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amg4psblas/amgprec/amg_d_hybrid_aggregator_mod...

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5.6 KiB
Fortran

!
!
! AMG4PSBLAS version 1.0
! Algebraic Multigrid Package
4 years ago
! based on PSBLAS (Parallel Sparse BLAS version 3.7)
!
! (C) Copyright 2020
!
! 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.
!
!
!
!
! The aggregator object hosts the aggregation method for building
! the multilevel hierarchy. This variant is based on the hybrid method
! presented in
!
! S. Gratton, P. Henon, P. Jiranek and X. Vasseur:
! Reducing complexity of algebraic multigrid by aggregation
! Numerical Lin. Algebra with Applications, 2016, 23:501-518
!
module amg_d_hybrid_aggregator_mod
use amg_d_dec_aggregator_mod
!
! sm - class(amg_T_base_smoother_type), allocatable
! The current level preconditioner (aka smoother).
! parms - type(amg_RTml_parms)
! The parameters defining the multilevel strategy.
! ac - The local part of the current-level matrix, built by
! coarsening the previous-level matrix.
! desc_ac - type(psb_desc_type).
! The communication descriptor associated to the matrix
! stored in ac.
! base_a - type(psb_Tspmat_type), pointer.
! Pointer (really a pointer!) to the local part of the current
! matrix (so we have a unified treatment of residuals).
! We need this to avoid passing explicitly the current matrix
! to the routine which applies the preconditioner.
! base_desc - type(psb_desc_type), pointer.
! Pointer to the communication descriptor associated to the
! matrix pointed by base_a.
! map - Stores the maps (restriction and prolongation) between the
! vector spaces associated to the index spaces of the previous
! and current levels.
!
! Methods:
! Most methods follow the encapsulation hierarchy: they take whatever action
! is appropriate for the current object, then call the corresponding method for
! the contained object.
! As an example: the descr() method prints out a description of the
! level. It starts by invoking the descr() method of the parms object,
! then calls the descr() method of the smoother object.
!
! descr - Prints a description of the object.
! default - Set default values
! dump - Dump to file object contents
! set - Sets various parameters; when a request is unknown
! it is passed to the smoother object for further processing.
! check - Sanity checks.
! sizeof - Total memory occupation in bytes
! get_nzeros - Number of nonzeros
!
!
type, extends(amg_d_dec_aggregator_type) :: amg_d_hybrid_aggregator_type
contains
procedure, pass(ag) :: bld_tprol => amg_d_hybrid_aggregator_build_tprol
procedure, nopass :: fmt => amg_d_hybrid_aggregator_fmt
end type amg_d_hybrid_aggregator_type
interface
subroutine amg_d_hybrid_aggregator_build_tprol(ag,parms,a,desc_a,ilaggr,nlaggr,op_prol,info)
import :: amg_d_hybrid_aggregator_type, psb_desc_type, psb_dspmat_type, psb_dpk_, &
& psb_ipk_, psb_long_int_k_, amg_dml_parms
implicit none
class(amg_d_hybrid_aggregator_type), target, intent(inout) :: ag
type(amg_dml_parms), intent(inout) :: parms
type(psb_dspmat_type), intent(in) :: a
type(psb_desc_type), intent(in) :: desc_a
integer(psb_ipk_), allocatable, intent(out) :: ilaggr(:),nlaggr(:)
type(psb_dspmat_type), intent(out) :: op_prol
integer(psb_ipk_), intent(out) :: info
end subroutine amg_d_hybrid_aggregator_build_tprol
end interface
contains
function amg_d_hybrid_aggregator_fmt() result(val)
implicit none
character(len=32) :: val
val = "Hybrid Decoupled aggregation"
end function amg_d_hybrid_aggregator_fmt
end module amg_d_hybrid_aggregator_mod