!!$ !!$ !!$ MLD2P4 version 1.0 !!$ MultiLevel Domain Decomposition Parallel Preconditioners Package !!$ based on PSBLAS (Parallel Sparse BLAS version 2.2) !!$ !!$ (C) Copyright 2008 !!$ !!$ Salvatore Filippone University of Rome Tor Vergata !!$ Alfredo Buttari University of Rome Tor Vergata !!$ Pasqua D'Ambra ICAR-CNR, Naples !!$ Daniela di Serafino Second University of Naples !!$ !!$ 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. 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File: mld_saggrmat_raw_asb.F90 ! ! Subroutine: mld_saggrmat_raw_asb ! Version: real ! ! This routine builds a coarse-level matrix A_C from a fine-level matrix A ! by using a Galerkin approach, i.e. ! ! A_C = P_C^T A P_C, ! ! where P_C is the piecewise constant interpolation operator corresponding ! the fine-to-coarse level mapping built by mld_aggrmap_bld. ! ! The coarse-level matrix A_C is distributed among the parallel processes or ! replicated on each of them, according to the value of p%iprcparm(mld_coarse_mat_), ! specified by the user through mld_sprecinit and mld_sprecset. ! ! For details see ! P. D'Ambra, D. di Serafino and S. Filippone, On the development of ! PSBLAS-based parallel two-level Schwarz preconditioners, Appl. Num. Math., ! 57 (2007), 1181-1196. ! ! ! Arguments: ! a - type(psb_sspmat_type), input. ! The sparse matrix structure containing the local part of ! the fine-level matrix. ! desc_a - type(psb_desc_type), input. ! The communication descriptor of the fine-level matrix. ! ac - type(psb_sspmat_type), output. ! The sparse matrix structure containing the local part of ! the coarse-level matrix. ! desc_ac - type(psb_desc_type), output. ! The communication descriptor of the coarse-level matrix. ! p - type(mld_sbaseprc_type), input/output. ! The base preconditioner data structure containing the local ! part of the base preconditioner to be built. ! info - integer, output. ! Error code. ! subroutine mld_saggrmat_raw_asb(a,desc_a,ac,desc_ac,p,info) use psb_base_mod use mld_inner_mod, mld_protect_name => mld_saggrmat_raw_asb #ifdef MPI_MOD use mpi #endif implicit none #ifdef MPI_H include 'mpif.h' #endif ! Arguments type(psb_sspmat_type), intent(in) :: a type(psb_desc_type), intent(in) :: desc_a type(psb_sspmat_type), intent(out) :: ac type(psb_desc_type), intent(out) :: desc_ac type(mld_sbaseprc_type), intent(inout), target :: p integer, intent(out) :: info ! Local variables integer ::ictxt,np,me, err_act, icomm character(len=20) :: name type(psb_sspmat_type) :: b integer, pointer :: nzbr(:), idisp(:) type(psb_sspmat_type), pointer :: am1,am2 integer :: nrow, nglob, ncol, ntaggr, nzac, ip, ndx,& & naggr, nzt, naggrm1, i name='mld_aggrmat_raw_asb' if(psb_get_errstatus().ne.0) return info=0 call psb_erractionsave(err_act) call psb_nullify_sp(b) ictxt = psb_cd_get_context(desc_a) icomm = psb_cd_get_mpic(desc_a) call psb_info(ictxt, me, np) nglob = psb_cd_get_global_rows(desc_a) nrow = psb_cd_get_local_rows(desc_a) ncol = psb_cd_get_local_cols(desc_a) am2 => p%av(mld_sm_pr_t_) am1 => p%av(mld_sm_pr_) call psb_nullify_sp(am1) call psb_nullify_sp(am2) naggr = p%nlaggr(me+1) ntaggr = sum(p%nlaggr) allocate(nzbr(np), idisp(np),stat=info) if (info /= 0) then info=4025 call psb_errpush(info,name,i_err=(/2*np,0,0,0,0/),& & a_err='integer') goto 9999 end if naggrm1=sum(p%nlaggr(1:me)) if (p%iprcparm(mld_coarse_mat_) == mld_repl_mat_) then do i=1, nrow p%mlia(i) = p%mlia(i) + naggrm1 end do call psb_halo(p%mlia,desc_a,info) end if if(info /= 0) then call psb_errpush(4010,name,a_err='psb_halo') goto 9999 end if if (p%iprcparm(mld_coarse_mat_) == mld_repl_mat_) then call psb_sp_all(ncol,ntaggr,am1,ncol,info) else call psb_sp_all(ncol,naggr,am1,ncol,info) end if if (info /= 0) then call psb_errpush(4010,name,a_err='spall') goto 9999 end if do i=1,nrow am1%aspk(i) = sone am1%ia1(i) = i am1%ia2(i) = p%mlia(i) end do am1%infoa(psb_nnz_) = nrow call psb_spcnv(am1,info,afmt='csr',dupl=psb_dupl_add_) call psb_transp(am1,am2) call psb_sp_clip(a,b,info,jmax=nrow) if(info /= 0) then call psb_errpush(4010,name,a_err='spclip') goto 9999 end if ! Out from sp_clip is always in COO, but just in case.. if (psb_tolower(b%fida) /= 'coo') then call psb_errpush(4010,name,a_err='spclip NOT COO') goto 9999 end if nzt = psb_sp_get_nnzeros(b) do i=1, nzt b%ia1(i) = p%mlia(b%ia1(i)) b%ia2(i) = p%mlia(b%ia2(i)) enddo b%m = naggr b%k = naggr ! This is to minimize data exchange call psb_spcnv(b,info,afmt='coo',dupl=psb_dupl_add_) if (p%iprcparm(mld_coarse_mat_) == mld_repl_mat_) then call psb_cdall(ictxt,desc_ac,info,mg=ntaggr,repl=.true.) if(info /= 0) then call psb_errpush(4010,name,a_err='psb_cdall') goto 9999 end if nzbr(:) = 0 nzbr(me+1) = nzt call psb_sum(ictxt,nzbr(1:np)) nzac = sum(nzbr) call psb_sp_all(ntaggr,ntaggr,ac,nzac,info) if(info /= 0) then call psb_errpush(4010,name,a_err='sp_all') goto 9999 end if do ip=1,np idisp(ip) = sum(nzbr(1:ip-1)) enddo ndx = nzbr(me+1) call mpi_allgatherv(b%aspk,ndx,mpi_real,ac%aspk,nzbr,idisp,& & mpi_real,icomm,info) call mpi_allgatherv(b%ia1,ndx,mpi_integer,ac%ia1,nzbr,idisp,& & mpi_integer,icomm,info) call mpi_allgatherv(b%ia2,ndx,mpi_integer,ac%ia2,nzbr,idisp,& & mpi_integer,icomm,info) if(info /= 0) then info=-1 call psb_errpush(info,name) goto 9999 end if ac%m = ntaggr ac%k = ntaggr ac%infoa(psb_nnz_) = nzac ac%fida='COO' ac%descra='GUN' call psb_spcnv(ac,info,afmt='coo',dupl=psb_dupl_add_) if(info /= 0) then call psb_errpush(4010,name,a_err='sp_free') goto 9999 end if else if (p%iprcparm(mld_coarse_mat_) == mld_distr_mat_) then call psb_cdall(ictxt,desc_ac,info,nl=naggr) if (info == 0) call psb_cdasb(desc_ac,info) if (info == 0) call psb_sp_clone(b,ac,info) if(info /= 0) then call psb_errpush(4001,name,a_err='Build ac, desc_ac') goto 9999 end if call psb_sp_free(b,info) if(info /= 0) then call psb_errpush(4010,name,a_err='sp_free') goto 9999 end if else info = 4001 call psb_errpush(4001,name,a_err='invalid mld_coarse_mat_') goto 9999 end if deallocate(nzbr,idisp) call psb_spcnv(ac,info,afmt='csr',dupl=psb_dupl_add_) if(info /= 0) then call psb_errpush(4010,name,a_err='ipcoo2csr') goto 9999 end if call psb_erractionrestore(err_act) return 9999 continue call psb_erractionrestore(err_act) if (err_act.eq.psb_act_abort_) then call psb_error() return end if return end subroutine mld_saggrmat_raw_asb