!!$ !!$ !!$ MLD2P4 version 2.0 !!$ MultiLevel Domain Decomposition Parallel Preconditioners Package !!$ based on PSBLAS (Parallel Sparse BLAS version 3.3) !!$ !!$ (C) Copyright 2008, 2010, 2012, 2015 !!$ !!$ 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. 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File: mld_dcoarse_bld.f90 ! ! Subroutine: mld_dcoarse_bld ! Version: real ! ! This routine builds the matrix associated to the current level of the ! multilevel preconditioner from the matrix associated to the previous level, ! by using a smoothed aggregation technique (therefore, it also builds the ! prolongation and restriction operators mapping the current level to the ! previous one and vice versa). Then the routine builds the base preconditioner ! at the current level. ! The current level is regarded as the coarse one, while the previous as ! the fine one. This is in agreement with the fact that the routine is called, ! by mld_mlprec_bld, only on levels >=2. ! ! ! Arguments: ! a - type(psb_dspmat_type). ! The sparse matrix structure containing the local part of the ! fine-level matrix. ! desc_a - type(psb_desc_type), input. ! The communication descriptor of a. ! p - type(mld_d_onelev_type), input/output. ! The 'one-level' data structure containing the local part ! of the base preconditioner to be built as well as ! information concerning the prolongator and its transpose. ! info - integer, output. ! Error code. ! subroutine mld_dcoarse_bld(a,desc_a,p,info) use psb_base_mod use mld_d_inner_mod, mld_protect_name => mld_dcoarse_bld implicit none ! Arguments type(psb_dspmat_type), intent(in), target :: a type(psb_desc_type), intent(in), target :: desc_a type(mld_d_onelev_type), intent(inout),target :: p integer(psb_ipk_), intent(out) :: info ! Local variables character(len=20) :: name integer(psb_mpik_) :: ictxt, np, me integer(psb_ipk_) :: err_act integer(psb_ipk_), allocatable :: ilaggr(:), nlaggr(:) type(psb_dspmat_type) :: ac, op_prol,op_restr type(psb_d_coo_sparse_mat) :: acoo, bcoo type(psb_d_csr_sparse_mat) :: acsr1 integer(psb_ipk_) :: nzl, ntaggr integer(psb_ipk_) :: debug_level, debug_unit name='mld_dcoarse_bld' if (psb_get_errstatus().ne.0) return call psb_erractionsave(err_act) debug_unit = psb_get_debug_unit() debug_level = psb_get_debug_level() info = psb_success_ ictxt = desc_a%get_context() call psb_info(ictxt,me,np) if (.true.) then call mld_aggrmap_bld(p,& & a,desc_a,ilaggr,nlaggr,op_prol,info) else call mld_check_def(p%parms%ml_type,'Multilevel type',& & mld_mult_ml_,is_legal_ml_type) call mld_check_def(p%parms%aggr_alg,'Aggregation',& & mld_dec_aggr_,is_legal_ml_aggr_alg) call mld_check_def(p%parms%aggr_ord,'Ordering',& & mld_aggr_ord_nat_,is_legal_ml_aggr_ord) call mld_check_def(p%parms%aggr_thresh,'Aggr_Thresh',dzero,is_legal_d_aggr_thrs) select case(p%parms%aggr_alg) case (mld_dec_aggr_, mld_sym_dec_aggr_) ! ! Build a mapping between the row indices of the fine-level matrix ! and the row indices of the coarse-level matrix, according to a decoupled ! aggregation algorithm. This also defines a tentative prolongator from ! the coarse to the fine level. ! call mld_aggrmap_bld(p%parms%aggr_alg,p%parms%aggr_ord,p%parms%aggr_thresh,& & a,desc_a,ilaggr,nlaggr,op_prol,info) if (info /= psb_success_) then call psb_errpush(psb_err_from_subroutine_,name,a_err='mld_aggrmap_bld') goto 9999 end if case (mld_bcmatch_aggr_) write(0,*) 'Matching is not implemented yet ' info = -1111 call psb_errpush(psb_err_input_value_invalid_i_,name,& & i_err=(/ione,p%parms%aggr_alg,izero,izero,izero/)) goto 9999 case default info = -1 call psb_errpush(psb_err_input_value_invalid_i_,name,& & i_err=(/ione,p%parms%aggr_alg,izero,izero,izero/)) goto 9999 end select end if if(info /= psb_success_) then call psb_errpush(psb_err_from_subroutine_,name,a_err='mld_aggrmap_bld') goto 9999 end if if (.true.) then call mld_aggrmat_asb(p,& & a,desc_a,ilaggr,nlaggr,op_prol,info) else call mld_check_def(p%parms%aggr_kind,'Smoother',& & mld_smooth_prol_,is_legal_ml_aggr_kind) call mld_check_def(p%parms%coarse_mat,'Coarse matrix',& & mld_distr_mat_,is_legal_ml_coarse_mat) call mld_check_def(p%parms%aggr_filter,'Use filtered matrix',& & mld_no_filter_mat_,is_legal_aggr_filter) call mld_check_def(p%parms%smoother_pos,'smooth_pos',& & mld_pre_smooth_,is_legal_ml_smooth_pos) call mld_check_def(p%parms%aggr_omega_alg,'Omega Alg.',& & mld_eig_est_,is_legal_ml_aggr_omega_alg) call mld_check_def(p%parms%aggr_eig,'Eigenvalue estimate',& & mld_max_norm_,is_legal_ml_aggr_eig) call mld_check_def(p%parms%aggr_omega_val,'Omega',dzero,is_legal_d_omega) ! ! Build the coarse-level matrix from the fine-level one, starting from ! the mapping defined by mld_aggrmap_bld and applying the aggregation ! algorithm specified by p%iprcparm(mld_aggr_kind_) ! call mld_daggrmat_asb(a,desc_a,ilaggr,nlaggr,p%parms,ac,op_prol,op_restr,info) if(info /= psb_success_) then call psb_errpush(psb_err_from_subroutine_,name,a_err='mld_aggrmat_asb') goto 9999 end if ! Common code refactored here. ntaggr = sum(nlaggr) select case(p%parms%coarse_mat) case(mld_distr_mat_) call ac%mv_to(bcoo) if (p%parms%clean_zeros) call bcoo%clean_zeros(info) nzl = bcoo%get_nzeros() if (info == psb_success_) call psb_cdall(ictxt,p%desc_ac,info,nl=nlaggr(me+1)) if (info == psb_success_) call psb_cdins(nzl,bcoo%ia,bcoo%ja,p%desc_ac,info) if (info == psb_success_) call psb_cdasb(p%desc_ac,info) if (info == psb_success_) call psb_glob_to_loc(bcoo%ia(1:nzl),p%desc_ac,info,iact='I') if (info == psb_success_) call psb_glob_to_loc(bcoo%ja(1:nzl),p%desc_ac,info,iact='I') if (info /= psb_success_) then call psb_errpush(psb_err_internal_error_,name,& & a_err='Creating p%desc_ac and converting ac') goto 9999 end if if (debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & 'Assembld aux descr. distr.' call p%ac%mv_from(bcoo) call p%ac%set_nrows(p%desc_ac%get_local_rows()) call p%ac%set_ncols(p%desc_ac%get_local_cols()) call p%ac%set_asb() if (info /= psb_success_) then call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_sp_free') goto 9999 end if if (np>1) then call op_prol%mv_to(acsr1) nzl = acsr1%get_nzeros() call psb_glob_to_loc(acsr1%ja(1:nzl),p%desc_ac,info,'I') if(info /= psb_success_) then call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_glob_to_loc') goto 9999 end if call op_prol%mv_from(acsr1) endif call op_prol%set_ncols(p%desc_ac%get_local_cols()) if (np>1) then call op_restr%cscnv(info,type='coo',dupl=psb_dupl_add_) call op_restr%mv_to(acoo) nzl = acoo%get_nzeros() if (info == psb_success_) call psb_glob_to_loc(acoo%ia(1:nzl),p%desc_ac,info,'I') call acoo%set_dupl(psb_dupl_add_) if (info == psb_success_) call op_restr%mv_from(acoo) if (info == psb_success_) call op_restr%cscnv(info,type='csr') if(info /= psb_success_) then call psb_errpush(psb_err_internal_error_,name,& & a_err='Converting op_restr to local') goto 9999 end if end if ! ! Clip to local rows. ! call op_restr%set_nrows(p%desc_ac%get_local_rows()) if (debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & 'Done ac ' case(mld_repl_mat_) ! ! call psb_cdall(ictxt,p%desc_ac,info,mg=ntaggr,repl=.true.) if (info == psb_success_) call psb_cdasb(p%desc_ac,info) if ((info == psb_success_).and.p%parms%clean_zeros) call ac%clean_zeros(info) if (info == psb_success_) & & call psb_gather(p%ac,ac,p%desc_ac,info,dupl=psb_dupl_add_,keeploc=.false.) if (info /= psb_success_) goto 9999 case default info = psb_err_internal_error_ call psb_errpush(info,name,a_err='invalid mld_coarse_mat_') goto 9999 end select call p%ac%cscnv(info,type='csr',dupl=psb_dupl_add_) if(info /= psb_success_) then call psb_errpush(psb_err_from_subroutine_,name,a_err='spcnv') goto 9999 end if ! ! Copy the prolongation/restriction matrices into the descriptor map. ! op_restr => PR^T i.e. restriction operator ! op_prol => PR i.e. prolongation operator ! p%map = psb_linmap(psb_map_aggr_,desc_a,& & p%desc_ac,op_restr,op_prol,ilaggr,nlaggr) if (info == psb_success_) call op_prol%free() if (info == psb_success_) call op_restr%free() if(info /= psb_success_) then call psb_errpush(psb_err_from_subroutine_,name,a_err='sp_Free') goto 9999 end if ! ! Fix the base_a and base_desc pointers for handling of residuals. ! This is correct because this routine is only called at levels >=2. ! p%base_a => p%ac p%base_desc => p%desc_ac end if if(info /= psb_success_) then call psb_errpush(psb_err_from_subroutine_,name,a_err='mld_aggrmat_asb') goto 9999 end if call psb_erractionrestore(err_act) return 9999 call psb_error_handler(err_act) return end subroutine mld_dcoarse_bld