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183 lines
7.5 KiB
Fortran
183 lines
7.5 KiB
Fortran
!
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!
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! MLD2P4 version 2.2
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! MultiLevel Domain Decomposition Parallel Preconditioners Package
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! based on PSBLAS (Parallel Sparse BLAS version 3.5)
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!
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! (C) Copyright 2008-2018
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!
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! Salvatore Filippone
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! Pasqua D'Ambra
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! Daniela di Serafino
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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 MLD2P4 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 MLD2P4 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: mld_d_onelev_mat_asb.f90
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!
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! Subroutine: mld_d_onelev_mat_asb
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! Version: real
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!
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! This routine builds the matrix associated to the current level of the
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! multilevel preconditioner from the matrix associated to the previous level,
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! by using the user-specified aggregation technique (therefore, it also builds the
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! prolongation and restriction operators mapping the current level to the
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! previous one and vice versa).
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! The current level is regarded as the coarse one, while the previous as
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! the fine one. This is in agreement with the fact that the routine is called,
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! by mld_mlprec_bld, only on levels >=2.
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! The main structure is:
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! 1. Perform sanity checks;
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! 2. Call mld_Xaggrmat_asb to compute prolongator/restrictor/AC
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! 3. According to the choice of DIST/REPL for AC, build a descriptor DESC_AC,
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! and adjust the column numbering of AC/OP_PROL/OP_RESTR
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! 4. Pack restrictor and prolongator into p%map
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! 5. Fix base_a and base_desc pointers.
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!
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!
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! Arguments:
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! p - type(mld_d_onelev_type), input/output.
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! The 'one-level' data structure containing the control
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! parameters and (eventually) coarse matrix and prolongator/restrictors.
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!
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! a - type(psb_dspmat_type).
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! The sparse matrix structure containing the local part of the
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! fine-level matrix.
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! desc_a - type(psb_desc_type), input.
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! The communication descriptor of a.
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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, released on output.
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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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subroutine mld_d_base_onelev_mat_asb(lv,a,desc_a,ilaggr,nlaggr,op_prol,info)
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use psb_base_mod
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use mld_base_prec_type
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use mld_d_onelev_mod, mld_protect_name => mld_d_base_onelev_mat_asb
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implicit none
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! Arguments
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class(mld_d_onelev_type), intent(inout), target :: lv
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type(psb_dspmat_type), intent(in) :: a
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type(psb_desc_type), intent(in) :: desc_a
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integer(psb_lpk_), intent(inout) :: nlaggr(:)
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integer(psb_lpk_), intent(inout) :: ilaggr(:)
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type(psb_ldspmat_type), intent(inout) :: op_prol
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integer(psb_ipk_), intent(out) :: info
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! Local variables
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character(len=24) :: name
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integer(psb_ipk_) :: ictxt, np, me
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integer(psb_ipk_) :: err_act
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type(psb_ldspmat_type) :: lac, lac1, op_restr
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type(psb_dspmat_type) :: ac, iop_restr, iop_prol
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type(psb_ld_coo_sparse_mat) :: acoo, bcoo
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type(psb_ld_csr_sparse_mat) :: acsr1
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integer(psb_lpk_) :: ntaggr, nr, nc
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integer(psb_ipk_) :: nzl, inl
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integer(psb_ipk_) :: debug_level, debug_unit
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name='mld_d_onelev_mat_asb'
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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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debug_unit = psb_get_debug_unit()
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debug_level = psb_get_debug_level()
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info = psb_success_
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ictxt = desc_a%get_context()
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call psb_info(ictxt,me,np)
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call mld_check_def(lv%parms%aggr_prol,'Smoother',&
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& mld_smooth_prol_,is_legal_ml_aggr_prol)
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call mld_check_def(lv%parms%coarse_mat,'Coarse matrix',&
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& mld_distr_mat_,is_legal_ml_coarse_mat)
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call mld_check_def(lv%parms%aggr_filter,'Use filtered matrix',&
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& mld_no_filter_mat_,is_legal_aggr_filter)
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call mld_check_def(lv%parms%aggr_omega_alg,'Omega Alg.',&
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& mld_eig_est_,is_legal_ml_aggr_omega_alg)
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call mld_check_def(lv%parms%aggr_eig,'Eigenvalue estimate',&
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& mld_max_norm_,is_legal_ml_aggr_eig)
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call mld_check_def(lv%parms%aggr_omega_val,'Omega',dzero,is_legal_d_omega)
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!
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! Build the coarse-level matrix from the fine-level one, starting from
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! the mapping defined by mld_aggrmap_bld and applying the aggregation
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! algorithm specified by lv%iprcparm(mld_aggr_prol_)
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!
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call lv%aggr%mat_bld(lv%parms,a,desc_a,ilaggr,nlaggr,lac,op_prol,op_restr,info)
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if(info /= psb_success_) then
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call psb_errpush(psb_err_from_subroutine_,name,a_err='mld_aggrmat_asb')
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goto 9999
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end if
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!
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! Now build its descriptor and convert global indices for
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! ac, op_restr and op_prol
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!
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if (info == psb_success_) &
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& call lv%aggr%mat_asb(lv%parms,a,desc_a,ilaggr,nlaggr,&
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& lac,lv%desc_ac,op_prol,op_restr,info)
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call lv%ac%mv_from_l(lac)
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if (info == psb_success_) call lv%ac%cscnv(info,type='csr',dupl=psb_dupl_add_)
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if (info == psb_success_) call lv%aggr%bld_map(desc_a, lv%desc_ac,&
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& ilaggr,nlaggr,op_restr,op_prol,lv%map,info)
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if(info /= psb_success_) then
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call psb_errpush(psb_err_from_subroutine_,name,a_err='mat_asb/map_bld')
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goto 9999
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end if
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!
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! Fix the base_a and base_desc pointers for handling of residuals.
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! This is correct because this routine is only called at levels >=2.
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!
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lv%base_a => lv%ac
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lv%base_desc => lv%desc_ac
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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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end subroutine mld_d_base_onelev_mat_asb
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