Initial version of hierarchy_rebld
Salvatore Filippone
4 years ago
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!
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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_d_hierarchy_bld.f90
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!
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! Subroutine: amg_d_hierarchy_bld
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! Version: real
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!
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! This routine builds the preconditioner according to the requirements made by
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! the user trough the subroutines amg_precinit and amg_precset.
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!
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! A multilevel preconditioner is regarded as an array of 'one-level' data structures,
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! each containing the part of the 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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!
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!
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! Arguments:
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! a - type(psb_dspmat_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_dprec_type), input/output.
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! The preconditioner data structure; upon exit it contains
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! the multilevel hierarchy of prolongators, restrictors
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! and coarse matrices.
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! info - integer, output.
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! Error code.
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!
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subroutine amg_d_hierarchy_rebld(a,desc_a,prec,info)
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use psb_base_mod
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use amg_d_inner_mod
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use amg_d_prec_mod, amg_protect_name => amg_d_hierarchy_rebld
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Implicit None
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! Arguments
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type(psb_dspmat_type),intent(in), target :: a
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type(psb_desc_type), intent(inout), target :: desc_a
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class(amg_dprec_type),intent(inout),target :: prec
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integer(psb_ipk_), intent(out) :: info
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! Local Variables
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integer(psb_ipk_) :: ictxt, me,np
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integer(psb_ipk_) :: err,i,k, err_act, iszv, newsz,&
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& nplevs, mxplevs
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integer(psb_lpk_) :: iaggsize, casize
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real(psb_dpk_) :: mnaggratio, sizeratio, athresh, aomega
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class(amg_d_base_smoother_type), allocatable :: coarse_sm, med_sm, &
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& med_sm2, coarse_sm2
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class(amg_d_base_aggregator_type), allocatable :: tmp_aggr
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type(amg_dml_parms) :: medparms, coarseparms
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integer(psb_lpk_), allocatable :: nlaggr(:)
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type(psb_d_coo_sparse_mat) :: coo_prol, coo_restr
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type(psb_d_csr_sparse_mat) :: acsr
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type(psb_desc_type), pointer :: p_desc_a
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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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integer(psb_ipk_), save :: idx_bldtp=-1, idx_matasb=-1
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logical, parameter :: do_timings=.false.
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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_d_hierarchy_bld'
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info = psb_success_
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ictxt = desc_a%get_context()
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call psb_info(ictxt, me, np)
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prec%ictxt = ictxt
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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_dprecinit
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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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iszv = size(prec%precv)
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do i=2, iszv
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call prec%precv(i-1)%base_a%cp_to(acsr)
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p_desc_a => prec%precv(i-1)%base_desc
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call prec%precv(i)%map%mat_V2U%cp_to(coo_prol)
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call prec%precv(i)%map%mat_U2V%cp_to(coo_restr)
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call amg_ptap(acsr,p_desc_a,prec%precv(i)%map%naggr,&
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& prec%precv(i)%parms,prec%precv(i)%ac,&
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& coo_prol,prec%precv(i)%desc_ac,coo_restr,info)
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end do
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call prec%cmp_complexity()
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call prec%cmp_avg_cr()
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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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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_d_hierarchy_rebld
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