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amg4psblas/mlprec/impl/mld_c_smoothers_bld.f90

200 lines
7.0 KiB
Fortran

!!$
!!$
!!$ MLD2P4 version 2.1
!!$ MultiLevel Domain Decomposition Parallel Preconditioners Package
!!$ based on PSBLAS (Parallel Sparse BLAS version 3.4)
!!$
!!$ (C) Copyright 2008, 2010, 2012, 2015, 2017
!!$
!!$ Salvatore Filippone Cranfield University
!!$ Ambra Abdullahi Hassan University of Rome Tor Vergata
!!$ Alfredo Buttari CNRS-IRIT, Toulouse
!!$ Pasqua D'Ambra ICAR-CNR, Naples
!!$ Daniela di Serafino Second University of Naples
!!$
!!$ 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_c_smoothers_bld.f90
!
! Subroutine: mld_c_smoothers_bld
! Version: complex
!
! This routine performs the final phase of the multilevel preconditioner build process:
! builds the "smoother" objects at each level, based on the matrix hierarchy prepared
! by mld_c_hierarchy_bld.
!
! A multilevel preconditioner is regarded as an array of 'one-level' data structures,
! each containing the part of the preconditioner associated to a certain level,
! (for more details see the description of mld_Tonelev_type in mld_prec_type.f90).
! The levels are numbered in increasing order starting from the finest one, i.e.
! level 1 is the finest level. No transfer operators are associated to level 1.
! Each level provides a "build" method; for the base type, the "one-level"
! build procedure simply invokes the build method of the first smoother object,
! and also on the second object if allocated.
!
!
! Arguments:
! a - type(psb_cspmat_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(mld_cprec_type), input/output.
! The preconditioner data structure containing the local part
! of the preconditioner to be built.
! info - integer, output.
! Error code.
!
! amold - class(psb_c_base_sparse_mat), input, optional
! Mold for the inner format of matrices contained in the
! preconditioner
!
!
! vmold - class(psb_c_base_vect_type), input, optional
! Mold for the inner format of vectors contained in the
! preconditioner
!
!
!
subroutine mld_c_smoothers_bld(a,desc_a,p,info,amold,vmold,imold)
use psb_base_mod
use mld_c_inner_mod
use mld_c_prec_mod, mld_protect_name => mld_c_smoothers_bld
Implicit None
! Arguments
type(psb_cspmat_type),intent(in), target :: a
type(psb_desc_type), intent(inout), target :: desc_a
type(mld_cprec_type),intent(inout),target :: p
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
!!$ character, intent(in), optional :: upd
! Local Variables
integer(psb_ipk_) :: ictxt, me,np
integer(psb_ipk_) :: err,i,k, err_act, iszv, newsz, casize, nplevs, mxplevs
real(psb_spk_) :: mnaggratio
integer(psb_ipk_) :: ipv(mld_ifpsz_), val
integer(psb_ipk_) :: int_err(5)
character :: upd_
integer(psb_ipk_) :: debug_level, debug_unit
character(len=20) :: name, ch_err
if (psb_get_errstatus().ne.0) return
info=psb_success_
err=0
call psb_erractionsave(err_act)
debug_unit = psb_get_debug_unit()
debug_level = psb_get_debug_level()
name = 'mld_c_smoothers_bld'
info = psb_success_
int_err(1) = 0
ictxt = desc_a%get_context()
call psb_info(ictxt, me, np)
if (debug_level >= psb_debug_outer_) &
& write(debug_unit,*) me,' ',trim(name),&
& 'Entering '
!
! For the time being we are commenting out the UPDATE argument
! we plan to resurrect it later.
! !$ if (present(upd)) then
! !$ if (debug_level >= psb_debug_outer_) &
! !$ & write(debug_unit,*) me,' ',trim(name),'UPD ', upd
! !$
! !$ if ((psb_toupper(upd).eq.'F').or.(psb_toupper(upd).eq.'T')) then
! !$ upd_=psb_toupper(upd)
! !$ else
! !$ upd_='F'
! !$ endif
! !$ else
! !$ upd_='F'
! !$ endif
upd_ = 'F'
if (.not.allocated(p%precv)) then
!! Error: should have called mld_cprecinit
info=3111
call psb_errpush(info,name)
goto 9999
end if
!
! Check to ensure all procs have the same
!
iszv = size(p%precv)
call psb_bcast(ictxt,iszv)
if (iszv /= size(p%precv)) then
info=psb_err_internal_error_
call psb_errpush(info,name,a_err='Inconsistent size of precv')
goto 9999
end if
if (iszv < 1) then
! We should never get here.
info=psb_err_from_subroutine_
ch_err='size bpv'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
endif
!
! Now do the real build.
!
do i=1, iszv
!
! build the base preconditioner at level i
!
call p%precv(i)%bld(info,amold=amold,vmold=vmold,imold=imold)
if (info /= psb_success_) then
write(ch_err,'(a,i7)') 'Error @ level',i
call psb_errpush(psb_err_internal_error_,name,&
& a_err=ch_err)
goto 9999
endif
end do
if (debug_level >= psb_debug_outer_) &
& write(debug_unit,*) me,' ',trim(name),&
& 'Exiting with',iszv,' levels'
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(err_act)
return
end subroutine mld_c_smoothers_bld