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amg4psblas/amgprec/impl/amg_s_hierarchy_rebld.f90

153 lines
5.5 KiB
Fortran

!
!
! AMG4PSBLAS version 1.0
! Algebraic Multigrid Package
! based on PSBLAS (Parallel Sparse BLAS version 3.7)
!
! (C) Copyright 2021
!
! 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_hierarchy_bld.f90
!
! Subroutine: amg_s_hierarchy_bld
! Version: real
!
! This routine builds the preconditioner according to the requirements made by
! the user trough the subroutines amg_precinit and amg_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 amg_Tonelev_type in amg_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(amg_dprec_type), input/output.
! The preconditioner data structure; upon exit it contains
! the multilevel hierarchy of prolongators, restrictors
! and coarse matrices.
! info - integer, output.
! Error code.
!
subroutine amg_s_hierarchy_rebld(a,desc_a,prec,info)
use psb_base_mod
use amg_s_inner_mod
use amg_s_prec_mod, amg_protect_name => amg_s_hierarchy_rebld
Implicit None
! Arguments
type(psb_sspmat_type),intent(in), target :: a
type(psb_desc_type), intent(inout), target :: desc_a
class(amg_sprec_type),intent(inout),target :: prec
integer(psb_ipk_), intent(out) :: info
! Local Variables
type(psb_ctxt_type) :: ctxt
integer(psb_ipk_) :: me, np
integer(psb_ipk_) :: err,i,k, err_act, iszv, newsz,&
& nplevs, mxplevs
integer(psb_lpk_) :: iaggsize, casize
real(psb_spk_) :: mnaggratio, sizeratio, athresh, aomega
class(amg_s_base_smoother_type), allocatable :: coarse_sm, med_sm, &
& med_sm2, coarse_sm2
class(amg_s_base_aggregator_type), allocatable :: tmp_aggr
type(amg_sml_parms) :: medparms, coarseparms
integer(psb_lpk_), allocatable :: nlaggr(:)
type(psb_s_coo_sparse_mat) :: coo_prol, coo_restr
type(psb_s_csr_sparse_mat) :: acsr
type(psb_desc_type), pointer :: p_desc_a
integer(psb_ipk_) :: debug_level, debug_unit
character(len=20) :: name, ch_err
info=psb_success_
err=0
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()
name = 'amg_hierarchy_rebld'
info = psb_success_
ctxt = desc_a%get_context()
call psb_info(ctxt, me, np)
prec%ctxt = ctxt
if (debug_level >= psb_debug_outer_) &
& write(debug_unit,*) me,' ',trim(name),&
& 'Entering '
!
if (.not.allocated(prec%precv)) then
!! Error: should have called amg_dprecinit
info=3111
call psb_errpush(info,name)
goto 9999
end if
iszv = size(prec%precv)
do i=2, iszv
call prec%precv(i-1)%base_a%cp_to(acsr)
p_desc_a => prec%precv(i-1)%base_desc
call prec%precv(i)%linmap%mat_V2U%cp_to(coo_prol)
call prec%precv(i)%linmap%mat_U2V%cp_to(coo_restr)
call amg_rap(acsr,p_desc_a,prec%precv(i)%linmap%naggr,&
& prec%precv(i)%parms,prec%precv(i)%ac,&
& coo_prol,prec%precv(i)%desc_ac,coo_restr,info)
end do
call prec%cmp_complexity()
call prec%cmp_avg_cr()
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 amg_s_hierarchy_rebld