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amg4psblas/mlprec/impl/mld_sslud_bld.f90

160 lines
5.5 KiB
Fortran

!!$
!!$
!!$ MLD2P4 version 2.0
!!$ MultiLevel Domain Decomposition Parallel Preconditioners Package
!!$ based on PSBLAS (Parallel Sparse BLAS version 3.0)
!!$
!!$ (C) Copyright 2008,2009,2010
!!$
!!$ Salvatore Filippone 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_sslud_bld.f90
!
! Subroutine: mld_ssludist_bld
! Version: real
!
! This routine computes the LU factorization of of a distributed matrix,
! by using SuperLU_DIST.
!
! The matrix to be factorized is the coarsest-level matrix of a multilevel
! preconditioner and is distributed among the processes. Its factorization
! is used to build the 'base preconditioner' corresponding to the coarsest
! level.
!
! The data structure allocated by SuperLU_DIST to store the L and U factors
! is pointed by p%iprcparm(mld_slud_ptr_).
!
!
! Arguments:
! a - type(psb_sspmat_type), input/output.
! The sparse matrix structure containing the local part of the
! matrix to be factorized.
! desc_a - type(psb_desc_type), input.
! The communication descriptor associated to a.
! p - type(mld_sbaseprec_type), input/output.
! The 'base preconditioner' data structure containing the pointer,
! p%iprcparm(mld_slud_ptr_), to the data structure used by
! SuperLU_DIST to store the L and U factors.
! info - integer, output.
! Error code.
!
subroutine mld_ssludist_bld(a,desc_a,p,info)
use psb_base_mod
use mld_s_inner_mod, mld_protect_name => mld_ssludist_bld
implicit none
! Arguments
type(psb_sspmat_type), intent(inout) :: a
type(psb_desc_type), intent(in) :: desc_a
type(mld_sbaseprec_type), intent(inout) :: p
integer, intent(out) :: info
! Local variables
integer :: nzt,ictxt,me,np,err_act,&
& mglob,ifrst,ibcheck,nrow,ncol,npr,npc
character(len=20) :: name, ch_err
if (psb_get_errstatus().ne.0) return
info=psb_success_
name='mld_sslud_bld'
call psb_erractionsave(err_act)
ictxt = desc_a%get_context()
call psb_info(ictxt, me, np)
select type(aa=>a%a)
type is (psb_s_csr_sparse_mat)
!
! WARN: we need to check for a BLOCK distribution (this is the
! distribution required by SuperLU_DIST)
!
nrow = desc_a%get_local_rows()
ncol = desc_a%get_local_cols()
call psb_loc_to_glob(1,ifrst,desc_a,info)
call psb_loc_to_glob(nrow,ibcheck,desc_a,info)
ibcheck = ibcheck - ifrst + 1
ibcheck = ibcheck - nrow
call psb_amx(ictxt,ibcheck)
if (ibcheck > 0) then
write(0,*) 'Warning: does not look like a BLOCK distribution'
info=psb_err_unsupported_format_
ch_err = aa%get_fmt()
call psb_errpush(info,name,a_err=ch_err)
goto 9999
endif
mglob = desc_a%get_global_rows()
nzt = aa%get_nzeros()
npr = np
npc = 1
call psb_loc_to_glob(aa%ja(1:nzt),desc_a,info,iact='I')
!
! Compute the LU factorization
!
call mld_ssludist_fact(mglob,nrow,nzt,ifrst,&
& aa%val,aa%irp,aa%ja,p%iprcparm(mld_slud_ptr_),&
& npr, npc, info)
if (info /= psb_success_) then
ch_err='psb_sludist_fact'
call psb_errpush(4110,name,a_err=ch_err,i_err=(/info,0,0,0,0/))
goto 9999
end if
call psb_glob_to_loc(aa%ja(1:nzt),desc_a,info,iact='I')
class default
info=psb_err_unsupported_format_
ch_err = aa%get_fmt()
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end select
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
end subroutine mld_ssludist_bld