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115 lines
4.5 KiB
Fortran
115 lines
4.5 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 3.7)
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!
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! (C) Copyright 2021
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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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!
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!
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! Locally symmetrized (decoupled) aggregation algorithm.
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! This version differs from the basic decoupled aggregation algorithm
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! only because it works on (the pattern of) A+A^T instead of A.
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!
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!
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module amg_z_symdec_aggregator_mod
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use amg_z_dec_aggregator_mod
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!> \namespace amg_z_symdec_aggregator_mod \class amg_z_symdec_aggregator_type
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!! \extends amg_z_dec_aggregator_mod::amg_z_dec_aggregator_type
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!!
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!! This version differs from the basic decoupled aggregation algorithm
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!! only because it works on (the pattern of) A+A^T instead of A.
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!!
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!
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type, extends(amg_z_dec_aggregator_type) :: amg_z_symdec_aggregator_type
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contains
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procedure, pass(ag) :: bld_tprol => amg_z_symdec_aggregator_build_tprol
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procedure, pass(ag) :: descr => amg_z_symdec_aggregator_descr
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procedure, nopass :: fmt => amg_z_symdec_aggregator_fmt
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end type amg_z_symdec_aggregator_type
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interface
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subroutine amg_z_symdec_aggregator_build_tprol(ag,parms,ag_data,&
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& a,desc_a,ilaggr,nlaggr,t_prol,info)
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import :: amg_z_symdec_aggregator_type, psb_desc_type, psb_zspmat_type, psb_dpk_, &
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& psb_ipk_, psb_lpk_, psb_lzspmat_type, amg_dml_parms, amg_daggr_data
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implicit none
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class(amg_z_symdec_aggregator_type), target, intent(inout) :: ag
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type(amg_dml_parms), intent(inout) :: parms
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type(amg_daggr_data), intent(in) :: ag_data
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type(psb_zspmat_type), intent(inout) :: a
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type(psb_desc_type), intent(inout) :: desc_a
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integer(psb_lpk_), allocatable, intent(out) :: ilaggr(:),nlaggr(:)
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type(psb_lzspmat_type), intent(out) :: t_prol
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integer(psb_ipk_), intent(out) :: info
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end subroutine amg_z_symdec_aggregator_build_tprol
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end interface
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contains
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function amg_z_symdec_aggregator_fmt() result(val)
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implicit none
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character(len=32) :: val
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val = "Symmetric Decoupled aggregation"
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end function amg_z_symdec_aggregator_fmt
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subroutine amg_z_symdec_aggregator_descr(ag,parms,iout,info,prefix)
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implicit none
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class(amg_z_symdec_aggregator_type), intent(in) :: ag
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type(amg_dml_parms), intent(in) :: parms
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integer(psb_ipk_), intent(in) :: iout
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integer(psb_ipk_), intent(out) :: info
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character(len=*), intent(in), optional :: prefix
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character(1024) :: prefix_
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if (present(prefix)) then
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prefix_ = prefix
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else
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prefix_ = ""
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end if
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write(iout,*) trim(prefix_),' ','Decoupled Aggregator locally-symmetrized'
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write(iout,*) trim(prefix_),' ','Aggregator object type: ',ag%fmt()
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call parms%mldescr(iout,info,prefix=prefix)
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return
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end subroutine amg_z_symdec_aggregator_descr
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end module amg_z_symdec_aggregator_mod
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