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271 lines
9.0 KiB
Fortran
271 lines
9.0 KiB
Fortran
!!$
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!!$
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!!$ MLD2P4 version 1.1
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!!$ MultiLevel Domain Decomposition Parallel Preconditioners Package
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!!$ based on PSBLAS (Parallel Sparse BLAS version 2.3.1)
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!!$
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!!$ (C) Copyright 2008,2009
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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_das_bld.f90
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!
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! Subroutine: mld_das_bld
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! Version: real
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!
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! This routine builds Additive Schwarz (AS) preconditioners. If the AS
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! preconditioner is actually the block-Jacobi one, the routine makes only a
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! copy of the descriptor of the original matrix and then calls mld_fact_bld
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! to perform an LU or ILU factorization of the diagonal blocks of the
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! distributed matrix.
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!
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!
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! Arguments:
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! a - type(psb_dspmat_type), input.
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! The sparse matrix structure containing the local part of the
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! matrix to be preconditioned.
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! desc_a - type(psb_desc_type), input.
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! The communication descriptor of the sparse matrix a.
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! p - type(mld_dbaseprec_type), input/output.
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! The 'base preconditioner' data structure containing the local
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! part of the preconditioner or solver to be built.
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! upd - character, input.
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! If upd='F' then the preconditioner is built from scratch;
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! if upd=T' then the matrix to be preconditioned has the same
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! sparsity pattern of a matrix that has been previously
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! preconditioned, hence some information is reused in building
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! the new preconditioner.
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! info - integer, output.
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! Error code.
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!
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subroutine mld_das_bld(a,desc_a,p,upd,info)
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use psb_sparse_mod
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use mld_inner_mod, mld_protect_name => mld_das_bld
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Implicit None
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! Arguments
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type(psb_d_sparse_mat), intent(in), target :: 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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character, intent(in) :: upd
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integer, intent(out) :: info
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! Local variables
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integer :: ptype,novr
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integer :: icomm
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Integer :: np,me,nnzero,ictxt, int_err(5),&
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& tot_recv, n_row,n_col,nhalo, err_act, data_
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type(psb_d_sparse_mat) :: blck
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integer :: debug_level, debug_unit
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character(len=20) :: name, ch_err
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name='mld_as_bld'
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if(psb_get_errstatus() /= 0) return
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info=psb_success_
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call psb_erractionsave(err_act)
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debug_unit = psb_get_debug_unit()
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debug_level = psb_get_debug_level()
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If (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),&
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& ' start ', upd
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ictxt = psb_cd_get_context(desc_a)
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icomm = psb_cd_get_mpic(desc_a)
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Call psb_info(ictxt, me, np)
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tot_recv=0
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n_row = psb_cd_get_local_rows(desc_a)
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n_col = psb_cd_get_local_cols(desc_a)
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nnzero = a%get_nzeros()
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nhalo = n_col-n_row
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ptype = p%iprcparm(mld_smoother_type_)
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novr = p%iprcparm(mld_sub_ovr_)
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select case (ptype)
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case(mld_bjac_)
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!
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! Block Jacobi
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!
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data_ = psb_no_comm_
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if (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),&
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& 'Calling desccpy'
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if (upd == 'F') then
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call psb_cdcpy(desc_a,p%desc_data,info)
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If(debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),&
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& ' done cdcpy'
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='psb_cdcpy'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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if (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),&
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& 'Early return: P>=3 N_OVR=0'
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endif
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call mld_fact_bld(a,p,upd,info)
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if (info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='mld_fact_bld'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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case(mld_as_)
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!
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! Additive Schwarz
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!
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if (novr < 0) then
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info=psb_err_invalid_ovr_num_
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int_err(1)=novr
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call psb_errpush(info,name,i_err=int_err)
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goto 9999
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endif
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if ((novr == 0).or.(np == 1)) then
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!
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! Actually, this is just block Jacobi
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!
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data_ = psb_no_comm_
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if (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),&
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& 'Calling desccpy'
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if (upd == 'F') then
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call psb_cdcpy(desc_a,p%desc_data,info)
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If(debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),&
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& ' done cdcpy'
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='psb_cdcpy'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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if (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),&
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& 'Early return: P>=3 N_OVR=0'
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endif
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call blck%csall(0,0,info,1)
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else
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If (upd == 'F') Then
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!
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! Build the auxiliary descriptor desc_p%matrix_data(psb_n_row_).
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! This is done by psb_cdbldext (interface to psb_cdovr), which is
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! independent of CSR, and has been placed in the tools directory
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! of PSBLAS, instead of the mlprec directory of MLD2P4, because it
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! might be used independently of the AS preconditioner, to build
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! a descriptor for an extended stencil in a PDE solver.
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!
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call psb_cdbldext(a,desc_a,novr,p%desc_data,info,extype=psb_ovt_asov_)
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if(debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),&
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& ' From cdbldext _:',psb_cd_get_local_rows(p%desc_data),&
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& psb_cd_get_local_cols(p%desc_data)
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if (info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='psb_cdbldext'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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Endif
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if (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),&
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& 'Before sphalo '
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!
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! Retrieve the remote sparse matrix rows required for the AS extended
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! matrix
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data_ = psb_comm_ext_
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Call psb_sphalo(a,p%desc_data,blck,info,data=data_,rowscale=.true.)
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if (info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='psb_sphalo'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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if (debug_level >=psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),&
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& 'After psb_sphalo ',&
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& blck%get_nrows(), blck%get_nzeros()
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End if
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call mld_fact_bld(a,p,upd,info,blck=blck)
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if (info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='mld_fact_bld'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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case default
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info=psb_err_internal_error_
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ch_err='Invalid ptype'
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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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if (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),'Done'
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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_das_bld
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