (iam == psb_root_) then write(psb_out_unit,'("Partition type: graph")') write(psb_out_unit,'(" ")') ! write(psb_err_unit,'("Build type: graph")') call aux_a%cscnv(info,type='csr') lnp = np call build_mtpart(aux_a,lnp) endif call distr_mtpart(psb_root_,ctxt) call getv_mtpart(ivg) call psb_matdist(aux_a, a, ctxt,desc_a,info,fmt=afmt,vg=ivg) case default if (iam == psb_root_) write(psb_out_unit,'("Partition type: block")') call psb_matdist(aux_a, a, ctxt, desc_a,info,fmt=afmt,parts=part_block) end select ! ! Scatter rhs, initial guess and reference solution ! call psb_geall(b_col,desc_a,info) call psb_geall(x_col,desc_a,info) if (have_ref) call psb_geall(ref_col,desc_a,info) if (iam == psb_root_) write(psb_out_unit,'("Scatter rhs")') call psb_scatter(b_col_glob,b_col,desc_a,info) if (iam == psb_root_) write(psb_out_unit,'("Scatter initial guess")') call psb_scatter(guess_col_glob,x_col,desc_a,info) if (have_ref) then if (iam == psb_root_) write(psb_out_unit,'("Scatter reference solution")') call psb_scatter(ref_col_glob,ref_col,desc_a,info) end if t2 = psb_wtime() - t1 call psb_amx(ctxt, t2) if (iam == psb_root_) then write(psb_out_unit,'(" ")') write(psb_out_unit,'("Time to read and partition matrix, rhs(, guess, ref sol) : ",es12.5)')t2 write(psb_out_unit,'(" ")') end if ! ! initialize the preconditioner ! call prec%init(ctxt,p_choice%ptype,info) select case(trim(psb_toupper(p_choice%ptype))) case ('NONE','NOPREC') ! Do nothing, keep defaults case ('JACOBI','GS','FWGS','FBGS') ! 1-level sweeps from "outer_sweeps" call prec%set('smoother_sweeps', p_choice%jsweeps, info) case ('BJAC') call prec%set('smoother_sweeps', p_choice%jsweeps, info) call prec%set('sub_solve', p_choice%solve, info) call prec%set('sub_fillin', p_choice%fill, info) call prec%set('sub_iluthrs', p_choice%thr, info) case('AS') call prec%set('smoother_sweeps', p_choice%jsweeps, info) call prec%set('sub_ovr', p_choice%novr, info) 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('sub_fillin', p_choice%fill, info) call prec%set('sub_iluthrs', p_choice%thr, info) case ('ML') ! multilevel preconditioner call prec%set('ml_cycle', p_choice%mlcycle, info) call prec%set('outer_sweeps', p_choice%outer_sweeps,info) if (p_choice%csize>0)& & call prec%set('min_coarse_size', p_choice%csize, info) if (p_choice%mncrratio>1)& & call prec%set('min_cr_ratio', p_choice%mncrratio, info) if (p_choice%maxlevs>0)& & call prec%set('max_levs', p_choice%maxlevs, info) if (p_choice%athres >= dzero) & & call prec%set('aggr_thresh', p_choice%athres, info) if (p_choice%thrvsz>0) then do k=1,min(p_choice%thrvsz,size(prec%precv)-1) call prec%set('aggr_thresh', p_choice%athresv(k), info,ilev=(k+1)) end do end if call prec%set('aggr_prol', p_choice%aggr_prol, info) call prec%set('par_aggr_alg', p_choice%par_aggr_alg, info) call prec%set('aggr_ord', p_choice%aggr_ord, info) call prec%set('aggr_filter', p_choice%aggr_filter,info) call prec%set('smoother_type', p_choice%smther, info) call prec%set('smoother_sweeps', p_choice%jsweeps, info) select case (psb_toupper(p_choice%smther)) case ('GS','BWGS','FBGS','JACOBI') ! do nothing case default call prec%set('sub_ovr', p_choice%novr, info) 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('sub_fillin', p_choice%fill, info) call prec%set('sub_iluthrs', p_choice%thr, info) end select if (psb_toupper(p_choice%smther2) /= 'NONE') then call prec%set('smoother_type', p_choice%smther2, info,pos='post') call prec%set('smoother_sweeps', p_choice%jsweeps2, info,pos='post') select case (psb_toupper(p_choice%smther2)) case ('GS','BWGS','FBGS','JACOBI') ! do nothing case default call prec%set('sub_ovr', p_choice%novr2, info,pos='post') call prec%set('sub_restr', p_choice%restr2, info,pos='post') call prec%set('sub_prol', p_choice%prol2, info,pos='post') call prec%set('sub_solve', p_choice%solve2, info,pos='post') call prec%set('sub_fillin', p_choice%fill2, info,pos='post') call prec%set('sub_iluthrs', p_choice%thr2, info,pos='post') end select end if call prec%set('coarse_solve', p_choice%csolve, info) if (psb_toupper(p_choice%csolve) == 'BJAC') & & call prec%set('coarse_subsolve', p_choice%csbsolve, info) call prec%set('coarse_mat', p_choice%cmat, info) call prec%set('coarse_fillin', p_choice%cfill, info) call prec%set('coarse_iluthrs', p_choice%cthres, info) call prec%set('coarse_sweeps', p_choice%cjswp, info) end select ! build the preconditioner call psb_barrier(ctxt) t1 = psb_wtime() call prec%hierarchy_build(a,desc_a,info) thier = psb_wtime()-t1 if (info /= psb_success_) then call psb_errpush(psb_err_from_subroutine_,name,a_err='amg_hierarchy_bld') goto 9999 end if call psb_barrier(ctxt) t1 = psb_wtime() call prec%smoothers_build(a,desc_a,info) tprec = psb_wtime()-t1 if (info /= psb_success_) then call psb_errpush(psb_err_from_subroutine_,name,a_err='amg_smoothers_bld') goto 9999 end if call psb_amx(ctxt, thier) call psb_amx(ctxt, tprec) if(iam == psb_root_) then write(psb_out_unit,'(" ")') write(psb_out_unit,'("Preconditioner: ",a)') trim(p_choice%descr) write(psb_out_unit,'("Preconditioner time: ",es12.5)')thier+tprec write(psb_out_unit,'(" ")') end if ! ! iterative method parameters ! call psb_barrier(ctxt) t1 = psb_wtime() call psb_krylov(s_choice%kmethd,a,prec,b_col,x_col,s_choice%eps,& & desc_a,info,itmax=s_choice%itmax,iter=iter,err=err,itrace=s_choice%itrace,& & istop=s_choice%istopc,irst=s_choice%irst) call psb_barrier(ctxt) tslv = psb_wtime() - t1 call psb_amx(ctxt,tslv) ! compute residual norms call psb_geall(r_col,desc_a,info) call r_col%zero() call psb_geasb(r_col,desc_a,info) call psb_geaxpby(sone,b_col,szero,r_col,desc_a,info) call psb_spmm(-sone,a,x_col,sone,r_col,desc_a,info) resmx = psb_genrm2(r_col,desc_a,info) resmxp = psb_geamax(r_col,desc_a,info) ! compute error in solution if (have_ref) then call psb_geaxpby(-sone,x_col,sone,ref_col,desc_a,info) xdiffn2 = psb_genrm2(ref_col,desc_a,info) xdiffni = psb_geamax(ref_col,desc_a,info) xn2 = psb_genrm2(ref_col,desc_a,info) xni = psb_geamax(ref_col,desc_a,info) end if amatsize = a%sizeof() descsize = desc_a%sizeof() precsize = prec%sizeof() call psb_sum(ctxt,amatsize) call psb_sum(ctxt,descsize) call psb_sum(ctxt,precsize) call prec%descr(info,iout=psb_out_unit) if (iam == psb_root_) then write(psb_out_unit,'("Matrix: ",a)')mtrx_file write(psb_out_unit,'("Computed solution on ",i8," processors")')np write(psb_out_unit,'("Krylov method : ",a)') trim(s_choice%kmethd) write(psb_out_unit,'("Preconditioner : ",a)') trim(p_choice%descr) write(psb_out_unit,'("Iterations to convergence : ",i12)')iter write(psb_out_unit,'("Relative error estimate on exit : ",es12.5)') err write(psb_out_unit,'("Number of levels in hierarchy : ",i12)') prec%get_nlevs() write(psb_out_unit,'("Time to build hierarchy : ",es12.5)')thier write(psb_out_unit,'("Time to build smoothers : ",es12.5)')tprec write(psb_out_unit,'("Total time for preconditioner : ",es12.5)')tprec+thier write(psb_out_unit,'("Time to solve system : ",es12.5)')tslv write(psb_out_unit,'("Time per iteration : ",es12.5)')tslv/iter write(psb_out_unit,'("Total time : ",es12.5)')tslv+tprec+thier write(psb_out_unit,'("Residual 2-norm : ",es12.5)')resmx write(psb_out_unit,'("Residual inf-norm : ",es12.5)')resmxp write(psb_out_unit,'("Total memory occupation for A : ",i12)')amatsize write(psb_out_unit,'("Total memory occupation for DESC_A : ",i12)')descsize write(psb_out_unit,'("Total memory occupation for PREC : ",i12)')precsize write(psb_out_unit,'("Storage format for A : ",a )')a%get_fmt() write(psb_out_unit,'("Storage format for DESC_A : ",a )')desc_a%get_fmt() if (have_ref) then write(psb_out_unit,'(" ")') write(psb_out_unit,'(2x,a10,9x,a8,4x,a20,5x,a8)') & & '||X-XREF||','||XREF||','||X-XREF||/||XREF||','(2-norm)' write(psb_out_unit,'(1x,3(e12.6,6x))') xdiffn2,xn2,xdiffn2/xn2 write(psb_out_unit,'(" ")') write(psb_out_unit,'(2x,a10,9x,a8,4x,a20,4x,a10)') & & '||X-XREF||','||XREF||','||X-XREF||/||XREF||','(inf-norm)' write(psb_out_unit,'(1x,3(e12.6,6x))') xdiffni,xni,xdiffni/xni end if end if call psb_gather(x_col_glob,x_col,desc_a,info,root=psb_root_) if (info == psb_success_) & & call psb_gather(r_col_glob,r_col,desc_a,info,root=psb_root_) if (info /= psb_success_) goto 9999 if (iam == psb_root_) then write(psb_err_unit,'(" ")') write(psb_err_unit,'("Saving x on file")') write(20,*) 'Matrix: ',mtrx_file write(20,*) 'Krylov method:',trim(s_choice%kmethd) write(20,*) 'Preconditioner:',trim(p_choice%descr) write(20,*) 'Computed solution on ',np,' processors.' write(20,*) 'Iterations to convergence: ',iter write(20,*) 'Error estimate (infinity norm) on exit:', & & ' ||r||/||b|| (inf-norm) = ',err write(20,'(" Residual 2-norm 2 : ",es12.5)')resmx write(20,'(" Residual inf-norm : ",es12.5)')resmxp write(20,'(a8,4(2x,a20))') 'I','X(I)','R(I)','B(I)' do i=1,m_problem write(20,998) i,x_col_glob(i),r_col_glob(i),b_col_glob(i) enddo end if 998 format(i8,4(2x,g20.14)) 993 format(i6,4(1x,e12.6)) call psb_gefree(b_col,desc_a,info) call psb_gefree(x_col,desc_a,info) call psb_gefree(r_col,desc_a,info) call psb_gefree(ref_col,desc_a,info) call psb_spfree(a, desc_a,info) call prec%free(info) call psb_cdfree(desc_a,info) call psb_exit(ctxt) stop 9999 continue call psb_error(ctxt) contains ! ! get iteration parameters from standard input ! subroutine get_parms(ctxt,mtrx,rhs,guess,sol,filefmt,part,afmt,solve,prec) implicit none type(psb_ctxt_type) :: ctxt character(len=*) :: mtrx, rhs, guess, sol, filefmt, afmt, part type(solverdata) :: solve type(precdata) :: prec integer(psb_ipk_) :: iam, nm, np, inp_unit character(len=1024) :: filename call psb_info(ctxt,iam,np) if (iam == psb_root_) then ! read input data if (command_argument_count()>0) then call get_command_argument(1,filename) inp_unit = 30 open(inp_unit,file=filename,action='read',iostat=info) if (info /= 0) then write(psb_err_unit,*) 'Could not open file ',filename,' for input' call psb_abort(ctxt) stop else write(psb_err_unit,*) 'Opened file ',trim(filename),' for input' end if else inp_unit=psb_inp_unit end if ! ! input files call read_data(mtrx,inp_unit) ! matrix file call read_data(rhs,inp_unit) ! rhs file call read_data(guess,inp_unit) ! starting guess file call read_data(sol,inp_unit) ! solution file (for comparison) call read_data(filefmt,inp_unit) ! format of files call read_data(afmt,inp_unit) ! matrix storage format call read_data(part,inp_unit) ! partition type ! Krylov solver data call read_data(solve%kmethd,inp_unit) ! Krylov solver call read_data(solve%istopc,inp_unit) ! stopping criterion call read_data(solve%itmax,inp_unit) ! max num iterations call read_data(solve%itrace,inp_unit) ! tracing call read_data(solve%irst,inp_unit) ! restart call read_data(solve%eps,inp_unit) ! tolerance ! preconditioner type call read_data(prec%descr,inp_unit) ! verbose description of the prec call read_data(prec%ptype,inp_unit) ! preconditioner type ! First smoother / 1-lev preconditioner call read_data(prec%smther,inp_unit) ! smoother type call read_data(prec%jsweeps,inp_unit) ! (pre-)smoother / 1-lev prec sweeps call read_data(prec%novr,inp_unit) ! number of overlap layers 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%fill,inp_unit) ! fill-in for incomplete LU call read_data(prec%thr,inp_unit) ! threshold for ILUT ! Second smoother/ AMG post-smoother (if NONE ignored in main) call read_data(prec%smther2,inp_unit) ! smoother type call read_data(prec%jsweeps2,inp_unit) ! (post-)smoother sweeps call read_data(prec%novr2,inp_unit) ! number of overlap layers 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%fill2,inp_unit) ! fill-in for incomplete LU call read_data(prec%thr2,inp_unit) ! threshold for ILUT ! general AMG data call read_data(prec%mlcycle,inp_unit) ! AMG cycle type call read_data(prec%outer_sweeps,inp_unit) ! number of 1lev/outer sweeps call read_data(prec%maxlevs,inp_unit) ! max number of levels in AMG prec call read_data(prec%csize,inp_unit) ! min size coarsest mat ! aggregation call read_data(prec%aggr_prol,inp_unit) ! aggregation type call read_data(prec%par_aggr_alg,inp_unit) ! parallel aggregation alg call read_data(prec%aggr_ord,inp_unit) ! ordering for aggregation call read_data(prec%aggr_filter,inp_unit) ! filtering call read_data(prec%mncrratio,inp_unit) ! minimum aggregation ratio call read_data(prec%thrvsz,inp_unit) ! size of aggr thresh vector if (prec%thrvsz > 0) then call psb_realloc(prec%thrvsz,prec%athresv,info) call read_data(prec%athresv,inp_unit) ! aggr thresh vector else read(inp_unit,*) ! dummy read to skip a record end if call read_data(prec%athres,inp_unit) ! smoothed aggr thresh ! coasest-level solver call read_data(prec%csolve,inp_unit) ! coarsest-lev solver call read_data(prec%csbsolve,inp_unit) ! coarsest-lev subsolver call read_data(prec%cmat,inp_unit) ! coarsest mat layout call read_data(prec%cfill,inp_unit) ! fill-in for incompl LU call read_data(prec%cthres,inp_unit) ! Threshold for ILUT call read_data(prec%cjswp,inp_unit) ! sweeps for GS/JAC subsolver if (inp_unit /= psb_inp_unit) then close(inp_unit) end if end if call psb_bcast(ctxt,mtrx) call psb_bcast(ctxt,rhs) call psb_bcast(ctxt,guess) call psb_bcast(ctxt,sol) call psb_bcast(ctxt,filefmt) call psb_bcast(ctxt,afmt) call psb_bcast(ctxt,part) call psb_bcast(ctxt,solve%kmethd) call psb_bcast(ctxt,solve%istopc) call psb_bcast(ctxt,solve%itmax) call psb_bcast(ctxt,solve%itrace) call psb_bcast(ctxt,solve%irst) call psb_bcast(ctxt,solve%eps) call psb_bcast(ctxt,prec%descr) call psb_bcast(ctxt,prec%ptype) ! broadcast first (pre-)smoother / 1-lev prec data call psb_bcast(ctxt,prec%smther) call psb_bcast(ctxt,prec%jsweeps) call psb_bcast(ctxt,prec%novr) call psb_bcast(ctxt,prec%restr) call psb_bcast(ctxt,prec%prol) call psb_bcast(ctxt,prec%solve) call psb_bcast(ctxt,prec%fill) call psb_bcast(ctxt,prec%thr) ! broadcast second (post-)smoother call psb_bcast(ctxt,prec%smther2) call psb_bcast(ctxt,prec%jsweeps2) call psb_bcast(ctxt,prec%novr2) call psb_bcast(ctxt,prec%restr2) call psb_bcast(ctxt,prec%prol2) call psb_bcast(ctxt,prec%solve2) call psb_bcast(ctxt,prec%fill2) call psb_bcast(ctxt,prec%thr2) ! broadcast AMG parameters call psb_bcast(ctxt,prec%mlcycle) call psb_bcast(ctxt,prec%outer_sweeps) call psb_bcast(ctxt,prec%maxlevs) call psb_bcast(ctxt,prec%aggr_prol) call psb_bcast(ctxt,prec%par_aggr_alg) call psb_bcast(ctxt,prec%aggr_ord) call psb_bcast(ctxt,prec%aggr_filter) call psb_bcast(ctxt,prec%mncrratio) call psb_bcast(ctxt,prec%thrvsz) if (prec%thrvsz > 0) then if (iam /= psb_root_) call psb_realloc(prec%thrvsz,prec%athresv,info) call psb_bcast(ctxt,prec%athresv) end if call psb_bcast(ctxt,prec%athres) call psb_bcast(ctxt,prec%csize) call psb_bcast(ctxt,prec%cmat) call psb_bcast(ctxt,prec%csolve) call psb_bcast(ctxt,prec%csbsolve) call psb_bcast(ctxt,prec%cfill) call psb_bcast(ctxt,prec%cthres) call psb_bcast(ctxt,prec%cjswp) end subroutine get_parms end program amg_sf_sample