! ! ! 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. ! ! ! File: amg_caggrmat_nosmth_bld.F90 ! ! Subroutine: amg_caggrmat_nosmth_bld ! Version: complex ! ! This routine builds a coarse-level matrix A_C from a fine-level matrix A ! by using the 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 amg_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%parms%coarse_mat ! specified by the user through amg_cprecinit and amg_zprecset. ! On output from this routine the entries of AC, op_prol, op_restr ! are still in "global numbering" mode; this is fixed in the calling routine ! aggregator%mat_bld. ! ! 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_cspmat_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. ! p - type(amg_c_onelev_type), input/output. ! The 'one-level' data structure that will contain the local ! part of the matrix to be built as well as the information ! concerning the prolongator and its transpose. ! parms - type(amg_sml_parms), input ! Parameters controlling the choice of algorithm ! ac - type(psb_cspmat_type), output ! The coarse matrix on output ! ! ilaggr - integer, dimension(:), input ! The mapping between the row indices of the coarse-level ! matrix and the row indices of the fine-level matrix. ! ilaggr(i)=j means that node i in the adjacency graph ! of the fine-level matrix is mapped onto node j in the ! adjacency graph of the coarse-level matrix. Note that the indices ! are assumed to be shifted so as to make sure the ranges on ! the various processes do not overlap. ! nlaggr - integer, dimension(:) input ! nlaggr(i) contains the aggregates held by process i. ! op_prol - type(psb_cspmat_type), input/output ! The tentative prolongator on input, the computed prolongator on output ! ! op_restr - type(psb_cspmat_type), output ! The restrictor operator; normally, it is the transpose of the prolongator. ! ! info - integer, output. ! Error code. ! ! subroutine amg_caggrmat_nosmth_bld(a,desc_a,ilaggr,nlaggr,parms,& & ac,desc_ac,op_prol,op_restr,t_prol,info) use psb_base_mod use amg_base_prec_type use amg_c_inner_mod, amg_protect_name => amg_caggrmat_nosmth_bld use amg_c_base_aggregator_mod implicit none ! Arguments type(psb_cspmat_type), intent(in) :: a type(psb_desc_type), intent(inout) :: desc_a integer(psb_lpk_), intent(inout) :: ilaggr(:), nlaggr(:) type(amg_sml_parms), intent(inout) :: parms type(psb_cspmat_type), intent(inout) :: op_prol,ac,op_restr type(psb_lcspmat_type), intent(inout) :: t_prol type(psb_desc_type), intent(inout) :: desc_ac integer(psb_ipk_), intent(out) :: info ! Local variables integer(psb_ipk_) :: err_act type(psb_ctxt_type) :: ctxt integer(psb_ipk_) :: np, me character(len=20) :: name type(psb_lc_coo_sparse_mat) :: lcoo_prol type(psb_c_coo_sparse_mat) :: coo_prol, coo_restr type(psb_c_csr_sparse_mat) :: acsr integer(psb_ipk_) :: debug_level, debug_unit integer(psb_lpk_) :: nrow, nglob, ncol, ntaggr, nzl, ip, & & naggr, nzt, naggrm1, naggrp1, i, k integer(psb_ipk_) :: inaggr, nzlp logical, parameter :: debug = .false. name = 'amg_aggrmat_nosmth_bld' info = psb_success_ call psb_erractionsave(err_act) if (psb_errstatus_fatal()) then info = psb_err_internal_error_; goto 9999 end if ctxt = desc_a%get_context() call psb_info(ctxt, me, np) nglob = desc_a%get_global_rows() nrow = desc_a%get_local_rows() ncol = desc_a%get_local_cols() naggr = nlaggr(me+1) ntaggr = sum(nlaggr) naggrm1 = sum(nlaggr(1:me)) naggrp1 = sum(nlaggr(1:me+1)) call a%cp_to(acsr) call t_prol%mv_to(lcoo_prol) inaggr = naggr call psb_cdall(ctxt,desc_ac,info,nl=inaggr) nzlp = lcoo_prol%get_nzeros() call desc_ac%indxmap%g2lip_ins(lcoo_prol%ja(1:nzlp),info) call lcoo_prol%set_ncols(desc_ac%get_local_cols()) call lcoo_prol%cp_to_icoo(coo_prol,info) if (debug) call check_coo(me,trim(name)//' Check 1 on coo_prol:',coo_prol) call psb_cdasb(desc_ac,info) call psb_cd_reinit(desc_ac,info) call amg_ptap_bld(acsr,desc_a,nlaggr,parms,ac,& & coo_prol,desc_ac,coo_restr,info) call coo_restr%set_nrows(desc_ac%get_local_rows()) call coo_restr%set_ncols(desc_a%get_local_cols()) call coo_prol%set_nrows(desc_a%get_local_rows()) call coo_prol%set_ncols(desc_ac%get_local_cols()) if (debug) call check_coo(me,trim(name)//' Check 1 on coo_restr:',coo_restr) call op_prol%mv_from(coo_prol) call op_restr%mv_from(coo_restr) call psb_erractionrestore(err_act) return 9999 call psb_error_handler(err_act) return contains subroutine check_coo(me,string,coo) implicit none integer(psb_ipk_) :: me type(psb_c_coo_sparse_mat) :: coo character(len=*) :: string integer(psb_lpk_) :: nr,nc,nz nr = coo%get_nrows() nc = coo%get_ncols() nz = coo%get_nzeros() write(0,*) me,string,nr,nc,& & minval(coo%ia(1:nz)),maxval(coo%ia(1:nz)),& & minval(coo%ja(1:nz)),maxval(coo%ja(1:nz)) end subroutine check_coo end subroutine amg_caggrmat_nosmth_bld