!!$ !!$ !!$ 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_sbaseprec_bld.f90 ! ! Subroutine: mld_sbaseprec_bld ! Version: real ! ! This routine builds a 'base preconditioner' related to a matrix A. ! In a multilevel framework, it is called by mld_mlprec_bld to build the ! base preconditioner at each level. ! ! Details on the base preconditioner to be built are stored in the iprcparm ! field of the base preconditioner data structure (for a description of this ! data structure see mld_prec_type.f90). ! ! ! Arguments: ! a - type(psb_sspmat_type). ! The sparse matrix structure containing the local part of the ! matrix A to be preconditioned. ! desc_a - type(psb_desc_type), input. ! The communication descriptor of a. ! p - type(mld_sbaseprec_type), input/output. ! The 'base preconditioner' data structure containing the local ! part of the preconditioner at the selected level. ! info - integer, output. ! Error code. ! upd - character, input, optional. ! If upd='F' then the base 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. ! subroutine mld_sbaseprec_bld(a,desc_a,p,info,upd) use psb_base_mod use mld_inner_mod, mld_protect_name => mld_sbaseprec_bld Implicit None ! Arguments type(psb_sspmat_type), target :: a type(psb_desc_type), intent(in), target :: desc_a type(mld_sbaseprec_type),intent(inout) :: p integer, intent(out) :: info character, intent(in), optional :: upd ! Local variables Integer :: err, n_row, n_col,ictxt, me,np,mglob, err_act character :: iupd integer :: debug_level, debug_unit character(len=20) :: name, ch_err if (psb_get_errstatus() /= 0) return name = 'mld_sbaseprec_bld' info=0 err=0 call psb_erractionsave(err_act) debug_unit = psb_get_debug_unit() debug_level = psb_get_debug_level() ictxt = psb_cd_get_context(desc_a) n_row = psb_cd_get_local_rows(desc_a) n_col = psb_cd_get_local_cols(desc_a) mglob = psb_cd_get_global_rows(desc_a) call psb_info(ictxt, me, np) if (debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),' start' if (present(upd)) then if (debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),'UPD ', upd if ((psb_toupper(UPD) == 'F').or.(psb_toupper(UPD) == 'T')) then IUPD=psb_toupper(UPD) else IUPD='F' endif else IUPD='F' endif ! ! Should add check to ensure all procs have the same... ! call mld_check_def(p%iprcparm(mld_smoother_type_),'base_prec',& & mld_diag_,is_legal_base_prec) call psb_nullify_desc(p%desc_data) select case(p%iprcparm(mld_smoother_type_)) case (mld_noprec_) ! No preconditioner ! Do nothing call psb_cdcpy(desc_a,p%desc_data,info) if(info /= 0) then info=4010 ch_err='psb_cdcpy' call psb_errpush(info,name,a_err=ch_err) goto 9999 end if case (mld_diag_) ! Diagonal preconditioner call mld_diag_bld(a,desc_a,p,info) if(debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & ': out of mld_diag_bld' if(info /= 0) then info=4010 ch_err='mld_diag_bld' call psb_errpush(info,name,a_err=ch_err) goto 9999 end if case(mld_bjac_,mld_as_) ! Additive Schwarz preconditioners/smoothers call mld_check_def(p%iprcparm(mld_sub_ovr_),'overlap',& & 0,is_legal_n_ovr) call mld_check_def(p%iprcparm(mld_sub_restr_),'restriction',& & psb_halo_,is_legal_restrict) call mld_check_def(p%iprcparm(mld_sub_prol_),'prolongator',& & psb_none_,is_legal_prolong) call mld_check_def(p%iprcparm(mld_sub_ren_),'renumbering',& & mld_renum_none_,is_legal_renum) call mld_check_def(p%iprcparm(mld_sub_solve_),'fact',& & mld_ilu_n_,is_legal_ml_fact) ! Set parameters for using SuperLU_dist on the local submatrices if (p%iprcparm(mld_sub_solve_)==mld_sludist_) then p%iprcparm(mld_sub_ovr_) = 0 p%iprcparm(mld_smoother_sweeps_) = 1 end if if (debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & ': Calling mld_as_bld' ! Build the local part of the base preconditioner/smoother call mld_as_bld(a,desc_a,p,iupd,info) if(info /= 0) then info=4010 call psb_errpush(info,name,a_err='mld_as_bld') goto 9999 end if case default info=4001 ch_err='Unknown mld_smoother_type_' call psb_errpush(info,name,a_err=ch_err) goto 9999 end select p%iprcparm(mld_prec_status_) = mld_prec_built_ 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_sbaseprec_bld