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amg4psblas/amgprec/impl/smoother/amg_d_as_smoother_bld.f90

185 lines
6.6 KiB
Fortran

!
!
! AMG4PSBLAS version 1.0
! Algebraic Multigrid Package
! based on PSBLAS (Parallel Sparse BLAS version 3.7)
!
! (C) Copyright 2021
!
! Salvatore Filippone
! Pasqua D'Ambra
! Fabio Durastante
!
! 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_d_as_smoother_bld(a,desc_a,sm,info,amold,vmold,imold)
use psb_base_mod
use amg_d_as_smoother, amg_protect_nam => amg_d_as_smoother_bld
Implicit None
! Arguments
type(psb_dspmat_type), intent(in), target :: a
Type(psb_desc_type), Intent(inout) :: desc_a
class(amg_d_as_smoother_type), intent(inout) :: sm
integer(psb_ipk_), intent(out) :: info
class(psb_d_base_sparse_mat), intent(in), optional :: amold
class(psb_d_base_vect_type), intent(in), optional :: vmold
class(psb_i_base_vect_type), intent(in), optional :: imold
! Local variables
type(psb_dspmat_type) :: blck, atmp
integer(psb_ipk_) :: n_row,n_col, nrow_a, nhalo, novr, data_
real(psb_dpk_), pointer :: ww(:), aux(:), tx(:),ty(:)
type(psb_ctxt_type) :: ctxt
integer(psb_ipk_) :: np, me,i, err_act, debug_unit, debug_level
character(len=20) :: name='d_as_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'
novr = sm%novr
if (novr < 0) then
info=psb_err_invalid_ovr_num_
call psb_errpush(info,name,&
& i_err=(/novr,izero,izero,izero,izero,izero/))
goto 9999
endif
if ((novr == 0).or.(np == 1)) then
call psb_cdcpy(desc_a,sm%desc_data,info)
If(debug_level >= psb_debug_outer_) &
& write(debug_unit,*) me,' ',trim(name),&
& ' done cdcpy'
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='psb_cdcpy'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
if (debug_level >= psb_debug_outer_) &
& write(debug_unit,*) me,' ',trim(name),&
& 'Early return: P>=3 N_OVR=0'
call blck%csall(izero,izero,info,ione)
else
!
! Build the auxiliary descriptor desc_p%matrix_data(psb_n_row_).
! This is done by psb_cdbldext (interface to psb_cdovr), which is
! independent of CSR, and has been placed in the tools directory
! of PSBLAS, instead of the mlprec directory of AMG4PSBLAS, because it
! might be used independently of the AS preconditioner, to build
! a descriptor for an extended stencil in a PDE solver.
!
call psb_cdbldext(a,desc_a,novr,sm%desc_data,info,extype=psb_ovt_asov_)
if(debug_level >= psb_debug_outer_) &
& write(debug_unit,*) me,' ',trim(name),&
& ' From cdbldext _:',sm%desc_data%get_local_rows(),&
& sm%desc_data%get_local_cols()
if (info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='psb_cdbldext'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
if (debug_level >= psb_debug_outer_) &
& write(debug_unit,*) me,' ',trim(name),&
& 'Before sphalo '
!
! Retrieve the remote sparse matrix rows required for the AS extended
! matrix
data_ = psb_comm_ext_
Call psb_sphalo(a,sm%desc_data,blck,info,data=data_,rowscale=.true.)
if (info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='psb_sphalo'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
if (debug_level >=psb_debug_outer_) &
& write(debug_unit,*) me,' ',trim(name),&
& 'After psb_sphalo ',&
& blck%get_nrows(), blck%get_nzeros()
End if
if (info == psb_success_) &
& call sm%sv%build(a,sm%desc_data,info,&
& blck,amold=amold,vmold=vmold)
nrow_a = a%get_nrows()
n_row = sm%desc_data%get_local_rows()
n_col = sm%desc_data%get_local_cols()
if (info == psb_success_) call a%csclip(sm%nd,info,&
& jmin=nrow_a+1,rscale=.false.,cscale=.false.)
if (info == psb_success_) call blck%csclip(atmp,info,&
& jmin=nrow_a+1,rscale=.false.,cscale=.false.)
if (info == psb_success_) call psb_rwextd(n_row,sm%nd,info,b=atmp)
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_)
end if
end if
if (info == psb_success_) then
if (present(imold)) then
call sm%desc_data%cnv(imold)
end if
end if
if (info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='clip & psb_spcnv csr 4')
goto 9999
end if
sm%nd_nnz_tot = sm%nd%get_nzeros()
call psb_sum(ctxt,sm%nd_nnz_tot)
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
end subroutine amg_d_as_smoother_bld