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amg4psblas/mlprec/impl/level/mld_s_base_onelev_mat_asb.f90

182 lines
7.5 KiB
Fortran

!
!
! MLD2P4 version 2.2
! MultiLevel Domain Decomposition Parallel Preconditioners Package
! based on PSBLAS (Parallel Sparse BLAS version 3.5)
!
! (C) Copyright 2008-2018
!
! Salvatore Filippone
! Pasqua D'Ambra
! Daniela di Serafino
!
! 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 MLD2P4 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 MLD2P4 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: mld_s_onelev_mat_asb.f90
!
! Subroutine: mld_s_onelev_mat_asb
! Version: real
!
! This routine builds the matrix associated to the current level of the
! multilevel preconditioner from the matrix associated to the previous level,
! by using the user-specified aggregation technique (therefore, it also builds the
! prolongation and restriction operators mapping the current level to the
! previous one and vice versa).
! The current level is regarded as the coarse one, while the previous as
! the fine one. This is in agreement with the fact that the routine is called,
! by mld_mlprec_bld, only on levels >=2.
! The main structure is:
! 1. Perform sanity checks;
! 2. Call mld_Xaggrmat_asb to compute prolongator/restrictor/AC
! 3. According to the choice of DIST/REPL for AC, build a descriptor DESC_AC,
! and adjust the column numbering of AC/OP_PROL/OP_RESTR
! 4. Pack restrictor and prolongator into p%map
! 5. Fix base_a and base_desc pointers.
!
!
! Arguments:
! p - type(mld_s_onelev_type), input/output.
! The 'one-level' data structure containing the control
! parameters and (eventually) coarse matrix and prolongator/restrictors.
!
! a - type(psb_sspmat_type).
! The sparse matrix structure containing the local part of the
! fine-level matrix.
! desc_a - type(psb_desc_type), input.
! The communication descriptor of a.
! 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_sspmat_type), input/output
! The tentative prolongator on input, released on output.
!
! info - integer, output.
! Error code.
!
subroutine mld_s_base_onelev_mat_asb(lv,a,desc_a,ilaggr,nlaggr,op_prol,info)
use psb_base_mod
use mld_base_prec_type
use mld_s_onelev_mod, mld_protect_name => mld_s_base_onelev_mat_asb
implicit none
! Arguments
class(mld_s_onelev_type), intent(inout), target :: lv
type(psb_sspmat_type), intent(in) :: a
type(psb_desc_type), intent(inout) :: desc_a
integer(psb_lpk_), intent(inout) :: nlaggr(:)
integer(psb_lpk_), intent(inout) :: ilaggr(:)
type(psb_lsspmat_type), intent(inout) :: op_prol
integer(psb_ipk_), intent(out) :: info
! Local variables
character(len=24) :: name
integer(psb_ipk_) :: ictxt, np, me
integer(psb_ipk_) :: err_act
type(psb_lsspmat_type) :: lac, op_restr
type(psb_sspmat_type) :: ac, iop_restr, iop_prol
type(psb_ls_coo_sparse_mat) :: acoo, bcoo
type(psb_ls_csr_sparse_mat) :: acsr1
integer(psb_ipk_) :: nzl, inl
integer(psb_ipk_) :: debug_level, debug_unit
name='mld_s_onelev_mat_asb'
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()
info = psb_success_
ictxt = desc_a%get_context()
call psb_info(ictxt,me,np)
call mld_check_def(lv%parms%aggr_prol,'Smoother',&
& mld_smooth_prol_,is_legal_ml_aggr_prol)
call mld_check_def(lv%parms%coarse_mat,'Coarse matrix',&
& mld_distr_mat_,is_legal_ml_coarse_mat)
call mld_check_def(lv%parms%aggr_filter,'Use filtered matrix',&
& mld_no_filter_mat_,is_legal_aggr_filter)
call mld_check_def(lv%parms%aggr_omega_alg,'Omega Alg.',&
& mld_eig_est_,is_legal_ml_aggr_omega_alg)
call mld_check_def(lv%parms%aggr_eig,'Eigenvalue estimate',&
& mld_max_norm_,is_legal_ml_aggr_eig)
call mld_check_def(lv%parms%aggr_omega_val,'Omega',szero,is_legal_s_omega)
!
! Build the coarse-level matrix from the fine-level one, starting from
! the mapping defined by mld_aggrmap_bld and applying the aggregation
! algorithm specified by lv%iprcparm(mld_aggr_prol_)
!
call lv%aggr%mat_bld(lv%parms,a,desc_a,ilaggr,nlaggr,lac,op_prol,op_restr,info)
if(info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='mld_aggrmat_asb')
goto 9999
end if
!
! Now build its descriptor and convert global indices for
! ac, op_restr and op_prol
!
if (info == psb_success_) &
& call lv%aggr%mat_asb(lv%parms,a,desc_a,ilaggr,nlaggr,&
& lac,lv%desc_ac,op_prol,op_restr,info)
call lv%ac%mv_from_l(lac)
if (info == psb_success_) call lv%ac%cscnv(info,type='csr',dupl=psb_dupl_add_)
if (info == psb_success_) call lv%aggr%bld_map(desc_a, lv%desc_ac,&
& ilaggr,nlaggr,op_restr,op_prol,lv%map,info)
if(info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='mat_asb/map_bld')
goto 9999
end if
!
! Fix the base_a and base_desc pointers for handling of residuals.
! This is correct because this routine is only called at levels >=2.
!
lv%base_a => lv%ac
lv%base_desc => lv%desc_ac
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(err_act)
return
end subroutine mld_s_base_onelev_mat_asb