!!$ !!$ !!$ 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_sslu_bld.f90 ! ! Subroutine: mld_sslu_bld ! Version: real ! ! This routine computes the LU factorization of the local part of the matrix ! stored into a, by using SuperLU. ! ! 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 structure allocated by SuperLU to store the L and U factors is ! pointed by p%iprcparm(mld_slu_ptr_). ! ! ! Arguments: ! a - type(psb_sspmat_type), input/output. ! The sparse matrix structure containing the local submatrix 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_slu_ptr_), to the data structure used by SuperLU ! to store the L and U factors. ! info - integer, output. ! Error code. ! subroutine mld_sslu_bld(a,desc_a,p,info) use psb_sparse_mod use mld_s_inner_mod, mld_protect_name => mld_sslu_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 :: ictxt,me,np,err_act character(len=20) :: name, ch_err if(psb_get_errstatus().ne.0) return info=psb_success_ name='mld_dslu_bld' call psb_erractionsave(err_act) ictxt = psb_cd_get_context(desc_a) call psb_info(ictxt, me, np) ! ! Compute the LU factorization ! select type(aa=>a%a) type is (psb_s_csr_sparse_mat) call mld_sslu_fact(aa%get_nrows(),aa%get_nzeros(),& & aa%val,aa%ja,aa%irp,p%iprcparm(mld_slu_ptr_),info) if (info /= psb_success_) then ch_err='mld_slu_fact' call psb_errpush(4110,name,a_err=ch_err,i_err=(/info,0,0,0,0/)) goto 9999 end if class default info=psb_err_unsupported_format_ ch_err=a%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_sslu_bld