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387 lines
13 KiB
Fortran
387 lines
13 KiB
Fortran
!!$
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!!$
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!!$ MLD2P4 version 1.0
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!!$ MultiLevel Domain Decomposition Parallel Preconditioners Package
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!!$ based on PSBLAS (Parallel Sparse BLAS version 2.2)
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!!$
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!!$ (C) Copyright 2008
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!!$
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!!$ Salvatore Filippone University of Rome Tor Vergata
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!!$ Alfredo Buttari University of Rome Tor Vergata
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!!$ Pasqua D'Ambra ICAR-CNR, Naples
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!!$ Daniela di Serafino Second University of Naples
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!!$
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!!$ Redistribution and use in source and binary forms, with or without
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!!$ modification, are permitted provided that the following conditions
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!!$ are met:
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!!$ 1. Redistributions of source code must retain the above copyright
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!!$ notice, this list of conditions and the following disclaimer.
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!!$ 2. Redistributions in binary form must reproduce the above copyright
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!!$ notice, this list of conditions, and the following disclaimer in the
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!!$ documentation and/or other materials provided with the distribution.
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!!$ 3. The name of the MLD2P4 group or the names of its contributors may
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!!$ not be used to endorse or promote products derived from this
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!!$ software without specific written permission.
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!!$
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!!$ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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!!$ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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!!$ TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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!!$ PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE MLD2P4 GROUP OR ITS CONTRIBUTORS
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!!$ BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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!!$ CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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!!$ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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!!$ INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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!!$ CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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!!$ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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!!$ POSSIBILITY OF SUCH DAMAGE.
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!!$
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!!$
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! File: mld_smlprec_bld.f90
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!
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! Subroutine: mld_smlprec_bld
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! Version: real
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! Contains: subroutine init_baseprec_av
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!
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! This routine builds the preconditioner according to the requirements made by
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! the user trough the subroutines mld_precinit and mld_precset.
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!
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! A multilevel preconditioner is regarded as an array of 'base preconditioners',
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! each representing the part of the preconditioner associated to a certain level.
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! The levels are numbered in increasing order starting from the finest one, i.e.
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! level 1 is the finest level.
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!
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!
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! Arguments:
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! a - type(psb_dspmat_type).
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! The sparse matrix structure containing the local part of the
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! matrix to be preconditioned.
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! desc_a - type(psb_desc_type), input.
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! The communication descriptor of a.
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! p - type(mld_dprec_type), input/output.
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! The preconditioner data structure containing the local part
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! of the preconditioner to be built.
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! info - integer, output.
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! Error code.
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!
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subroutine mld_smlprec_bld(a,desc_a,p,info)
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use psb_base_mod
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use mld_inner_mod, mld_protect_name => mld_smlprec_bld
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use mld_prec_mod
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Implicit None
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! Arguments
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type(psb_sspmat_type), target :: a
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type(psb_desc_type), intent(in), target :: desc_a
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type(mld_sprec_type),intent(inout),target :: p
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integer, intent(out) :: info
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!!$ character, intent(in), optional :: upd
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! Local Variables
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type(mld_sprec_type) :: t_prec
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Integer :: err,i,k,ictxt, me,np, err_act, iszv, newsz
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integer :: ipv(mld_ifpsz_), val
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integer :: int_err(5)
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character :: upd_
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integer :: debug_level, debug_unit
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character(len=20) :: name, ch_err
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if (psb_get_errstatus().ne.0) return
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info=0
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err=0
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call psb_erractionsave(err_act)
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debug_unit = psb_get_debug_unit()
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debug_level = psb_get_debug_level()
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name = 'mld_smlprec_bld'
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info = 0
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int_err(1) = 0
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ictxt = psb_cd_get_context(desc_a)
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call psb_info(ictxt, me, np)
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if (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),&
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& 'Entering ',desc_a%matrix_data(:)
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!
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! For the time being we are commenting out the UPDATE argument
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! we plan to resurrect it later.
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!!$ if (present(upd)) then
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!!$ if (debug_level >= psb_debug_outer_) &
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!!$ & write(debug_unit,*) me,' ',trim(name),'UPD ', upd
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!!$
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!!$ if ((psb_toupper(upd).eq.'F').or.(psb_toupper(upd).eq.'T')) then
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!!$ upd_=psb_toupper(upd)
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!!$ else
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!!$ upd_='F'
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!!$ endif
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!!$ else
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!!$ upd_='F'
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!!$ endif
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upd_ = 'F'
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if (.not.allocated(p%precv)) then
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!! Error: should have called mld_dprecinit
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info=3111
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call psb_errpush(info,name)
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goto 9999
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end if
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!
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! Check to ensure all procs have the same
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!
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newsz = -1
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iszv = size(p%precv)
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call psb_bcast(ictxt,iszv)
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if (iszv /= size(p%precv)) then
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info=4001
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call psb_errpush(info,name,a_err='Inconsistent size of precv')
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goto 9999
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end if
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if (iszv <= 1) then
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! We should only ever get here for multilevel.
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info=4010
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ch_err='size bpv'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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endif
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if (iszv > 1) then
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!
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! Build the base preconditioners corresponding to the remaining
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! levels
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!
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!
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! Check on the iprcparm contents: they should be the same
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! on all processes.
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!
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if (me == psb_root_) ipv(:) = p%precv(1)%iprcparm(:)
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call psb_bcast(ictxt,ipv)
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if (any(ipv(:) /= p%precv(1)%iprcparm(:) )) then
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write(debug_unit,*) me,name,&
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&': Inconsistent arguments among processes, forcing a default'
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p%precv(1)%iprcparm(:) = ipv(:)
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end if
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!
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! Finest level first; remember to fix base_a and base_desc
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!
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call init_baseprec_av(p%precv(1)%prec,info)
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p%precv(1)%base_a => a
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p%precv(1)%base_desc => desc_a
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if (info /= 0) then
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call psb_errpush(4001,name,a_err='Base level precbuild.')
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goto 9999
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end if
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do i=2, iszv
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!
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! Check on the iprcparm contents: they should be the same
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! on all processes.
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!
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if (me == psb_root_) ipv(:) = p%precv(i)%iprcparm(:)
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call psb_bcast(ictxt,ipv)
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if (any(ipv(:) /= p%precv(i)%iprcparm(:) )) then
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write(debug_unit,*) me,name,&
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&': Inconsistent arguments among processes, resetting.'
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p%precv(i)%iprcparm(:) = ipv(:)
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end if
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!
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! Sanity checks on the parameters
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!
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if (i<iszv) then
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!
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! A replicated matrix only makes sense at the coarsest level
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!
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call mld_check_def(p%precv(i)%iprcparm(mld_coarse_mat_),'Coarse matrix',&
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& mld_distr_mat_,is_distr_ml_coarse_mat)
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else if (i == iszv) then
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call check_coarse_lev(p%precv(i))
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end if
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if (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),&
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& 'Calling mlprcbld at level ',i
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!
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! Build the mapping between levels (i-1) and (i)
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!
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call init_baseprec_av(p%precv(i)%prec,info)
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if (info == 0) call mld_coarse_bld(p%precv(i-1)%base_a,&
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& p%precv(i-1)%base_desc, p%precv(i),info)
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if (info /= 0) then
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call psb_errpush(4001,name,a_err='Init upper level preconditioner')
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goto 9999
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endif
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if (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),&
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& 'Return from ',i,' call to mlprcbld ',info
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if (i>2) then
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if (all(p%precv(i)%map%naggr == p%precv(i-1)%map%naggr)) then
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newsz=i-1
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end if
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call psb_bcast(ictxt,newsz)
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if (newsz > 0) exit
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end if
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end do
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if (newsz > 0) then
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if (me == 0) then
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write(debug_unit,*) trim(name),&
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&': Warning: aggregates from level ',&
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& newsz
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write(debug_unit,*) trim(name),&
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&': to level ',&
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& iszv,' coincide.'
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write(debug_unit,*) trim(name),&
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&': Number of levels actually used :',newsz
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write(debug_unit,*)
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end if
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allocate(t_prec%precv(newsz),stat=info)
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if (info /= 0) then
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call psb_errpush(4010,name,a_err='prec reallocation')
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goto 9999
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endif
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do i=1,newsz-1
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call mld_move_alloc(p%precv(i),t_prec%precv(i),info)
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end do
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call mld_move_alloc(p%precv(iszv),t_prec%precv(newsz),info)
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do i=newsz+1, iszv
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call mld_precfree(p%precv(i),info)
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end do
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call mld_move_alloc(t_prec,p,info)
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! Ignore errors from transfer
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info = 0
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!
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! Restart
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iszv = newsz
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! Fix the pointers, but the level 1 should
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! be already OK
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do i=2, iszv - 1
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p%precv(i)%base_a => p%precv(i)%ac
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p%precv(i)%base_desc => p%precv(i)%desc_ac
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p%precv(i)%map%p_desc_X => p%precv(i-1)%base_desc
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p%precv(i)%map%p_desc_Y => p%precv(i)%base_desc
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end do
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i = iszv
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call check_coarse_lev(p%precv(i))
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call init_baseprec_av(p%precv(i)%prec,info)
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if (info == 0) call mld_coarse_bld(p%precv(i-1)%base_a,&
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& p%precv(i-1)%base_desc, p%precv(i),info)
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if (info /= 0) then
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call psb_errpush(4010,name,a_err='coarse rebuild')
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goto 9999
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endif
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end if
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end if
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do i=1, iszv
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if (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),&
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& 'Calling mlprcbld at level ',i
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select case(p%precv(i)%prec%iprcparm(mld_sub_solve_))
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case(mld_ilu_n_,mld_milu_n_)
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call mld_check_def(p%precv(i)%prec%iprcparm(mld_sub_fillin_),&
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& 'Level',0,is_legal_ml_lev)
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case(mld_ilu_t_)
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call mld_check_def(p%precv(i)%prec%rprcparm(mld_sub_iluthrs_),&
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& 'Eps',szero,is_legal_s_fact_thrs)
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end select
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call mld_check_def(p%precv(i)%prec%iprcparm(mld_smoother_sweeps_),&
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& 'Jacobi sweeps',1,is_legal_jac_sweeps)
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call mld_baseprec_bld(p%precv(i)%base_a,p%precv(i)%base_desc,&
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& p%precv(i)%prec,info)
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if (info /= 0) then
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call psb_errpush(4001,name,a_err='One level preconditioner build.')
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goto 9999
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endif
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if (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),&
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& 'Return from ',i,' call to mlprcbld ',info
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end do
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act.eq.psb_act_abort_) then
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call psb_error()
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return
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end if
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return
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contains
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subroutine init_baseprec_av(p,info)
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type(mld_sbaseprec_type), intent(inout) :: p
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integer :: info
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if (allocated(p%av)) then
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if (size(p%av) /= mld_max_avsz_) then
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deallocate(p%av,stat=info)
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if (info /= 0) return
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endif
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end if
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if (.not.(allocated(p%av))) then
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allocate(p%av(mld_max_avsz_),stat=info)
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if (info /= 0) return
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end if
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do k=1,size(p%av)
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call psb_nullify_sp(p%av(k))
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end do
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end subroutine init_baseprec_av
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subroutine check_coarse_lev(prec)
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type(mld_sonelev_type) :: prec
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!
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! At the coarsest level, check mld_coarse_solve_
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!
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val = prec%iprcparm(mld_coarse_solve_)
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select case (val)
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case(mld_umf_, mld_slu_)
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if ((prec%iprcparm(mld_coarse_mat_) /= mld_repl_mat_).or.&
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& (prec%prec%iprcparm(mld_sub_solve_) /= val)) then
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if (me == 0) write(debug_unit,*)&
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& 'Warning: inconsistent coarse level specification.'
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if (me == 0) write(debug_unit,*)&
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& ' Resetting according to the value specified for mld_coarse_solve_.'
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prec%iprcparm(mld_coarse_mat_) = mld_repl_mat_
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prec%prec%iprcparm(mld_sub_solve_) = val
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prec%prec%iprcparm(mld_smoother_type_) = mld_bjac_
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end if
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case(mld_sludist_)
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if ((prec%iprcparm(mld_coarse_mat_) /= mld_distr_mat_).or.&
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& (prec%prec%iprcparm(mld_sub_solve_) /= val)) then
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if (me == 0) write(debug_unit,*)&
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& 'Warning: inconsistent coarse level specification.'
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if (me == 0) write(debug_unit,*)&
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& ' Resetting according to the value specified for mld_coarse_solve_.'
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prec%iprcparm(mld_coarse_mat_) = mld_distr_mat_
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prec%prec%iprcparm(mld_sub_solve_) = val
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prec%prec%iprcparm(mld_smoother_type_) = mld_bjac_
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prec%prec%iprcparm(mld_smoother_sweeps_) = 1
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end if
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end select
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end subroutine check_coarse_lev
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end subroutine mld_smlprec_bld
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