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132 lines
6.2 KiB
Fortran
132 lines
6.2 KiB
Fortran
!
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!
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! MLD2P4 version 2.1
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! MultiLevel Domain Decomposition Parallel Preconditioners Package
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! based on PSBLAS (Parallel Sparse BLAS version 3.5)
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!
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! (C) Copyright 2008, 2010, 2012, 2015, 2017 , 2017
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!
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! Salvatore Filippone Cranfield University
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! Ambra Abdullahi Hassan University of Rome Tor Vergata
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! Pasqua D'Ambra IAC-CNR, Naples, IT
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! Daniela di Serafino University of Campania "L. Vanvitelli", Caserta, IT
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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 MLD2P4 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 MLD2P4 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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! The aggregator object hosts the aggregation method for building
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! the multilevel hierarchy. This variant is based on the hybrid method
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! presented in
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!
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! S. Gratton, P. Henon, P. Jiranek and X. Vasseur:
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! Reducing complexity of algebraic multigrid by aggregation
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! Numerical Lin. Algebra with Applications, 2016, 23:501-518
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!
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module mld_c_hybrid_aggregator_mod
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use mld_c_base_aggregator_mod
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!
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! sm - class(mld_T_base_smoother_type), allocatable
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! The current level preconditioner (aka smoother).
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! parms - type(mld_RTml_parms)
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! The parameters defining the multilevel strategy.
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! ac - The local part of the current-level matrix, built by
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! coarsening the previous-level matrix.
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! desc_ac - type(psb_desc_type).
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! The communication descriptor associated to the matrix
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! stored in ac.
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! base_a - type(psb_Tspmat_type), pointer.
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! Pointer (really a pointer!) to the local part of the current
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! matrix (so we have a unified treatment of residuals).
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! We need this to avoid passing explicitly the current matrix
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! to the routine which applies the preconditioner.
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! base_desc - type(psb_desc_type), pointer.
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! Pointer to the communication descriptor associated to the
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! matrix pointed by base_a.
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! map - Stores the maps (restriction and prolongation) between the
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! vector spaces associated to the index spaces of the previous
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! and current levels.
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!
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! Methods:
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! Most methods follow the encapsulation hierarchy: they take whatever action
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! is appropriate for the current object, then call the corresponding method for
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! the contained object.
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! As an example: the descr() method prints out a description of the
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! level. It starts by invoking the descr() method of the parms object,
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! then calls the descr() method of the smoother object.
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!
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! descr - Prints a description of the object.
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! default - Set default values
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! dump - Dump to file object contents
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! set - Sets various parameters; when a request is unknown
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! it is passed to the smoother object for further processing.
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! check - Sanity checks.
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! sizeof - Total memory occupation in bytes
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! get_nzeros - Number of nonzeros
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!
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!
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type, extends(mld_c_base_aggregator_type) :: mld_c_hybrid_aggregator_type
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contains
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procedure, pass(ag) :: bld_tprol => mld_c_hybrid_aggregator_build_tprol
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!!$ procedure, pass(ag) :: mat_asb => mld_c_base_aggregator_mat_asb
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!!$ procedure, pass(ag) :: update_level => mld_c_base_aggregator_update_level
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!!$ procedure, pass(ag) :: clone => mld_c_base_aggregator_clone
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!!$ procedure, pass(ag) :: free => mld_c_base_aggregator_free
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!!$ procedure, pass(ag) :: default => mld_c_base_aggregator_default
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procedure, nopass :: fmt => mld_c_hybrid_aggregator_fmt
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end type mld_c_hybrid_aggregator_type
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interface
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subroutine mld_c_hybrid_aggregator_build_tprol(ag,parms,a,desc_a,ilaggr,nlaggr,op_prol,info)
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import :: mld_c_hybrid_aggregator_type, psb_desc_type, psb_cspmat_type, psb_spk_, &
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& psb_ipk_, psb_long_int_k_, mld_sml_parms
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implicit none
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class(mld_c_hybrid_aggregator_type), target, intent(inout) :: ag
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type(mld_sml_parms), intent(inout) :: parms
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type(psb_cspmat_type), intent(in) :: a
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type(psb_desc_type), intent(in) :: desc_a
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integer(psb_ipk_), allocatable, intent(out) :: ilaggr(:),nlaggr(:)
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type(psb_cspmat_type), intent(out) :: op_prol
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integer(psb_ipk_), intent(out) :: info
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end subroutine mld_c_hybrid_aggregator_build_tprol
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end interface
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contains
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function mld_c_hybrid_aggregator_fmt() result(val)
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implicit none
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character(len=32) :: val
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val = "Hybrid Decoupled aggregation"
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end function mld_c_hybrid_aggregator_fmt
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end module mld_c_hybrid_aggregator_mod
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