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amg4psblas/amgprec/amg_c_symdec_aggregator_mod...

106 lines
4.3 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.
!
!
!
!
! Locally symmetrized (decoupled) aggregation algorithm.
! This version differs from the basic decoupled aggregation algorithm
! only because it works on (the pattern of) A+A^T instead of A.
!
!
module amg_c_symdec_aggregator_mod
use amg_c_dec_aggregator_mod
!> \namespace amg_c_symdec_aggregator_mod \class amg_c_symdec_aggregator_type
!! \extends amg_c_dec_aggregator_mod::amg_c_dec_aggregator_type
!!
!! This version differs from the basic decoupled aggregation algorithm
!! only because it works on (the pattern of) A+A^T instead of A.
!!
!
type, extends(amg_c_dec_aggregator_type) :: amg_c_symdec_aggregator_type
contains
procedure, pass(ag) :: bld_tprol => amg_c_symdec_aggregator_build_tprol
procedure, pass(ag) :: descr => amg_c_symdec_aggregator_descr
procedure, nopass :: fmt => amg_c_symdec_aggregator_fmt
end type amg_c_symdec_aggregator_type
interface
subroutine amg_c_symdec_aggregator_build_tprol(ag,parms,ag_data,&
& a,desc_a,ilaggr,nlaggr,t_prol,info)
import :: amg_c_symdec_aggregator_type, psb_desc_type, psb_cspmat_type, psb_spk_, &
& psb_ipk_, psb_lpk_, psb_lcspmat_type, amg_sml_parms, amg_saggr_data
implicit none
class(amg_c_symdec_aggregator_type), target, intent(inout) :: ag
type(amg_sml_parms), intent(inout) :: parms
type(amg_saggr_data), intent(in) :: ag_data
type(psb_cspmat_type), intent(inout) :: a
type(psb_desc_type), intent(inout) :: desc_a
integer(psb_lpk_), allocatable, intent(out) :: ilaggr(:),nlaggr(:)
type(psb_lcspmat_type), intent(out) :: t_prol
integer(psb_ipk_), intent(out) :: info
end subroutine amg_c_symdec_aggregator_build_tprol
end interface
contains
function amg_c_symdec_aggregator_fmt() result(val)
implicit none
character(len=32) :: val
val = "Symmetric Decoupled aggregation"
end function amg_c_symdec_aggregator_fmt
subroutine amg_c_symdec_aggregator_descr(ag,parms,iout,info)
implicit none
class(amg_c_symdec_aggregator_type), intent(in) :: ag
type(amg_sml_parms), intent(in) :: parms
integer(psb_ipk_), intent(in) :: iout
integer(psb_ipk_), intent(out) :: info
write(iout,*) 'Decoupled Aggregator locally-symmetrized'
write(iout,*) 'Aggregator object type: ',ag%fmt()
call parms%mldescr(iout,info)
return
end subroutine amg_c_symdec_aggregator_descr
end module amg_c_symdec_aggregator_mod