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199 lines
7.8 KiB
Fortran
199 lines
7.8 KiB
Fortran
!
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!
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! AMG4PSBLAS version 1.0
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! Algebraic Multigrid Package
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! based on PSBLAS (Parallel Sparse BLAS version 3.7)
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!
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! (C) Copyright 2021
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!
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! Salvatore Filippone
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! Pasqua D'Ambra
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! Fabio Durastante
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions
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! are met:
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! 1. Redistributions of source code must retain the above copyright
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! notice, this list of conditions and the following disclaimer.
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! 2. Redistributions in binary form must reproduce the above copyright
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! notice, this list of conditions, and the following disclaimer in the
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! documentation and/or other materials provided with the distribution.
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! 3. The name of the AMG4PSBLAS group or the names of its contributors may
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! not be used to endorse or promote products derived from this
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! software without specific written permission.
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!
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! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
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! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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! POSSIBILITY OF SUCH DAMAGE.
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!
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!
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! File: amg_daggrmat_nosmth_bld.F90
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!
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! Subroutine: amg_daggrmat_nosmth_bld
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! Version: real
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!
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! This routine builds a coarse-level matrix A_C from a fine-level matrix A
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! by using the Galerkin approach, i.e.
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!
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! A_C = P_C^T A P_C,
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!
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! where P_C is the piecewise constant interpolation operator corresponding
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! the fine-to-coarse level mapping built by amg_aggrmap_bld.
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!
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! The coarse-level matrix A_C is distributed among the parallel processes or
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! replicated on each of them, according to the value of p%parms%coarse_mat
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! specified by the user through amg_dprecinit and amg_zprecset.
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! On output from this routine the entries of AC, op_prol, op_restr
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! are still in "global numbering" mode; this is fixed in the calling routine
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! aggregator%mat_bld.
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!
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! For details see
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! P. D'Ambra, D. di Serafino and S. Filippone, On the development of
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! PSBLAS-based parallel two-level Schwarz preconditioners, Appl. Num. Math.,
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! 57 (2007), 1181-1196.
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!
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!
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! Arguments:
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! a - type(psb_dspmat_type), input.
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! The sparse matrix structure containing the local part of
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! the fine-level matrix.
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! desc_a - type(psb_desc_type), input.
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! The communication descriptor of the fine-level matrix.
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! p - type(amg_d_onelev_type), input/output.
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! The 'one-level' data structure that will contain the local
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! part of the matrix to be built as well as the information
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! concerning the prolongator and its transpose.
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! parms - type(amg_dml_parms), input
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! Parameters controlling the choice of algorithm
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! ac - type(psb_dspmat_type), output
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! The coarse matrix on output
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!
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! ilaggr - integer, dimension(:), input
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! The mapping between the row indices of the coarse-level
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! matrix and the row indices of the fine-level matrix.
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! ilaggr(i)=j means that node i in the adjacency graph
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! of the fine-level matrix is mapped onto node j in the
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! adjacency graph of the coarse-level matrix. Note that the indices
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! are assumed to be shifted so as to make sure the ranges on
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! the various processes do not overlap.
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! nlaggr - integer, dimension(:) input
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! nlaggr(i) contains the aggregates held by process i.
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! op_prol - type(psb_dspmat_type), input/output
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! The tentative prolongator on input, the computed prolongator on output
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!
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! op_restr - type(psb_dspmat_type), output
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! The restrictor operator; normally, it is the transpose of the prolongator.
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!
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! info - integer, output.
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! Error code.
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!
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!
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subroutine amg_daggrmat_nosmth_bld(a,desc_a,ilaggr,nlaggr,parms,&
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& ac,desc_ac,op_prol,op_restr,t_prol,info)
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use psb_base_mod
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use amg_base_prec_type
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use amg_d_inner_mod, amg_protect_name => amg_daggrmat_nosmth_bld
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use amg_d_base_aggregator_mod
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implicit none
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! Arguments
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type(psb_dspmat_type), intent(in) :: a
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type(psb_desc_type), intent(inout) :: desc_a
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integer(psb_lpk_), intent(inout) :: ilaggr(:), nlaggr(:)
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type(amg_dml_parms), intent(inout) :: parms
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type(psb_dspmat_type), intent(inout) :: op_prol,ac,op_restr
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type(psb_ldspmat_type), intent(inout) :: t_prol
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type(psb_desc_type), intent(inout) :: desc_ac
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integer(psb_ipk_), intent(out) :: info
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! Local variables
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integer(psb_ipk_) :: err_act
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type(psb_ctxt_type) :: ctxt
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integer(psb_ipk_) :: np, me
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character(len=20) :: name
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type(psb_ld_coo_sparse_mat) :: lcoo_prol
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type(psb_d_coo_sparse_mat) :: coo_prol, coo_restr
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type(psb_d_csr_sparse_mat) :: acsr
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integer(psb_ipk_) :: debug_level, debug_unit
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integer(psb_lpk_) :: nrow, nglob, ncol, ntaggr, nzl, ip, &
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& naggr, nzt, naggrm1, naggrp1, i, k
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integer(psb_ipk_) :: inaggr, nzlp
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logical, parameter :: debug = .false.
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name = 'amg_aggrmat_nosmth_bld'
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info = psb_success_
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call psb_erractionsave(err_act)
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if (psb_errstatus_fatal()) then
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info = psb_err_internal_error_; goto 9999
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end if
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ctxt = desc_a%get_context()
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call psb_info(ctxt, me, np)
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nglob = desc_a%get_global_rows()
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nrow = desc_a%get_local_rows()
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ncol = desc_a%get_local_cols()
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naggr = nlaggr(me+1)
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ntaggr = sum(nlaggr)
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naggrm1 = sum(nlaggr(1:me))
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naggrp1 = sum(nlaggr(1:me+1))
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call a%cp_to(acsr)
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call t_prol%mv_to(lcoo_prol)
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inaggr = naggr
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call psb_cdall(ctxt,desc_ac,info,nl=inaggr)
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nzlp = lcoo_prol%get_nzeros()
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call desc_ac%indxmap%g2lip_ins(lcoo_prol%ja(1:nzlp),info)
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call lcoo_prol%set_ncols(desc_ac%get_local_cols())
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call lcoo_prol%cp_to_icoo(coo_prol,info)
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if (debug) call check_coo(me,trim(name)//' Check 1 on coo_prol:',coo_prol)
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call psb_cdasb(desc_ac,info)
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call psb_cd_reinit(desc_ac,info)
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call amg_ptap_bld(acsr,desc_a,nlaggr,parms,ac,&
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& coo_prol,desc_ac,coo_restr,info)
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call coo_restr%set_nrows(desc_ac%get_local_rows())
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call coo_restr%set_ncols(desc_a%get_local_cols())
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call coo_prol%set_nrows(desc_a%get_local_rows())
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call coo_prol%set_ncols(desc_ac%get_local_cols())
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if (debug) call check_coo(me,trim(name)//' Check 1 on coo_restr:',coo_restr)
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call op_prol%mv_from(coo_prol)
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call op_restr%mv_from(coo_restr)
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call psb_erractionrestore(err_act)
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return
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9999 call psb_error_handler(err_act)
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return
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contains
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subroutine check_coo(me,string,coo)
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implicit none
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integer(psb_ipk_) :: me
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type(psb_d_coo_sparse_mat) :: coo
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character(len=*) :: string
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integer(psb_lpk_) :: nr,nc,nz
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nr = coo%get_nrows()
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nc = coo%get_ncols()
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nz = coo%get_nzeros()
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write(0,*) me,string,nr,nc,&
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& minval(coo%ia(1:nz)),maxval(coo%ia(1:nz)),&
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& minval(coo%ja(1:nz)),maxval(coo%ja(1:nz))
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end subroutine check_coo
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end subroutine amg_daggrmat_nosmth_bld
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