!!$ !!$ !!$ 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. 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. !!$ !!$ ! ! Build an aggregation hierarchy with a target aggregation size ! ! subroutine mld_d_bld_mlhier_aggsize(casize,mxplevs,mnaggratio,a,desc_a,precv,info) use psb_base_mod use mld_d_inner_mod, mld_protect_name => mld_d_bld_mlhier_aggsize use mld_d_prec_mod implicit none integer(psb_ipk_), intent(in) :: casize,mxplevs real(psb_dpk_) :: mnaggratio type(psb_dspmat_type),intent(in), target :: a type(psb_desc_type), intent(inout), target :: desc_a type(mld_d_onelev_type), allocatable, target, intent(inout) :: precv(:) integer(psb_ipk_), intent(out) :: info ! Local integer(psb_ipk_) :: ictxt, me,np integer(psb_ipk_) :: err,i,k, err_act, iszv, newsz, iaggsize integer(psb_ipk_) :: ipv(mld_ifpsz_), val integer(psb_ipk_) :: int_err(5) character :: upd_ class(mld_d_base_smoother_type), allocatable :: coarse_sm, base_sm, med_sm type(mld_dml_parms) :: baseparms, medparms, coarseparms type(mld_d_onelev_node), pointer :: head, tail, newnode, current real(psb_dpk_) :: sizeratio integer(psb_ipk_) :: debug_level, debug_unit character(len=20) :: name, ch_err name = 'mld_bld_mlhier_aggsize' if (psb_get_errstatus().ne.0) return info=psb_success_ err=0 call psb_erractionsave(err_act) debug_unit = psb_get_debug_unit() debug_level = psb_get_debug_level() ictxt = desc_a%get_ctxt() call psb_info(ictxt,me,np) ! ! New strategy to build according to coarse size. ! iszv = size(precv) coarseparms = precv(iszv)%parms baseparms = precv(1)%parms medparms = precv(2)%parms allocate(coarse_sm, source=precv(iszv)%sm,stat=info) if (info == psb_success_) & & allocate(med_sm, source=precv(2)%sm,stat=info) if (info == psb_success_) & & allocate(base_sm, source=precv(1)%sm,stat=info) if (info /= psb_success_) then write(0,*) 'Error in saving smoothers',info call psb_errpush(psb_err_internal_error_,name,a_err='Base level precbuild.') goto 9999 end if ! ! Replicated matrix should only ever happen at coarse level. ! call mld_check_def(baseparms%coarse_mat,'Coarse matrix',& & mld_distr_mat_,is_distr_ml_coarse_mat) ! ! Now build a doubly linked list ! allocate(newnode,stat=info) if (info /= psb_success_) then info = psb_err_internal_error_ call psb_errpush(info,name,a_err='List start'); goto 9999 end if head => newnode tail => newnode newnode%item%base_a => a newnode%item%base_desc => desc_a newnode%item%parms = baseparms newsz = 1 current => head list_build_loop: do allocate(newnode,stat=info) if (info /= psb_success_) then info = psb_err_internal_error_ call psb_errpush(info,name,a_err='List start'); goto 9999 end if current%next => newnode newnode%prev => current newsz = newsz + 1 newnode%item%parms = medparms newnode%item%parms%aggr_thresh = current%item%parms%aggr_thresh/2 call mld_coarse_bld(current%item%base_a, current%item%base_desc, & & newnode%item,info) if (info /= psb_success_) then info = psb_err_internal_error_ call psb_errpush(info,name,a_err='build next level'); goto 9999 end if current => current%next tail => current iaggsize = sum(current%item%map%naggr) if (iaggsize <= casize) then ! ! Target reached; but we may need to rebuild. ! exit list_build_loop end if if (newsz>2) then sizeratio = iaggsize sizeratio = sum(current%prev%item%map%naggr)/sizeratio if (sizeratio < mnaggratio) then ! ! We are not gaining ! newsz = newsz-1 current => current%prev current%next =>null() call newnode%item%free(info) if (info == psb_success_) deallocate(newnode,stat=info) if (info /= psb_success_) then info = psb_err_internal_error_ call psb_errpush(info,name,a_err='Deallocate at list end'); goto 9999 end if exit list_build_loop end if end if end do list_build_loop ! ! At this point, we are at the list tail, ! and it needs to be rebuilt in case the parms were ! different. ! ! But the threshold has to be fixed before rebuliding coarseparms%aggr_thresh = current%item%parms%aggr_thresh current%item%parms = coarseparms call mld_coarse_bld(current%prev%item%base_a,& & current%prev%item%base_desc, & & current%item,info) if (info /= psb_success_) then info = psb_err_internal_error_ call psb_errpush(info,name,a_err='build next level'); goto 9999 end if ! ! Ok, now allocate the output vector and fix items. ! do i=1,iszv if (info == psb_success_) call precv(i)%free(info) end do if (info == psb_success_) deallocate(precv,stat=info) if (info == psb_success_) allocate(precv(newsz),stat=info) if (info /= psb_success_) then info = psb_err_internal_error_ call psb_errpush(info,name,a_err='Reallocate precv'); goto 9999 end if newnode => head do i=1, newsz current => newnode ! First do a move_alloc. ! This handles the AC, DESC_AC and MAP fields if (info == psb_success_) & & call current%item%move_alloc(precv(i),info) ! Now set the smoother/solver parts. if (info == psb_success_) then if (i ==1) then ! This is a workaround for a bug in gfortran 4.7.2 allocate(precv(i)%sm,source=base_sm,stat=info) else if (i < newsz) then allocate(precv(i)%sm,source=med_sm,stat=info) else allocate(precv(i)%sm,source=coarse_sm,stat=info) end if end if if (info /= psb_success_) then info = psb_err_internal_error_ call psb_errpush(info,name,a_err='list cpy'); goto 9999 end if if (i == 1) then precv(i)%base_a => a precv(i)%base_desc => desc_a else precv(i)%base_a => precv(i)%ac precv(i)%base_desc => precv(i)%desc_ac precv(i)%map%p_desc_X => precv(i-1)%base_desc precv(i)%map%p_desc_Y => precv(i)%base_desc end if newnode => current%next deallocate(current) end do call base_sm%free(info) if (info == psb_success_) call med_sm%free(info) if (info == psb_success_) call coarse_sm%free(info) if (info == psb_success_) deallocate(coarse_sm,med_sm,base_sm,stat=info) if (info /= psb_success_) then info = psb_err_internal_error_ call psb_errpush(info,name,a_err='final cleanup'); goto 9999 end if iszv = newsz call psb_erractionrestore(err_act) return 9999 call psb_error_handler(err_act) return end subroutine mld_d_bld_mlhier_aggsize