You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
amg4psblas/mlprec/impl/level/mld_d_base_onelev_mat_asb.f90

268 lines
10 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_d_onelev_mat_asb.f90
!
! Subroutine: mld_d_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_d_onelev_type), input/output.
! The 'one-level' data structure containing the control
! parameters and (eventually) coarse matrix and prolongator/restrictors.
!
! a - type(psb_dspmat_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_dspmat_type), input/output
! The tentative prolongator on input, released on output.
!
! info - integer, output.
! Error code.
!
subroutine mld_d_base_onelev_mat_asb(lv,a,desc_a,ilaggr,nlaggr,op_prol,info)
use psb_base_mod
use mld_base_prec_type
use mld_d_onelev_mod, mld_protect_name => mld_d_base_onelev_mat_asb
implicit none
! Arguments
class(mld_d_onelev_type), intent(inout), target :: lv
type(psb_dspmat_type), intent(in) :: a
type(psb_desc_type), intent(in) :: desc_a
integer(psb_ipk_), intent(inout) :: ilaggr(:),nlaggr(:)
type(psb_dspmat_type), intent(inout) :: op_prol
integer(psb_ipk_), intent(out) :: info
! Local variables
character(len=24) :: name
integer(psb_mpik_) :: ictxt, np, me
integer(psb_ipk_) :: err_act
type(psb_dspmat_type) :: ac, op_restr
type(psb_d_coo_sparse_mat) :: acoo, bcoo
type(psb_d_csr_sparse_mat) :: acsr1
integer(psb_ipk_) :: nzl, ntaggr
integer(psb_ipk_) :: debug_level, debug_unit
name='mld_d_onelev_mat_asb'
if (psb_get_errstatus().ne.0) return
call psb_erractionsave(err_act)
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',dzero,is_legal_d_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_asb(lv%parms,a,desc_a,ilaggr,nlaggr,ac,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
! Common code refactored here.
ntaggr = sum(nlaggr)
select case(lv%parms%coarse_mat)
case(mld_distr_mat_)
call ac%mv_to(bcoo)
nzl = bcoo%get_nzeros()
if (info == psb_success_) call psb_cdall(ictxt,lv%desc_ac,info,nl=nlaggr(me+1))
if (info == psb_success_) call psb_cdins(nzl,bcoo%ia,bcoo%ja,lv%desc_ac,info)
if (info == psb_success_) call psb_cdasb(lv%desc_ac,info)
if (info == psb_success_) call psb_glob_to_loc(bcoo%ia(1:nzl),lv%desc_ac,info,iact='I')
if (info == psb_success_) call psb_glob_to_loc(bcoo%ja(1:nzl),lv%desc_ac,info,iact='I')
if (info /= psb_success_) then
call psb_errpush(psb_err_internal_error_,name,&
& a_err='Creating lv%desc_ac and converting ac')
goto 9999
end if
if (debug_level >= psb_debug_outer_) &
& write(debug_unit,*) me,' ',trim(name),&
& 'Assembld aux descr. distr.'
call lv%ac%mv_from(bcoo)
call lv%ac%set_nrows(lv%desc_ac%get_local_rows())
call lv%ac%set_ncols(lv%desc_ac%get_local_cols())
call lv%ac%set_asb()
if (info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_sp_free')
goto 9999
end if
if (np>1) then
call op_prol%mv_to(acsr1)
nzl = acsr1%get_nzeros()
call psb_glob_to_loc(acsr1%ja(1:nzl),lv%desc_ac,info,'I')
if(info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_glob_to_loc')
goto 9999
end if
call op_prol%mv_from(acsr1)
endif
call op_prol%set_ncols(lv%desc_ac%get_local_cols())
if (np>1) then
call op_restr%cscnv(info,type='coo',dupl=psb_dupl_add_)
call op_restr%mv_to(acoo)
nzl = acoo%get_nzeros()
if (info == psb_success_) call psb_glob_to_loc(acoo%ia(1:nzl),lv%desc_ac,info,'I')
call acoo%set_dupl(psb_dupl_add_)
if (info == psb_success_) call op_restr%mv_from(acoo)
if (info == psb_success_) call op_restr%cscnv(info,type='csr')
if(info /= psb_success_) then
call psb_errpush(psb_err_internal_error_,name,&
& a_err='Converting op_restr to local')
goto 9999
end if
end if
!
! Clip to local rows.
!
call op_restr%set_nrows(lv%desc_ac%get_local_rows())
if (debug_level >= psb_debug_outer_) &
& write(debug_unit,*) me,' ',trim(name),&
& 'Done ac '
case(mld_repl_mat_)
!
!
call psb_cdall(ictxt,lv%desc_ac,info,mg=ntaggr,repl=.true.)
if (info == psb_success_) call psb_cdasb(lv%desc_ac,info)
if (info == psb_success_) &
& call psb_gather(lv%ac,ac,lv%desc_ac,info,dupl=psb_dupl_add_,keeploc=.false.)
if (info /= psb_success_) goto 9999
case default
info = psb_err_internal_error_
call psb_errpush(info,name,a_err='invalid mld_coarse_mat_')
goto 9999
end select
call lv%ac%cscnv(info,type='csr',dupl=psb_dupl_add_)
if(info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='spcnv')
goto 9999
end if
!
! Copy the prolongation/restriction matrices into the descriptor map.
! op_restr => PR^T i.e. restriction operator
! op_prol => PR i.e. prolongation operator
!
lv%map = psb_linmap(psb_map_aggr_,desc_a,&
& lv%desc_ac,op_restr,op_prol,ilaggr,nlaggr)
if (info == psb_success_) call op_prol%free()
if (info == psb_success_) call op_restr%free()
if(info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='sp_Free')
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_d_base_onelev_mat_asb