! ! ! MLD2P4 version 2.2 ! MultiLevel Domain Decomposition Parallel Preconditioners Package ! based on PSBLAS (Parallel Sparse BLAS version 3.5) ! ! (C) Copyright 2008-2018 ! ! Salvatore Filippone ! Pasqua D'Ambra ! Daniela di Serafino ! ! 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 MLD2P4 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 MLD2P4 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: mld_daggrmat_biz_asb.F90 ! ! Subroutine: mld_daggrmat_biz_asb ! Version: real ! ! This routine builds a coarse-level matrix A_C from a fine-level matrix A ! by using the Galerkin approach, i.e. ! ! A_C = P_C^T A P_C, ! ! where P_C is a prolongator from the coarse level to the fine one. ! ! This routine builds A_C according to a "bizarre" aggregation algorithm, ! using a "naive" prolongator proposed by the authors of MLD2P4. However, this ! prolongator still requires a deep analysis and testing and its use is not ! recommended. ! ! The coarse-level matrix A_C is distributed among the parallel processes or ! replicated on each of them, according to the value of p%parms%coarse_mat, ! specified by the user through mld_dprecinit and mld_zprecset. ! On output from this routine the entries of AC, op_prol, op_restr ! are still in "global numbering" mode; this is fixed in the calling routine ! mld_d_lev_aggrmat_asb. ! ! Arguments: ! a - type(psb_dspmat_type), input. ! The sparse matrix structure containing the local part of ! the fine-level matrix. ! desc_a - type(psb_desc_type), input. ! The communication descriptor of the fine-level matrix. ! p - type(mld_d_onelev_type), input/output. ! The 'one-level' data structure that will contain the local ! part of the matrix to be built as well as the information ! concerning the prolongator and its transpose. ! ilaggr - integer, dimension(:), allocatable. ! 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. ! nlaggr - integer, dimension(:), allocatable. ! nlaggr(i) contains the aggregates held by process i. ! info - integer, output. ! Error code. ! subroutine mld_daggrmat_biz_asb(a,desc_a,ilaggr,nlaggr,parms,ac,op_prol,op_restr,info) use psb_base_mod use mld_base_prec_type use mld_d_inner_mod, mld_protect_name => mld_daggrmat_biz_asb implicit none ! Arguments type(psb_dspmat_type), intent(in) :: a type(psb_desc_type), intent(in) :: desc_a integer(psb_ipk_), intent(inout) :: ilaggr(:), nlaggr(:) type(mld_dml_parms), intent(inout) :: parms type(psb_dspmat_type), intent(inout) :: op_prol type(psb_dspmat_type), intent(out) :: ac,op_restr integer(psb_ipk_), intent(out) :: info ! Local variables integer(psb_ipk_) :: nrow, nglob, ncol, ntaggr, ip, ndx,& & naggr, nzl,naggrm1,naggrp1, i, j, k, jd, icolF, nrw, err_act integer(psb_ipk_) ::ictxt, np, me character(len=20) :: name type(psb_dspmat_type) :: am3, am4,tmp_prol type(psb_d_coo_sparse_mat) :: tmpcoo type(psb_d_csr_sparse_mat) :: acsr1, acsr2, acsr3, acsrf, ptilde real(psb_dpk_), allocatable :: adiag(:) integer(psb_ipk_) :: ierr(5) logical :: filter_mat integer(psb_ipk_) :: debug_level, debug_unit integer(psb_ipk_), parameter :: ncmax=16 real(psb_dpk_) :: anorm, omega, tmp, dg, theta name='mld_aggrmat_biz_asb' if(psb_get_errstatus().ne.0) return info=psb_success_ call psb_erractionsave(err_act) debug_unit = psb_get_debug_unit() debug_level = psb_get_debug_level() ictxt = desc_a%get_context() ictxt = desc_a%get_context() call psb_info(ictxt, me, np) nglob = desc_a%get_global_rows() nrow = desc_a%get_local_rows() ncol = desc_a%get_local_cols() theta = parms%aggr_thresh naggr = nlaggr(me+1) ntaggr = sum(nlaggr) filter_mat = (parms%aggr_filter == mld_filter_mat_) ! naggr: number of local aggregates ! nrow: local rows. ! ! Get the diagonal D adiag = a%get_diag(info) if (info == psb_success_) & & call psb_realloc(ncol,adiag,info) if (info == psb_success_) & & call psb_halo(adiag,desc_a,info) if(info /= psb_success_) then call psb_errpush(psb_err_from_subroutine_,name,a_err='sp_getdiag') goto 9999 end if ! 1. Allocate Ptilde in sparse matrix form call op_prol%mv_to(tmpcoo) call ptilde%mv_from_coo(tmpcoo,info) if (info == psb_success_) call a%cscnv(acsr3,info,dupl=psb_dupl_add_) if (info /= psb_success_) goto 9999 if (debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & ' Initial copies sone.' if (filter_mat) then ! ! Build the filtered matrix Af from A ! if (info == psb_success_) call a%cscnv(acsrf,info,dupl=psb_dupl_add_) do i=1,nrow tmp = dzero jd = -1 do j=acsrf%irp(i),acsrf%irp(i+1)-1 if (acsrf%ja(j) == i) jd = j if (abs(acsrf%val(j)) < theta*sqrt(abs(adiag(i)*adiag(acsrf%ja(j))))) then tmp=tmp+acsrf%val(j) acsrf%val(j)=dzero endif enddo if (jd == -1) then write(0,*) 'Wrong input: we need the diagonal!!!!', i else acsrf%val(jd)=acsrf%val(jd)-tmp end if enddo ! Take out zeroed terms call acsrf%clean_zeros(info) end if do i=1,size(adiag) if (adiag(i) /= dzero) then adiag(i) = done / adiag(i) else adiag(i) = done end if end do if (filter_mat) call acsrf%scal(adiag,info) if (info == psb_success_) call acsr3%scal(adiag,info) if (info /= psb_success_) goto 9999 if (parms%aggr_omega_alg == mld_eig_est_) then if (parms%aggr_eig == mld_max_norm_) then ! ! This only works with CSR ! anorm = dzero dg = done nrw = acsr3%get_nrows() do i=1, nrw tmp = dzero do j=acsr3%irp(i),acsr3%irp(i+1)-1 if (acsr3%ja(j) <= nrw) then tmp = tmp + abs(acsr3%val(j)) endif if (acsr3%ja(j) == i ) then dg = abs(acsr3%val(j)) end if end do anorm = max(anorm,tmp/dg) enddo call psb_amx(ictxt,anorm) if (info /= psb_success_) then call psb_errpush(psb_err_internal_error_,name,a_err='Invalid AM3 storage format') goto 9999 end if omega = 4.d0/(3.d0*anorm) parms%aggr_omega_val = omega else info = psb_err_internal_error_ call psb_errpush(info,name,a_err='invalid mld_aggr_eig_') goto 9999 end if else if (parms%aggr_omega_alg == mld_user_choice_) then omega = parms%aggr_omega_val else if (parms%aggr_omega_alg /= mld_user_choice_) then info = psb_err_internal_error_ call psb_errpush(info,name,a_err='invalid mld_aggr_omega_alg_') goto 9999 end if if (filter_mat) then ! ! Build the smoothed prolongator using the filtered matrix ! do i=1,acsrf%get_nrows() do j=acsrf%irp(i),acsrf%irp(i+1)-1 if (acsrf%ja(j) == i) then acsrf%val(j) = done - omega*acsrf%val(j) else acsrf%val(j) = - omega*acsrf%val(j) end if end do end do if (debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & 'Done gather, going for SYMBMM 1' ! ! Symbmm90 does the allocation for its result. ! ! acsrm1 = (I-w*D*Af)Ptilde ! Doing it this way means to consider diag(Af_i) ! ! call psb_symbmm(acsrf,ptilde,acsr1,info) if(info /= psb_success_) then call psb_errpush(psb_err_from_subroutine_,name,a_err='symbmm 1') goto 9999 end if call psb_numbmm(acsrf,ptilde,acsr1) if (debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & 'Done NUMBMM 1' else ! ! Build the smoothed prolongator using the original matrix ! do i=1,acsr3%get_nrows() do j=acsr3%irp(i),acsr3%irp(i+1)-1 if (acsr3%ja(j) == i) then acsr3%val(j) = done - omega*acsr3%val(j) else acsr3%val(j) = - omega*acsr3%val(j) end if end do end do if (debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & 'Done gather, going for SYMBMM 1' ! ! Symbmm90 does the allocation for its result. ! ! acsrm1 = (I-w*D*A)Ptilde ! Doing it this way means to consider diag(A_i) ! ! call psb_symbmm(acsr3,ptilde,acsr1,info) if(info /= psb_success_) then call psb_errpush(psb_err_from_subroutine_,name,a_err='symbmm 1') goto 9999 end if call psb_numbmm(acsr3,ptilde,acsr1) if (debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & 'Done NUMBMM 1' end if call ptilde%free() call acsr1%set_dupl(psb_dupl_add_) call op_prol%mv_from(acsr1) call op_prol%clone(tmp_prol,info) call psb_rwextd(ncol,tmp_prol,info) if(info /= psb_success_) then call psb_errpush(psb_err_internal_error_,name,a_err='Halo of op_prol') goto 9999 end if call psb_symbmm(a,tmp_prol,am3,info) if(info /= psb_success_) then call psb_errpush(psb_err_from_subroutine_,name,a_err='symbmm 2') goto 9999 end if call psb_numbmm(a,tmp_prol,am3) if (debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & 'Done NUMBMM 2',parms%aggr_prol, mld_smooth_prol_ call tmp_prol%transp(op_restr) if (debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & 'starting sphalo/ rwxtd' call tmp_prol%free() call psb_rwextd(ncol,am3,info) if(info /= psb_success_) then call psb_errpush(psb_err_internal_error_,name,a_err='Extend am3') goto 9999 end if if (debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & 'starting symbmm 3' call psb_symbmm(op_restr,am3,ac,info) if (info == psb_success_) call psb_numbmm(op_restr,am3,ac) if (info == psb_success_) call am3%free() if (info == psb_success_) call ac%cscnv(info,type='coo',dupl=psb_dupl_add_) if (info /= psb_success_) then call psb_errpush(psb_err_internal_error_,name,a_err='Build b = op_restr x am3') goto 9999 end if if (debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & 'Done smooth_aggregate ' call psb_erractionrestore(err_act) return 9999 continue call psb_errpush(info,name) call psb_error_handler(err_act) return end subroutine mld_daggrmat_biz_asb