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amg4psblas/mlprec/mld_zumf_bld.f90

137 lines
5.3 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_zumf_bld.f90
!
! Subroutine: mld_zumf_bld
! Version: complex
!
! This routine computes the LU factorization of the local part of the matrix
! stored into a, by using UMFPACK.
!
! The local 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_zspmat_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_zumf_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_zbaseprec_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_zumf_bld(a,desc_a,p,info)
use psb_base_mod
use mld_z_inner_mod, mld_protect_name => mld_zumf_bld
implicit none
! Arguments
type(psb_zspmat_type), intent(inout) :: a
type(psb_desc_type), intent(in) :: desc_a
type(mld_zbaseprec_type), intent(inout) :: p
integer, intent(out) :: info
! Local variables
integer :: ictxt,me,np,err_act
character(len=20) :: name, ch_err
info=psb_success_
name='mld_zumf_bld'
call psb_erractionsave(err_act)
ictxt = desc_a%get_context()
call psb_info(ictxt, me, np)
!
! Compute the LU factorization
!
select type(aa=>a%a)
!!$ type is (psb_z_csc_sparse_mat)
!!$ call mld_zumf_fact(aa%m,aa%get_nzeros(),&
!!$ & aa%val,aa%ia,aa%icp,&
!!$ & p%iprcparm(mld_umf_symptr_),p%iprcparm(mld_umf_numptr_),info)
!!$
!!$ if (info /= psb_success_) then
!!$ info=4110
!!$ call psb_errpush(info,name,a_err='mld_umf_fact',i_err=(/info,0,0,0,0/))
!!$ goto 9999
!!$ end if
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_zumf_bld