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321 lines
13 KiB
Fortran
321 lines
13 KiB
Fortran
!
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!
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! AMG4PSBLAS version 1.0
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! Algebraic Multigrid Package
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! based on PSBLAS (Parallel Sparse BLAS version 3.5)
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!
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! (C) Copyright 2020
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!
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! Salvatore Filippone
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! Pasqua D'Ambra
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! Fabio Durastante
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions
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! are met:
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! 1. Redistributions of source code must retain the above copyright
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! notice, this list of conditions and the following disclaimer.
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! 2. Redistributions in binary form must reproduce the above copyright
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! notice, this list of conditions, and the following disclaimer in the
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! documentation and/or other materials provided with the distribution.
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! 3. The name of the AMG4PSBLAS group or the names of its contributors may
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! not be used to endorse or promote products derived from this
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! software without specific written permission.
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!
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! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
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! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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! POSSIBILITY OF SUCH DAMAGE.
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!
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!
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! File: amg_c_smoothers_bld.f90
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!
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! Subroutine: amg_c_smoothers_bld
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! Version: complex
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!
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! This routine performs the final phase of the multilevel preconditioner
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! build process: builds the "smoother" objects at each level,
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! based on the matrix hierarchy prepared by amg_c_hierarchy_bld.
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!
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! A multilevel preconditioner is regarded as an array of 'one-level'
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! data structures, each containing the part of the
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! preconditioner associated to a certain level,
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! (for more details see the description of amg_Tonelev_type in amg_prec_type.f90).
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! The levels are numbered in increasing order starting from the finest one, i.e.
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! level 1 is the finest level. No transfer operators are associated to level 1.
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! Each level provides a "build" method; for the base type, the "one-level"
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! build procedure simply invokes the build method of the first smoother object,
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! and also on the second object if allocated.
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!
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!
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! Arguments:
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! a - type(psb_cspmat_type).
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! The sparse matrix structure containing the local part of the
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! matrix to be preconditioned.
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! desc_a - type(psb_desc_type), input.
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! The communication descriptor of a.
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! p - type(amg_cprec_type), input/output.
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! The preconditioner data structure containing the local part
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! of the preconditioner to be built.
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! info - integer, output.
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! Error code.
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!
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! amold - class(psb_c_base_sparse_mat), input, optional
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! Mold for the inner format of matrices contained in the
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! preconditioner
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!
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!
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! vmold - class(psb_c_base_vect_type), input, optional
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! Mold for the inner format of vectors contained in the
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! preconditioner
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!
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!
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!
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subroutine amg_c_smoothers_bld(a,desc_a,prec,info,amold,vmold,imold)
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use psb_base_mod
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!use amg_c_inner_mod
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use amg_c_prec_mod, amg_protect_name => amg_c_smoothers_bld
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Implicit None
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! Arguments
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type(psb_cspmat_type),intent(in), target :: a
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type(psb_desc_type), intent(inout), target :: desc_a
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class(amg_cprec_type),intent(inout),target :: prec
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integer(psb_ipk_), intent(out) :: info
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class(psb_c_base_sparse_mat), intent(in), optional :: amold
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class(psb_c_base_vect_type), intent(in), optional :: vmold
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class(psb_i_base_vect_type), intent(in), optional :: imold
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! Local Variables
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type(psb_ctxt_type) :: ctxt
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integer(psb_ipk_) :: me, np
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integer(psb_ipk_) :: err,i,k, err_act, iszv, newsz, nplevs, mxplevs
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real(psb_spk_) :: mnaggratio
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integer(psb_ipk_) :: coarse_solve_id
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integer(psb_ipk_) :: debug_level, debug_unit
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character(len=20) :: name, ch_err
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info=psb_success_
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err=0
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call psb_erractionsave(err_act)
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if (psb_errstatus_fatal()) then
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info = psb_err_internal_error_; goto 9999
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end if
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debug_unit = psb_get_debug_unit()
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debug_level = psb_get_debug_level()
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name = 'amg_c_smoothers_bld'
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info = psb_success_
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ctxt = desc_a%get_context()
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call psb_info(ctxt, me, np)
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if (me <0) then
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!!$ write(0,*) 'out of CTXT, should not do anything '
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goto 9998
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end if
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if (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),&
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& 'Entering '
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!
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if (.not.allocated(prec%precv)) then
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!! Error: should have called amg_cprecinit
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info=3111
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call psb_errpush(info,name)
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goto 9999
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end if
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!
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! Check to ensure all procs have the same
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!
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iszv = size(prec%precv)
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call psb_bcast(ctxt,iszv)
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if (iszv /= size(prec%precv)) then
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info=psb_err_internal_error_
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call psb_errpush(info,name,a_err='Inconsistent size of precv')
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goto 9999
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end if
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if (iszv < 1) then
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! We should never get here.
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info=psb_err_from_subroutine_
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ch_err='size bpv'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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endif
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!
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! Issue a warning for inconsistent changes to COARSE_SOLVE
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! but only if it really is a multilevel
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!
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if ((me == psb_root_).and.(iszv>1)) then
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coarse_solve_id = prec%precv(iszv)%parms%coarse_solve
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select case (coarse_solve_id)
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case(amg_umf_,amg_slu_)
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if (prec%precv(iszv)%sm%sv%get_id() /= coarse_solve_id) then
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write(psb_err_unit,*) &
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& 'MLD2P4: Warning: original coarse solver was requested as ',&
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& amg_fact_names(coarse_solve_id)
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if (prec%precv(iszv)%parms%coarse_mat == amg_repl_mat_) then
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write(psb_err_unit,*) ' but I am building ',&
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& amg_fact_names(prec%precv(iszv)%sm%sv%get_id())
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else if (prec%precv(iszv)%parms%coarse_mat == amg_distr_mat_) then
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write(psb_err_unit,*) ' but I am building BJAC with ',&
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& amg_fact_names(prec%precv(iszv)%sm%sv%get_id())
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else
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write(psb_err_unit,*) ' but I am building ',&
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& amg_fact_names(prec%precv(iszv)%sm%sv%get_id())
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end if
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write(psb_err_unit,*) 'This may happen if: '
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write(psb_err_unit,*) ' 1. coarse_subsolve has been reset, or '
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write(psb_err_unit,*) ' 2. the solver ', amg_fact_names(coarse_solve_id),&
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& ' was not configured at MLD2P4 build time, or'
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write(psb_err_unit,*) ' 3. an unsupported solver setup was specified.'
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end if
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if (prec%precv(iszv)%parms%coarse_mat /= amg_repl_mat_) then
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write(psb_err_unit,*) &
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& 'MLD2P4: Warning: original coarse matrix was requested as replicated', &
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& ' but it has been changed to distributed.'
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end if
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case(psb_ilu_n_, psb_ilu_t_,psb_milu_n_)
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if (prec%precv(iszv)%sm%sv%get_id() /= psb_ilu_n_) then
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write(psb_err_unit,*) &
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& 'MLD2P4: Warning: original coarse solver was requested as ',&
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& amg_fact_names(coarse_solve_id)
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if (prec%precv(iszv)%parms%coarse_mat == amg_repl_mat_) then
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write(psb_err_unit,*) ' but I am building ',&
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& amg_fact_names(prec%precv(iszv)%sm%sv%get_id())
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else if (prec%precv(iszv)%parms%coarse_mat == amg_distr_mat_) then
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write(psb_err_unit,*) ' but I am building BJAC with ',&
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& amg_fact_names(prec%precv(iszv)%sm%sv%get_id())
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else
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write(psb_err_unit,*) ' but I am building ',&
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& amg_fact_names(prec%precv(iszv)%sm%sv%get_id())
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end if
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write(psb_err_unit,*) &
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&'This may happen if coarse_subsolve has been reset'
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end if
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if (prec%precv(iszv)%parms%coarse_mat /= amg_repl_mat_) then
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write(psb_err_unit,*) &
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& 'MLD2P4: Warning: original coarse solver was requested as ',&
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& amg_fact_names(coarse_solve_id),&
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& ' but the coarse matrix has been changed to distributed'
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end if
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case(amg_mumps_)
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if (prec%precv(iszv)%sm%sv%get_id() /= amg_mumps_) then
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write(psb_err_unit,*) &
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& 'MLD2P4: Warning: original coarse solver was requested as ',&
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& amg_fact_names(coarse_solve_id)
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if (prec%precv(iszv)%parms%coarse_mat == amg_repl_mat_) then
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write(psb_err_unit,*) ' but I am building ',&
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& amg_fact_names(prec%precv(iszv)%sm%sv%get_id())
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else if (prec%precv(iszv)%parms%coarse_mat == amg_distr_mat_) then
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write(psb_err_unit,*) ' but I am building BJAC with ',&
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& amg_fact_names(prec%precv(iszv)%sm%sv%get_id())
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else
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write(psb_err_unit,*) ' but I am building ',&
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& amg_fact_names(prec%precv(iszv)%sm%sv%get_id())
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end if
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write(psb_err_unit,*) 'This may happen if: '
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write(psb_err_unit,*) ' 1. coarse_subsolve has been reset, or '
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write(psb_err_unit,*) ' 2. the solver ', amg_fact_names(coarse_solve_id),&
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& ' was not configured at MLD2P4 build time, or'
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write(psb_err_unit,*) ' 3. an unsupported solver setup was specified.'
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end if
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case(amg_sludist_)
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if (prec%precv(iszv)%sm%sv%get_id() /= coarse_solve_id) then
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write(psb_err_unit,*) &
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& 'MLD2P4: Warning: original coarse solver was requested as ',&
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& amg_fact_names(coarse_solve_id)
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if (prec%precv(iszv)%parms%coarse_mat == amg_repl_mat_) then
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write(psb_err_unit,*) ' but I am building ',&
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& amg_fact_names(prec%precv(iszv)%sm%sv%get_id())
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else if (prec%precv(iszv)%parms%coarse_mat == amg_distr_mat_) then
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write(psb_err_unit,*) ' but I am building BJAC with ',&
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& amg_fact_names(prec%precv(iszv)%sm%sv%get_id())
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else
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write(psb_err_unit,*) ' but I am building ',&
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& amg_fact_names(prec%precv(iszv)%sm%sv%get_id())
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end if
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write(psb_err_unit,*) 'This may happen if: '
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write(psb_err_unit,*) ' 1. coarse_subsolve has been reset, or '
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write(psb_err_unit,*) ' 2. the solver ', amg_fact_names(coarse_solve_id), &
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& ' was not configured at MLD2P4 build time, or'
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write(psb_err_unit,*) ' 3. an unsupported solver setup was specified.'
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end if
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if (prec%precv(iszv)%parms%coarse_mat /= amg_distr_mat_) then
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write(psb_err_unit,*) &
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& 'MLD2P4: Warning: original coarse solver was requested as ',&
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& amg_fact_names(coarse_solve_id),&
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& ' but the coarse matrix has been changed to replicated'
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end if
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case(amg_bjac_,amg_l1_bjac_,amg_jac_, amg_l1_jac_, amg_gs_, amg_fbgs_, amg_l1_gs_,amg_l1_fbgs_)
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if (prec%precv(iszv)%parms%coarse_mat /= amg_distr_mat_) then
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write(psb_err_unit,*) &
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& 'MLD2P4: Warning: original coarse solver was requested as ',&
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& amg_fact_names(coarse_solve_id),&
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& ' but the coarse matrix has been changed to replicated'
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end if
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case default
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! We should never get here.
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info=psb_err_from_subroutine_
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ch_err='unkn coarse_solve'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end select
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end if
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! Sanity check: need to ensure that the MUMPS local/global NZ
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! are handled correctly; this is controlled by local vs global solver.
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! From this point of view, REPL is LOCAL because it owns everyting.
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! Should really find a better way of handling this.
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if (prec%precv(iszv)%parms%coarse_mat == amg_repl_mat_) &
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& call prec%precv(iszv)%sm%sv%set('MUMPS_LOC_GLOB', amg_local_solver_,info)
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!
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! Now do the real build.
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!
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do i=1, iszv
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!
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! build the base preconditioner at level i
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!
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!!$ write(0,*) me,' Building at level ',i
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call prec%precv(i)%bld(info,amold=amold,vmold=vmold,imold=imold,ilv=i)
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if (info /= psb_success_) then
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write(ch_err,'(a,i7)') 'Error @ level',i
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call psb_errpush(psb_err_internal_error_,name,&
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& a_err=ch_err)
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goto 9999
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endif
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end do
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if (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),&
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& 'Exiting with',iszv,' levels'
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9998 continue
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call psb_erractionrestore(err_act)
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return
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9999 call psb_error_handler(err_act)
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return
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end subroutine amg_c_smoothers_bld
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