! ! ! AMG4PSBLAS version 1.0 ! Algebraic Multigrid Package ! based on PSBLAS (Parallel Sparse BLAS version 3.5) ! ! (C) Copyright 2020 ! ! Salvatore Filippone ! Pasqua D'Ambra ! Fabio Durastante ! ! 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. The name of the AMG4PSBLAS group or the names of its contributors may ! not be used to endorse or promote products derived from this ! software without specific written permission. ! ! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR ! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS ! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR ! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF ! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS ! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN ! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ! POSSIBILITY OF SUCH DAMAGE. ! ! ! File: amg_s_onelev_mat_asb.f90 ! ! Subroutine: amg_s_onelev_mat_asb ! 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 the user-specified aggregation technique (therefore, it also builds the ! prolongation and restriction operators mapping the current level to the ! previous one and vice versa). ! 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 amg_mlprec_bld, only on levels >=2. ! The main structure is: ! 1. Perform sanity checks; ! 2. Call amg_Xaggrmat_asb to compute prolongator/restrictor/AC ! 3. According to the choice of DIST/REPL for AC, build a descriptor DESC_AC, ! and adjust the column numbering of AC/OP_PROL/OP_RESTR ! 4. Pack restrictor and prolongator into p%linmap ! 5. Fix base_a and base_desc pointers. ! ! ! Arguments: ! p - type(amg_s_onelev_type), input/output. ! The 'one-level' data structure containing the control ! parameters and (eventually) coarse matrix and prolongator/restrictors. ! ! a - type(psb_sspmat_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. ! ilaggr - integer, dimension(:), input ! The mapping between the row indices of the coarse-level ! matrix and the row indices of the fine-level matrix. ! ilaggr(i)=j means that node i in the adjacency graph ! of the fine-level matrix is mapped onto node j in the ! adjacency graph of the coarse-level matrix. Note that the indices ! are assumed to be shifted so as to make sure the ranges on ! the various processes do not overlap. ! nlaggr - integer, dimension(:) input ! nlaggr(i) contains the aggregates held by process i. ! op_prol - type(psb_sspmat_type), input/output ! The tentative prolongator on input, released on output. ! ! info - integer, output. ! Error code. ! subroutine amg_s_base_onelev_mat_asb(lv,a,desc_a,ilaggr,nlaggr,t_prol,info) use psb_base_mod use amg_base_prec_type use amg_s_onelev_mod, amg_protect_name => amg_s_base_onelev_mat_asb implicit none ! Arguments class(amg_s_onelev_type), intent(inout), target :: lv type(psb_sspmat_type), intent(in) :: a type(psb_desc_type), intent(inout) :: desc_a integer(psb_lpk_), intent(inout) :: nlaggr(:) integer(psb_lpk_), intent(inout) :: ilaggr(:) type(psb_lsspmat_type), intent(inout) :: t_prol integer(psb_ipk_), intent(out) :: info ! Local variables character(len=24) :: name integer(psb_ipk_) :: ictxt, np, me integer(psb_ipk_) :: err_act type(psb_sspmat_type) :: ac, op_restr, op_prol integer(psb_ipk_) :: nzl, inl integer(psb_ipk_) :: debug_level, debug_unit name='amg_s_onelev_mat_asb' call psb_erractionsave(err_act) if (psb_errstatus_fatal()) then info = psb_err_internal_error_; goto 9999 end if 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) call amg_check_def(lv%parms%aggr_prol,'Smoother',& & amg_smooth_prol_,is_legal_ml_aggr_prol) call amg_check_def(lv%parms%coarse_mat,'Coarse matrix',& & amg_distr_mat_,is_legal_ml_coarse_mat) call amg_check_def(lv%parms%aggr_filter,'Use filtered matrix',& & amg_no_filter_mat_,is_legal_aggr_filter) call amg_check_def(lv%parms%aggr_omega_alg,'Omega Alg.',& & amg_eig_est_,is_legal_ml_aggr_omega_alg) call amg_check_def(lv%parms%aggr_eig,'Eigenvalue estimate',& & amg_max_norm_,is_legal_ml_aggr_eig) call amg_check_def(lv%parms%aggr_omega_val,'Omega',szero,is_legal_s_omega) ! ! Build the coarse-level matrix from the fine-level one, starting from ! the mapping defined by amg_aggrmap_bld and applying the aggregation ! algorithm specified by lv%iprcparm(amg_aggr_prol_) ! call lv%aggr%mat_bld(lv%parms,a,desc_a,ilaggr,nlaggr,& & lv%ac,lv%desc_ac,op_prol,op_restr,t_prol,info) if(info /= psb_success_) then call psb_errpush(psb_err_from_subroutine_,name,a_err='amg_aggrmat_asb') goto 9999 end if ! ! Now build its descriptor and convert global indices for ! ac, op_restr and op_prol ! if (info == psb_success_) & & call lv%aggr%mat_asb(lv%parms,a,desc_a,& & lv%ac,lv%desc_ac,op_prol,op_restr,info) if (info == psb_success_) call lv%ac%cscnv(info,type='csr',dupl=psb_dupl_add_) if (info == psb_success_) call lv%aggr%bld_map(desc_a, lv%desc_ac,& & ilaggr,nlaggr,op_restr,op_prol,lv%linmap,info) if(info /= psb_success_) then call psb_errpush(psb_err_from_subroutine_,name,a_err='mat_asb/map_bld') 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. ! lv%base_a => lv%ac lv%base_desc => lv%desc_ac call psb_erractionrestore(err_act) return 9999 call psb_error_handler(err_act) return end subroutine amg_s_base_onelev_mat_asb