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amg4psblas/mlprec/impl/mld_c_lev_aggrmap_bld.f90

160 lines
6.3 KiB
Fortran

!
!
! MLD2P4 version 2.1
! MultiLevel Domain Decomposition Parallel Preconditioners Package
! based on PSBLAS (Parallel Sparse BLAS version 3.4)
!
! (C) Copyright 2008, 2010, 2012, 2015, 2017
!
! Salvatore Filippone Cranfield University
! Ambra Abdullahi Hassan University of Rome Tor Vergata
! Alfredo Buttari CNRS-IRIT, Toulouse
! Pasqua D'Ambra ICAR-CNR, Naples
! Daniela di Serafino University of Campania "L. Vanvitelli", Caserta
!
! 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.
!
!
! File: mld_c_lev_aggrmap_bld.f90
!
! Subroutine: mld_c_lev_aggrmap_bld
! Version: complex
!
! This routine is just an interface to aggrmap_bld where the real work is performed.
! It takes care of some consistency checking though.
!
! See mld_caggrmap_bld for constraints on input/oput arguments.
!
!
! Arguments:
! p - type(mld_c_onelev_type), input/output.
! The 'one-level' data structure containing the control
! parameters and (eventually) coarse matrix and prolongator/restrictors.
!
! a - type(psb_cspmat_type).
! The sparse matrix structure containing the local part of the
! fine-level matrix.
! desc_a - type(psb_desc_type), input.
! The communication descriptor of a.
! ilaggr - integer, dimension(:), allocatable, output
! The mapping between the row indices of the coarse-level
! matrix and the row indices of the fine-level matrix.
! ilaggr(i)=j means that node i in the adjacency graph
! of the fine-level matrix is mapped onto node j in the
! adjacency graph of the coarse-level matrix. Note that on exit the indices
! will be shifted so as to make sure the ranges on the various processes do not
! overlap.
! nlaggr - integer, dimension(:), allocatable, output
! nlaggr(i) contains the aggregates held by process i.
! op_prol - type(psb_cspmat_type), output
! The tentative prolongator, based on ilaggr.
!
! info - integer, output.
! Error code.
!
subroutine mld_c_lev_aggrmap_bld(p,a,desc_a,ilaggr,nlaggr,op_prol,info)
use psb_base_mod
use mld_base_prec_type
use mld_c_inner_mod, mld_protect_name => mld_c_lev_aggrmap_bld
implicit none
! Arguments
type(mld_c_onelev_type), intent(inout), target :: p
type(psb_cspmat_type), intent(in) :: a
type(psb_desc_type), intent(in) :: desc_a
integer(psb_ipk_), allocatable, intent(out) :: ilaggr(:),nlaggr(:)
type(psb_cspmat_type), intent(out) :: op_prol
integer(psb_ipk_), intent(out) :: info
! Local variables
character(len=20) :: name
integer(psb_mpik_) :: ictxt, np, me
integer(psb_ipk_) :: err_act
integer(psb_ipk_) :: nzl, ntaggr
integer(psb_ipk_) :: debug_level, debug_unit
name='mld_c_lev_aggrmap_bld'
if (psb_get_errstatus().ne.0) return
call psb_erractionsave(err_act)
debug_unit = psb_get_debug_unit()
debug_level = psb_get_debug_level()
info = psb_success_
ictxt = desc_a%get_context()
call psb_info(ictxt,me,np)
call mld_check_def(p%parms%ml_cycle,'Multilevel cycle',&
& mld_mult_ml_,is_legal_ml_cycle)
call mld_check_def(p%parms%par_aggr_alg,'Aggregation',&
& mld_dec_aggr_,is_legal_ml_par_aggr_alg)
call mld_check_def(p%parms%aggr_ord,'Ordering',&
& mld_aggr_ord_nat_,is_legal_ml_aggr_ord)
call mld_check_def(p%parms%aggr_thresh,'Aggr_Thresh',szero,is_legal_s_aggr_thrs)
select case(p%parms%par_aggr_alg)
case (mld_dec_aggr_, mld_sym_dec_aggr_)
!
! Build a mapping between the row indices of the fine-level matrix
! and the row indices of the coarse-level matrix, according to a decoupled
! aggregation algorithm. This also defines a tentative prolongator from
! the coarse to the fine level.
!
call mld_aggrmap_bld(p%parms%par_aggr_alg,p%parms%aggr_ord,p%parms%aggr_thresh,&
& a,desc_a,ilaggr,nlaggr,op_prol,info)
if (info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='mld_aggrmap_bld')
goto 9999
end if
case (mld_bcmatch_aggr_)
write(0,*) 'Matching is not implemented yet '
info = -1111
call psb_errpush(psb_err_input_value_invalid_i_,name,&
& i_err=(/ione,p%parms%par_aggr_alg,izero,izero,izero/))
goto 9999
case default
info = -1
call psb_errpush(psb_err_input_value_invalid_i_,name,&
& i_err=(/ione,p%parms%par_aggr_alg,izero,izero,izero/))
goto 9999
end select
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(err_act)
return
end subroutine mld_c_lev_aggrmap_bld