!!$ !!$ !!$ 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_dmlprec_bld.f90 ! ! Subroutine: mld_dmlprec_bld ! Version: real ! ! This routine builds the preconditioner according to the requirements made by ! the user trough the subroutines mld_precinit and mld_precset. ! ! A multilevel preconditioner is regarded as an array of 'one-level' data structures, ! each containing the part of the preconditioner associated to a certain level, ! (for more details see the description of mld_Tonelev_type in mld_prec_type.f90). ! The levels are numbered in increasing order starting from the finest one, i.e. ! level 1 is the finest level. No transfer operators are associated to level 1. ! ! ! Arguments: ! a - type(psb_dspmat_type). ! The sparse matrix structure containing the local part of the ! matrix to be preconditioned. ! desc_a - type(psb_desc_type), input. ! The communication descriptor of a. ! p - type(mld_dprec_type), input/output. ! The preconditioner data structure containing the local part ! of the preconditioner to be built. ! info - integer, output. ! Error code. ! ! amold - class(psb_d_base_sparse_mat), input, optional ! Mold for the inner format of matrices contained in the ! preconditioner ! ! ! vmold - class(psb_d_base_vect_type), input, optional ! Mold for the inner format of vectors contained in the ! preconditioner ! ! ! subroutine mld_dmlprec_bld(a,desc_a,p,info,amold,vmold,imold) use psb_base_mod use mld_d_inner_mod, mld_protect_name => mld_dmlprec_bld use mld_d_prec_mod Implicit None ! Arguments type(psb_dspmat_type),intent(in), target :: a type(psb_desc_type), intent(inout), target :: desc_a type(mld_dprec_type),intent(inout),target :: p integer(psb_ipk_), intent(out) :: info class(psb_d_base_sparse_mat), intent(in), optional :: amold class(psb_d_base_vect_type), intent(in), optional :: vmold class(psb_i_base_vect_type), intent(in), optional :: imold !!$ character, intent(in), optional :: upd ! Local Variables integer(psb_ipk_) :: ictxt, me,np integer(psb_ipk_) :: err,i,k, err_act, iszv, newsz, casize, nplevs, mxplevs real(psb_dpk_) :: mnaggratio integer(psb_ipk_) :: ipv(mld_ifpsz_), val integer(psb_ipk_) :: int_err(5) character :: upd_ integer(psb_ipk_) :: debug_level, debug_unit character(len=20) :: name, ch_err 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() name = 'mld_dmlprec_bld' info = psb_success_ int_err(1) = 0 ictxt = desc_a%get_context() call psb_info(ictxt, me, np) if (debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & 'Entering ' ! ! For the time being we are commenting out the UPDATE argument ! we plan to resurrect it later. ! !$ if (present(upd)) then ! !$ if (debug_level >= psb_debug_outer_) & ! !$ & write(debug_unit,*) me,' ',trim(name),'UPD ', upd ! !$ ! !$ if ((psb_toupper(upd).eq.'F').or.(psb_toupper(upd).eq.'T')) then ! !$ upd_=psb_toupper(upd) ! !$ else ! !$ upd_='F' ! !$ endif ! !$ else ! !$ upd_='F' ! !$ endif upd_ = 'F' if (.not.allocated(p%precv)) then !! Error: should have called mld_dprecinit info=3111 call psb_errpush(info,name) goto 9999 end if ! ! Check to ensure all procs have the same ! newsz = -1 casize = p%coarse_aggr_size nplevs = p%n_prec_levs mxplevs = p%max_prec_levs mnaggratio = p%min_aggr_ratio casize = p%coarse_aggr_size iszv = size(p%precv) call psb_bcast(ictxt,iszv) call psb_bcast(ictxt,casize) call psb_bcast(ictxt,nplevs) call psb_bcast(ictxt,mxplevs) call psb_bcast(ictxt,mnaggratio) if (casize /= p%coarse_aggr_size) then info=psb_err_internal_error_ call psb_errpush(info,name,a_err='Inconsistent coarse_aggr_size') goto 9999 end if if (nplevs /= p%n_prec_levs) then info=psb_err_internal_error_ call psb_errpush(info,name,a_err='Inconsistent n_prec_levs') goto 9999 end if if (mxplevs /= p%max_prec_levs) then info=psb_err_internal_error_ call psb_errpush(info,name,a_err='Inconsistent max_prec_levs') goto 9999 end if if (mnaggratio /= p%min_aggr_ratio) then info=psb_err_internal_error_ call psb_errpush(info,name,a_err='Inconsistent min_aggr_ratio') goto 9999 end if if (iszv /= size(p%precv)) then info=psb_err_internal_error_ call psb_errpush(info,name,a_err='Inconsistent size of precv') goto 9999 end if if (iszv <= 1) then ! We should only ever get here for multilevel. info=psb_err_from_subroutine_ ch_err='size bpv' call psb_errpush(info,name,a_err=ch_err) goto 9999 endif if (nplevs <= 0) then ! ! This should become the default strategy, we specify a target aggregation size. ! if (casize <=0) then ! ! Default to the cubic root of the size at base level. ! casize = desc_a%get_global_rows() casize = int((done*casize)**(done/(done*3)),psb_ipk_) casize = max(casize,ione) end if call mld_bld_mlhier_aggsize(casize,mxplevs,mnaggratio,a,desc_a,p%precv,info) else ! ! Oldstyle with fixed number of levels. ! nplevs = max(itwo,min(nplevs,mxplevs)) call mld_bld_mlhier_array(nplevs,a,desc_a,p%precv,info) end if iszv = size(p%precv) ! ! Now do the preconditioner build. ! do i=1, iszv ! ! build the base preconditioner at level i ! call p%precv(i)%bld(info,amold=amold,vmold=vmold,imold=imold) if (info /= psb_success_) then write(ch_err,'(a,i7)') 'Error @ level',i call psb_errpush(psb_err_internal_error_,name,& & a_err=ch_err) goto 9999 endif end do if (debug_level >= psb_debug_outer_) & & write(debug_unit,*) me,' ',trim(name),& & 'Exiting with',iszv,' levels' call psb_erractionrestore(err_act) return 9999 call psb_error_handler(err_act) return end subroutine mld_dmlprec_bld