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150 lines
5.3 KiB
Fortran
150 lines
5.3 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_sslud_bld.f90
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!
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! Subroutine: mld_ssludist_bld
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! Version: real
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!
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! This routine computes the LU factorization of of a distributed matrix,
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! by using SuperLU_DIST.
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!
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! The matrix to be factorized is the coarsest-level matrix of a multilevel
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! preconditioner and is distributed among the processes. Its factorization
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! is used to build the 'base preconditioner' corresponding to the coarsest
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! level.
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!
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! The data structure allocated by SuperLU_DIST to store the L and U factors
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! is pointed by p%iprcparm(mld_slud_ptr_).
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!
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!
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! Arguments:
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! a - type(psb_sspmat_type), input/output.
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! The sparse matrix structure containing the local part of the
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! matrix to be factorized.
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! desc_a - type(psb_desc_type), input.
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! The communication descriptor associated to a.
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! p - type(mld_sbaseprec_type), input/output.
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! The 'base preconditioner' data structure containing the pointer,
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! p%iprcparm(mld_slud_ptr_), to the data structure used by
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! SuperLU_DIST to store the L and U factors.
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! info - integer, output.
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! Error code.
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!
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subroutine mld_ssludist_bld(a,desc_a,p,info)
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use psb_sparse_mod
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use mld_inner_mod, mld_protect_name => mld_ssludist_bld
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implicit none
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! Arguments
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type(psb_sspmat_type), intent(inout) :: a
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type(psb_desc_type), intent(in) :: desc_a
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type(mld_sbaseprec_type), intent(inout) :: p
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integer, intent(out) :: info
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! Local variables
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integer :: nzt,ictxt,me,np,err_act,&
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& mglob,ifrst,ibcheck,nrow,ncol,npr,npc
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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=psb_success_
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name='mld_sslud_bld'
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call psb_erractionsave(err_act)
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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 (psb_toupper(a%fida) /= 'CSR') then
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info=psb_err_unsupported_format_
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call psb_errpush(info,name,a_err=a%fida)
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goto 9999
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endif
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!
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! WARN: we need to check for a BLOCK distribution (this is the
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! distribution required by SuperLU_DIST)
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!
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nrow = psb_cd_get_local_rows(desc_a)
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ncol = psb_cd_get_local_cols(desc_a)
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call psb_loc_to_glob(1,ifrst,desc_a,info)
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call psb_loc_to_glob(nrow,ibcheck,desc_a,info)
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ibcheck = ibcheck - ifrst + 1
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ibcheck = ibcheck - nrow
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call psb_amx(ictxt,ibcheck)
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if (ibcheck > 0) then
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write(0,*) 'Warning: does not look like a BLOCK distribution'
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endif
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mglob = psb_cd_get_global_rows(desc_a)
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nzt = psb_sp_get_nnzeros(a)
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npr = np
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npc = 1
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call psb_loc_to_glob(a%ia1(1:nzt),desc_a,info,iact='I')
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!
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! Compute the LU factorization
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!
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call mld_ssludist_fact(mglob,nrow,nzt,ifrst,&
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& a%aspk,a%ia2,a%ia1,p%iprcparm(mld_slud_ptr_),&
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& npr, npc, info)
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if (info /= psb_success_) then
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ch_err='psb_sludist_fact'
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call psb_errpush(4110,name,a_err=ch_err,i_err=(/info,0,0,0,0/))
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goto 9999
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end if
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call psb_glob_to_loc(a%ia1(1:nzt),desc_a,info,iact='I')
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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_ssludist_bld
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