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amg4psblas/mlprec/mld_zprecbld.f90

243 lines
7.6 KiB
Fortran

!!$
!!$
!!$ MLD2P4 version 1.1
!!$ MultiLevel Domain Decomposition Parallel Preconditioners Package
!!$ based on PSBLAS (Parallel Sparse BLAS version 2.3.1)
!!$
!!$ (C) Copyright 2008,2009
!!$
!!$ Salvatore Filippone University of Rome Tor Vergata
!!$ Alfredo Buttari University of Rome Tor Vergata
!!$ 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_zprecbld.f90
!
! Subroutine: mld_zprecbld
! Version: complex
! Contains: subroutine init_baseprec_av
!
! This routine builds the preconditioner according to the requirements made by
! the user through the subroutines mld_precinit and mld_precset.
!
!
! Arguments:
! a - type(psb_zspmat_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_zprec_type), input/output.
! The preconditioner data structure containing the local part
! of the preconditioner to be built.
! info - integer, output.
! Error code.
!
subroutine mld_zprecbld(a,desc_a,p,info)
use psb_sparse_mod
use mld_inner_mod
use mld_prec_mod, mld_protect_name => mld_zprecbld
Implicit None
! Arguments
type(psb_zspmat_type),intent(in), target :: a
type(psb_desc_type), intent(in), target :: desc_a
type(mld_zprec_type),intent(inout), target :: p
integer, intent(out) :: info
!!$ character, intent(in), optional :: upd
! Local Variables
type(mld_zprec_type) :: t_prec
Integer :: err,i,k,ictxt, me,np, err_act, iszv, newsz
integer :: ipv(mld_ifpsz_), val
integer :: int_err(5)
character :: upd_
integer :: 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_zprecbld'
info = psb_success_
int_err(1) = 0
ictxt = psb_cd_get_context(desc_a)
call psb_info(ictxt, me, np)
if (debug_level >= psb_debug_outer_) &
& write(debug_unit,*) me,' ',trim(name),&
& 'Entering ',desc_a%matrix_data(:)
!
! 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_zprecinit
info=3111
call psb_errpush(info,name)
goto 9999
end if
!
! Check to ensure all procs have the same
!
newsz = -1
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 <= 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
!
! Number of levels = 1
!
if (iszv == 1) then
!
! Check on the iprcparm contents: they should be the same
! on all processes.
!
if (me == psb_root_) ipv(:) = p%precv(1)%iprcparm(:)
call psb_bcast(ictxt,ipv)
if (any(ipv(:) /= p%precv(1)%iprcparm(:) )) then
write(debug_unit,*) me,name,&
&': Inconsistent arguments among processes, forcing a default'
p%precv(1)%iprcparm(:) = ipv(:)
end if
!
! Remember to fix base_a and base_desc
!
call init_baseprec_av(p%precv(1)%prec,info)
p%precv(1)%base_a => a
p%precv(1)%base_desc => desc_a
if (info /= psb_success_) then
call psb_errpush(psb_err_internal_error_,name,a_err='Base level precbuild.')
goto 9999
end if
!
! Build the base preconditioner
!
select case(p%precv(1)%prec%iprcparm(mld_sub_solve_))
case(mld_ilu_n_,mld_milu_n_)
call mld_check_def(p%precv(1)%prec%iprcparm(mld_sub_fillin_),&
& 'Level',0,is_legal_ml_lev)
case(mld_ilu_t_)
call mld_check_def(p%precv(1)%prec%rprcparm(mld_sub_iluthrs_),&
& 'Eps',dzero,is_legal_fact_thrs)
end select
call mld_check_def(p%precv(1)%prec%iprcparm(mld_smoother_sweeps_),&
& 'Jacobi sweeps',1,is_legal_jac_sweeps)
call mld_baseprec_bld(p%precv(1)%base_a,p%precv(1)%base_desc,&
& p%precv(1)%prec,info)
if (info /= psb_success_) then
call psb_errpush(psb_err_internal_error_,name,a_err='One level preconditioner build.')
goto 9999
endif
!
! Number of levels > 1
!
else if (iszv > 1) then
!
! Build the multilevel preconditioner
!
call mld_mlprec_bld(a,desc_a,p,info)
if (info /= psb_success_) then
call psb_errpush(psb_err_internal_error_,name,a_err='Multilevel preconditioner build.')
goto 9999
endif
end if
call psb_erractionrestore(err_act)
return
9999 continue
call psb_erractionrestore(err_act)
if (err_act.eq.psb_act_abort_) then
call psb_error()
return
end if
return
contains
subroutine init_baseprec_av(p,info)
type(mld_zbaseprec_type), intent(inout) :: p
integer :: info
if (allocated(p%av)) then
if (size(p%av) /= mld_max_avsz_) then
deallocate(p%av,stat=info)
if (info /= psb_success_) return
endif
end if
if (.not.(allocated(p%av))) then
allocate(p%av(mld_max_avsz_),stat=info)
if (info /= psb_success_) return
end if
do k=1,size(p%av)
call psb_nullify_sp(p%av(k))
end do
end subroutine init_baseprec_av
end subroutine mld_zprecbld