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amg4psblas/amgprec/impl/amg_sprecbld.f90

161 lines
5.2 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.
!
!
! File: amg_sprecbld.f90
!
! Subroutine: amg_sprecbld
! Version: real
! Contains: subroutine init_baseprec_av
!
! This routine builds the preconditioner according to the requirements made by
! the user through the subroutines amg_precinit and amg_precset.
!
!
! Arguments:
! a - type(psb_sspmat_type).
! The sparse matrix structure containing the local part of the
! matrix to be preconditioned.
! desc_a - type(psb_desc_type), input.
! The communication descriptor of a.
! p - type(amg_sprec_type), input/output.
! The preconditioner data structure containing the local part
! of the preconditioner to be built.
! info - integer, output.
! Error code.
!
subroutine amg_sprecbld(a,desc_a,prec,info,amold,vmold,imold)
use psb_base_mod
use amg_s_prec_mod, amg_protect_name => amg_sprecbld
Implicit None
! Arguments
type(psb_sspmat_type),intent(in), target :: a
type(psb_desc_type), intent(inout), target :: desc_a
class(amg_sprec_type),intent(inout), target :: prec
integer(psb_ipk_), intent(out) :: info
class(psb_s_base_sparse_mat), intent(in), optional :: amold
class(psb_s_base_vect_type), intent(in), optional :: vmold
class(psb_i_base_vect_type), intent(in), optional :: imold
! Local Variables
type(amg_sprec_type) :: t_prec
type(psb_ctxt_type) :: ctxt
integer(psb_ipk_) :: me, np
integer(psb_ipk_) :: err,i,k,err_act, iszv, newsz
integer(psb_ipk_) :: ipv(amg_ifpsz_), val
type(amg_dml_parms) :: prm
integer(psb_ipk_) :: debug_level, debug_unit
character(len=20) :: name, ch_err
info=psb_success_
err=0
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()
name = 'amg_sprecbld'
info = psb_success_
ctxt = desc_a%get_context()
call psb_info(ctxt, me, np)
prec%ctxt = ctxt
if (debug_level >= psb_debug_outer_) &
& write(debug_unit,*) me,' ',trim(name),&
& 'Entering '
!
if (.not.allocated(prec%precv)) then
!! Error: should have called amg_sprecinit
info=3111
call psb_errpush(info,name)
goto 9999
end if
!
! Check to ensure all procs have the same
!
newsz = -1
iszv = size(prec%precv)
call psb_bcast(ctxt,iszv)
if (iszv /= size(prec%precv)) then
info=psb_err_internal_error_
call psb_errpush(info,name,a_err='Inconsistent size of precv')
goto 9999
end if
if (iszv <= 0) then
! Is this really possible? probably not.
info=psb_err_from_subroutine_
ch_err='size bpv'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
!
! Build the preconditioner
!
call prec%hierarchy_build(a,desc_a,info)
if (info /= psb_success_) then
info=psb_err_internal_error_
call psb_errpush(info,name,a_err='Error from hierarchy build')
goto 9999
end if
call prec%smoothers_build(a,desc_a,info,amold,vmold,imold)
if (info /= psb_success_) then
info=psb_err_internal_error_
call psb_errpush(info,name,a_err='Error from smoothers build')
goto 9999
end if
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(err_act)
return
end subroutine amg_sprecbld