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!!$
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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 3.3)
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!!$
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!!$ (C) Copyright 2008, 2010, 2012, 2015
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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_dslu_bld.f90
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!
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! Subroutine: mld_dslu_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 SuperLU.
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!
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! The local 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 structure allocated by SuperLU to store the L and U factors is
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! pointed by p%iprcparm(mld_slu_ptr_).
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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 to
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! 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_dbaseprec_type), input/output.
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! The 'base preconditioner' data structure containing the pointer,
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! p%iprcparm(mld_slu_ptr_), to the data structure used by SuperLU
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! 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_dslu_bld(a,desc_a,p,info)
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use psb_base_mod
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use mld_d_inner_mod, mld_protect_name => mld_dslu_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_dbaseprec_type), intent(inout) :: p
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integer, intent(out) :: info
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! Local variables
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integer :: ictxt,me,np,err_act
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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_dslu_bld'
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call psb_erractionsave(err_act)
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ictxt = desc_a%get_context()
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call psb_info(ictxt, me, np)
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!
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! Compute the LU factorization
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!
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select type(aa=>a%a)
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type is (psb_d_csr_sparse_mat)
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call mld_dslu_fact(aa%get_nrows(),aa%get_nzeros(),&
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& aa%val,aa%ja,aa%irp,p%iprcparm(mld_slu_ptr_),info)
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if (info /= psb_success_) then
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ch_err='mld_slu_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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class default
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info=psb_err_unsupported_format_
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ch_err=a%get_fmt()
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end select
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call psb_erractionrestore(err_act)
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return
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9999 call psb_error_handler(err_act)
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return
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end subroutine mld_dslu_bld
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