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amg4psblas/mlprec/mld_dumf_bld.f90

139 lines
5.2 KiB
Fortran

!!$
!!$
!!$ MLD2P4 version 1.0
!!$ MultiLevel Domain Decomposition Parallel Preconditioners Package
!!$ based on PSBLAS (Parallel Sparse BLAS version 2.2)
!!$
!!$ (C) Copyright 2008
!!$
!!$ 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_dumf_bld.f90
!
! Subroutine: mld_dumf_bld
! Version: real
!
! This routine computes the LU factorization of the local part of the matrix
! stored into a, by using UMFPACK.
!
! The matrix to be factorized is
! - either a submatrix of the distributed matrix corresponding to any level
! of a multilevel preconditioner, and its factorization is used to build
! the 'base preconditioner' corresponding to that level,
! - or a copy of the whole matrix corresponding to the coarsest level of
! a multilevel preconditioner, and its factorization is used to build
! the 'base preconditioner' corresponding to the coarsest level.
!
! The data structures allocated by UMFPACK to compute the symbolic and the
! numeric factorization are pointed by p%iprcparm(mld_umf_symptr_) and
! p%iprcparm(mld_umf_numptr_).
!
!
! Arguments:
! a - type(psb_dspmat_type), input/output.
! The sparse matrix structure containing the local submatrix
! to be factorized. Note that a is intent(inout), and not only
! intent(in), since the row and column indices of the matrix
! stored in a are shifted by -1, and then again by +1, by the
! routine mld_dumf_fact, which is an interface to the UMFPACK
! C code performing the factorization.
! desc_a - type(psb_desc_type), input.
! The communication descriptor associated to a.
! p - type(mld_dbaseprc_type), input/output.
! The 'base preconditioner' data structure containing the pointers,
! p%iprcparm(mld_umf_symptr_) and p%iprcparm(mld_umf_numptr_),
! to the data structures used by UMFPACK for computing the LU
! factorization.
! info - integer, output.
! Error code.
!
subroutine mld_dumf_bld(a,desc_a,p,info)
use psb_base_mod
use mld_inner_mod, mld_protect_name => mld_dumf_bld
implicit none
! Arguments
type(psb_dspmat_type), intent(inout) :: a
type(psb_desc_type), intent(in) :: desc_a
type(mld_dbaseprc_type), intent(inout) :: p
integer, intent(out) :: info
! Local variables
integer :: nzt,ictxt,me,np,err_act
integer :: i_err(5)
character(len=20) :: name
info=0
name='mld_dumf_bld'
call psb_erractionsave(err_act)
ictxt = psb_cd_get_context(desc_a)
call psb_info(ictxt, me, np)
if (toupper(a%fida) /= 'CSC') then
info=135
call psb_errpush(info,name,a_err=a%fida)
goto 9999
endif
nzt = psb_sp_get_nnzeros(a)
!
! Compute the LU factorization
!
call mld_dumf_fact(a%m,nzt,&
& a%aspk,a%ia1,a%ia2,&
& p%iprcparm(mld_umf_symptr_),p%iprcparm(mld_umf_numptr_),info)
if (info /= 0) then
i_err(1) = info
info=4110
call psb_errpush(info,name,a_err='mld_umf_fact',i_err=i_err)
goto 9999
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
end subroutine mld_dumf_bld