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216 lines
7.4 KiB
Fortran
216 lines
7.4 KiB
Fortran
!!$
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!!$
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!!$ MLD2P4 version 2.0
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!!$ MultiLevel Domain Decomposition Parallel Preconditioners Package
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!!$ based on PSBLAS (Parallel Sparse BLAS version 3.0)
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!!$
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!!$ (C) Copyright 2008,2009,2010
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!!$
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!!$ Salvatore Filippone University of Rome Tor Vergata
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!!$ Alfredo Buttari CNRS-IRIT, Toulouse
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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_dbaseprec_bld.f90
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!
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! Subroutine: mld_dbaseprec_bld
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! Version: real
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!
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! This routine builds a 'base preconditioner' related to a matrix A.
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! In a multilevel framework, it is called by mld_mlprec_bld to build the
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! base preconditioner at each level.
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!
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! Details on the base preconditioner to be built are stored in the iprcparm
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! field of the base preconditioner data structure (for a description of this
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! data structure see mld_prec_type.f90).
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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 A 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_dbaseprec_type), input/output.
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! The 'base preconditioner' data structure containing the local
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! part of the preconditioner at the selected level.
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! info - integer, output.
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! Error code.
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! upd - character, input, optional.
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! If upd='F' then the base preconditioner is built from
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! scratch; if upd=T' then the matrix to be preconditioned
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! has the same sparsity pattern of a matrix that has been
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! previously preconditioned, hence some information is reused
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! in building the new preconditioner.
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!
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subroutine mld_dbaseprec_bld(a,desc_a,p,info,upd)
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use psb_sparse_mod
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use mld_inner_mod, mld_protect_name => mld_dbaseprec_bld
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Implicit None
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! Arguments
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type(psb_dspmat_type), target :: a
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type(psb_desc_type), intent(in), target :: desc_a
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type(mld_dbaseprec_type),intent(inout) :: 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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Integer :: err, n_row, n_col,ictxt, me,np,mglob, err_act
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character :: iupd
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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() /= 0) return
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name = 'mld_dbaseprec_bld'
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info=psb_success_
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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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ictxt = psb_cd_get_context(desc_a)
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n_row = psb_cd_get_local_rows(desc_a)
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n_col = psb_cd_get_local_cols(desc_a)
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mglob = psb_cd_get_global_rows(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),' start'
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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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if ((psb_toupper(UPD) == 'F').or.(psb_toupper(UPD) == 'T')) then
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IUPD=psb_toupper(UPD)
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else
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IUPD='F'
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endif
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else
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IUPD='F'
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endif
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!
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! Should add check to ensure all procs have the same...
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!
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call mld_check_def(p%iprcparm(mld_smoother_type_),'base_prec',&
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& mld_diag_,is_legal_base_prec)
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call psb_nullify_desc(p%desc_data)
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select case(p%iprcparm(mld_smoother_type_))
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case (mld_noprec_)
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! No preconditioner
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! Do nothing
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call psb_cdcpy(desc_a,p%desc_data,info)
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='psb_cdcpy'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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case (mld_diag_)
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! Diagonal preconditioner
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call mld_diag_bld(a,desc_a,p,info)
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if(debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),&
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& ': out of mld_diag_bld'
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='mld_diag_bld'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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case(mld_bjac_,mld_as_)
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! Additive Schwarz preconditioners/smoothers
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call mld_check_def(p%iprcparm(mld_sub_ovr_),'overlap',&
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& 0,is_legal_n_ovr)
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call mld_check_def(p%iprcparm(mld_sub_restr_),'restriction',&
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& psb_halo_,is_legal_restrict)
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call mld_check_def(p%iprcparm(mld_sub_prol_),'prolongator',&
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& psb_none_,is_legal_prolong)
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call mld_check_def(p%iprcparm(mld_sub_ren_),'renumbering',&
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& mld_renum_none_,is_legal_renum)
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call mld_check_def(p%iprcparm(mld_sub_solve_),'fact',&
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& mld_ilu_n_,is_legal_ml_fact)
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! Set parameters for using SuperLU_dist on the local submatrices
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if (p%iprcparm(mld_sub_solve_) == mld_sludist_) then
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p%iprcparm(mld_sub_ovr_) = 0
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p%iprcparm(mld_smoother_sweeps_) = 1
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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 mld_as_bld'
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! Build the local part of the base preconditioner/smoother
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call mld_as_bld(a,desc_a,p,iupd,info)
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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call psb_errpush(info,name,a_err='mld_as_bld')
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goto 9999
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end if
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case default
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info=psb_err_internal_error_
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ch_err='Unknown mld_smoother_type_'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end select
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p%iprcparm(mld_prec_status_) = mld_prec_built_
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if (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),': Done'
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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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end subroutine mld_dbaseprec_bld
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