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amg4psblas/amgprec/impl/smoother/amg_c_l1_jac_smoother_bld.f90

178 lines
5.8 KiB
Fortran

!
!
! AMG4PSBLAS version 1.0
! Algebraic Multigrid Package
! based on PSBLAS (Parallel Sparse BLAS version 3.5)
!
! (C) Copyright 2020
!
! 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 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.
!
!
subroutine amg_c_l1_jac_smoother_bld(a,desc_a,sm,info,amold,vmold,imold)
use psb_base_mod
use amg_c_diag_solver
use amg_c_jac_smoother, amg_protect_name => amg_c_l1_jac_smoother_bld
Implicit None
! Arguments
type(psb_cspmat_type), intent(in), target :: a
Type(psb_desc_type), Intent(inout) :: desc_a
class(amg_c_l1_jac_smoother_type), intent(inout) :: sm
integer(psb_ipk_), intent(out) :: info
class(psb_c_base_sparse_mat), intent(in), optional :: amold
class(psb_c_base_vect_type), intent(in), optional :: vmold
class(psb_i_base_vect_type), intent(in), optional :: imold
! Local variables
integer(psb_ipk_) :: n_row,n_col, nrow_a, nztota, nzeros
real(psb_spk_), allocatable :: arwsum(:)
type(psb_cspmat_type) :: tmpa
type(psb_ctxt_type) :: ctxt
integer(psb_ipk_) :: np, me, i, err_act, debug_unit, debug_level
character(len=20) :: name='c_l1_jac_smoother_bld', ch_err
info=psb_success_
call psb_erractionsave(err_act)
debug_unit = psb_get_debug_unit()
debug_level = psb_get_debug_level()
ctxt = desc_a%get_context()
call psb_info(ctxt, me, np)
if (debug_level >= psb_debug_outer_) &
& write(debug_unit,*) me,' ',trim(name),' start'
n_row = desc_a%get_local_rows()
n_col = desc_a%get_local_cols()
nrow_a = a%get_nrows()
nztota = a%get_nzeros()
if( sm%checkres ) sm%pa => a
select type (smsv => sm%sv)
class is (amg_c_diag_solver_type)
call sm%nd%free()
sm%pa => a
sm%nd_nnz_tot = nztota
call psb_sum(ctxt,sm%nd_nnz_tot)
call sm%sv%build(a,desc_a,info,amold=amold,vmold=vmold)
class default
if (smsv%is_global()) then
! Do not put anything into SM%ND since the solver
! is acting globally.
call sm%nd%free()
sm%nd_nnz_tot = 0
call psb_sum(ctxt,sm%nd_nnz_tot)
call sm%sv%build(a,desc_a,info,amold=amold,vmold=vmold)
else
call a%csclip(tmpa,info,&
& jmax=nrow_a,rscale=.false.,cscale=.false.)
call a%csclip(sm%nd,info,&
& jmin=nrow_a+1,rscale=.false.,cscale=.false.)
arwsum = sm%nd%arwsum(info)
call combine_dl1(-sone,arwsum,sm%nd,info)
call combine_dl1(sone,arwsum,tmpa,info)
sm%nd_nnz_tot = sm%nd%get_nzeros()
call psb_sum(ctxt,sm%nd_nnz_tot)
call sm%sv%build(tmpa,desc_a,info,amold=amold,vmold=vmold)
if (info == psb_success_) then
if (present(amold)) then
call sm%nd%cscnv(info,&
& mold=amold,dupl=psb_dupl_add_)
else
call sm%nd%cscnv(info,&
& type='csr',dupl=psb_dupl_add_)
endif
end if
end if
end select
if (info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,&
& a_err='clip & psb_spcnv csr 4')
goto 9999
end if
if (info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,&
& a_err='solver build')
goto 9999
end if
if (debug_level >= psb_debug_outer_) &
& write(debug_unit,*) me,' ',trim(name),' end'
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(err_act)
return
contains
subroutine combine_dl1(alpha,dl1,mat,info)
implicit none
real(psb_spk_), intent(in) :: alpha, dl1(:)
type(psb_cspmat_type), intent(inout) :: mat
integer(psb_ipk_), intent(out) :: info
!
integer(psb_ipk_) :: k, nz, nrm, dp
type(psb_c_coo_sparse_mat) :: tcoo
call mat%mv_to(tcoo)
nz = tcoo%get_nzeros()
nrm = min(size(dl1),tcoo%get_nrows(),tcoo%get_ncols())
!!$ write(0,*) 'Check on combine_dl1: ',nrm, tcoo%get_nrows(),tcoo%get_ncols(), nz
call tcoo%ensure_size(nz+nrm)
call tcoo%set_dupl(psb_dupl_add_)
do k=1,nrm
if (dl1(k) /= szero) then
nz = nz + 1
tcoo%ia(nz) = k
tcoo%ja(nz) = k
tcoo%val(nz) = alpha*dl1(k)
end if
end do
call tcoo%set_nzeros(nz)
call tcoo%fix(info)
call mat%mv_from(tcoo)
end subroutine combine_dl1
end subroutine amg_c_l1_jac_smoother_bld