!!$ !!$ !!$ MLD2P4 !!$ MultiLevel Domain Decomposition Parallel Preconditioners Package !!$ based on PSBLAS (Parallel Sparse BLAS v.2.0) !!$ !!$ (C) Copyright 2007 Alfredo Buttari University of Rome Tor Vergata !!$ Pasqua D'Ambra ICAR-CNR, Naples !!$ Daniela di Serafino Second University of Naples !!$ Salvatore Filippone University of Rome Tor Vergata !!$ !!$ 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_dasmat_bld.f90 ! ! Subroutine: mld_dasmat_bld ! Version: real ! ! This routine builds the communication descriptor associated to the extended ! matrices that form the Additive Schwarz (AS) preconditioner and retrieves ! the remote pieces needed to build the local extended matrix. If the ! preconditioner is the block-Jacobi one, the routine makes only a copy of ! the descriptor of the original matrix. ! ! ! Arguments: ! ptype - integer, input. ! The type of preconditioner to be built. Only the values ! mld_bjac_ and mld_as_ (see mld_prec_type.f90) are allowed. ! novr - integer, input. ! The number of overlap layers in the AS preconditioner. ! a - type(psb_dspmat_type), input. ! The sparse matrix structure containing the local part of the ! matrix to be preconditioned. ! blk - type(psb_dspmat_type), output. ! The sparse matrix structure containing the remote rows that ! extend the local matrix according to novr. If novr = 0 then ! blk does not contain any row. ! desc_data - type(psb_desc_type), input. ! The communication descriptor of the sparse matrix a. ! desc_p - type(psb_desc_type), output. ! The communication descriptor associated to the extended ! matrices that form the AS preconditioner. ! info - integer, output. ! Error code. ! outfmt - character(len=5), optional. ! The storage format of the local extended matrix for the AS ! preconditioner. Currently outfmt is set to 'CSR' by the ! calling routine mld_bjac_bld. ! subroutine mld_dasmat_bld(ptype,novr,a,blk,desc_data,upd,desc_p,info,outfmt) use psb_base_mod use mld_prec_mod, mld_protect_name => mld_dasmat_bld Implicit None ! Arguments integer, intent(in) :: ptype,novr Type(psb_dspmat_type), Intent(in) :: a Type(psb_dspmat_type), Intent(inout) :: blk integer, intent(out) :: info Type(psb_desc_type), Intent(inout) :: desc_p Type(psb_desc_type), Intent(in) :: desc_data Character, Intent(in) :: upd character(len=5), optional :: outfmt ! Local variables integer icomm Integer :: np,me,nnzero,& & ictxt, n_col,int_err(5),& & tot_recv, n_row,nhalo, nrow_a,err_act integer :: debug_level, debug_unit character(len=20) :: name, ch_err name='mld_dasmat_bld' if(psb_get_errstatus() /= 0) return info=0 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_data) icomm = psb_cd_get_mpic(desc_data) Call psb_info(ictxt, me, np) tot_recv=0 nrow_a = desc_data%matrix_data(psb_n_row_) nnzero = Size(a%aspk) n_col = desc_data%matrix_data(psb_n_col_) nhalo = n_col-nrow_a select case (ptype) case (mld_bjac_) ! ! Block-Jacobi preconditioner. Copy the descriptor, just in case ! we want to renumber the rows and columns of the matrix. ! call psb_sp_all(0,0,blk,1,info) if(info /= 0) then info=4010 ch_err='psb_sp_all' call psb_errpush(info,name,a_err=ch_err) goto 9999 end if blk%fida = 'COO' blk%infoa(psb_nnz_) = 0 If (upd == 'F') Then call psb_cdcpy(desc_data,desc_p,info) If(debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & ' done cdcpy' if(info /= 0) then info=4010 ch_err='psb_cdcpy' call psb_errpush(info,name,a_err=ch_err) goto 9999 end if endif case(mld_as_) ! ! Additive Schwarz ! if (novr < 0) then info=3 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 ! If(debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & ' calling allocate novr=0' call psb_sp_all(0,0,blk,1,info) if(info /= 0) then info=4010 ch_err='psb_sp_all' call psb_errpush(info,name,a_err=ch_err) goto 9999 end if blk%fida = 'COO' blk%infoa(psb_nnz_) = 0 if (debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & 'Calling desccpy' if (upd == 'F') then call psb_cdcpy(desc_data,desc_p,info) If(debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & ' done cdcpy' if(info /= 0) then info=4010 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 return endif 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_data,novr,desc_p,info,extype=psb_ovt_asov_) if (info /= 0) then info=4010 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),& & ' From cdbldext _:',desc_p%matrix_data(psb_n_row_),& & desc_p%matrix_data(psb_n_col_) ! ! Retrieve the remote pieces needed to build the local extended matrix ! n_row = desc_p%matrix_data(psb_n_row_) if (debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & 'Before sphalo ',blk%fida,blk%m,psb_nnz_,blk%infoa(psb_nnz_) Call psb_sphalo(a,desc_p,blk,info,& & outfmt=outfmt,data=psb_comm_ext_,rowscale=.true.) if (info /= 0) then info=4010 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 ',& & blk%fida,blk%m,psb_nnz_,blk%infoa(psb_nnz_) case default if(info /= 0) then info=4001 ch_err='Invalid ptype' call psb_errpush(info,name,a_err=ch_err) goto 9999 end if 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_dasmat_bld