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