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