! ! ! MLD2P4 version 2.2 ! MultiLevel Domain Decomposition Parallel Preconditioners Package ! based on PSBLAS (Parallel Sparse BLAS version 3.5) ! ! (C) Copyright 2008-2018 ! ! Salvatore Filippone ! Pasqua D'Ambra ! Daniela di Serafino ! ! 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. ! ! ! ! ! The aggregator object hosts the aggregation method for building ! the multilevel hierarchy. ! ! M. Brezina and P. Vanek, A black-box iterative solver based on a ! two-level Schwarz method, Computing, 63 (1999), 233-263. ! P. D'Ambra, D. di Serafino and S. Filippone, On the development of ! PSBLAS-based parallel two-level Schwarz preconditioners, Appl. Num. Math. ! 57 (2007), 1181-1196. ! module mld_c_dec_aggregator_mod use mld_c_base_aggregator_mod ! ! sm - class(mld_T_base_smoother_type), allocatable ! The current level preconditioner (aka smoother). ! parms - type(mld_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(mld_c_base_aggregator_type) :: mld_c_dec_aggregator_type procedure(mld_c_map_bld), nopass, pointer :: map_bld => null() contains procedure, pass(ag) :: bld_tprol => mld_c_dec_aggregator_build_tprol procedure, pass(ag) :: mat_asb => mld_c_dec_aggregator_mat_asb procedure, pass(ag) :: default => mld_c_dec_aggregator_default procedure, pass(ag) :: set_aggr_type => mld_c_dec_aggregator_set_aggr_type procedure, nopass :: fmt => mld_c_dec_aggregator_fmt end type mld_c_dec_aggregator_type abstract interface subroutine mld_c_map_bld(iorder,theta,a,desc_a,nlaggr,ilaggr,info) import :: psb_cspmat_type, psb_desc_type, psb_spk_, psb_ipk_ implicit none integer(psb_ipk_), intent(in) :: iorder type(psb_cspmat_type), intent(in) :: a type(psb_desc_type), intent(in) :: desc_a real(psb_spk_), intent(in) :: theta integer(psb_ipk_), allocatable, intent(out) :: ilaggr(:),nlaggr(:) integer(psb_ipk_), intent(out) :: info end subroutine mld_c_map_bld end interface procedure(mld_c_map_bld) :: mld_c_vmb_map_bld, mld_c_hyb_map_bld interface subroutine mld_c_dec_aggregator_build_tprol(ag,parms,a,desc_a,ilaggr,nlaggr,op_prol,info) import :: mld_c_dec_aggregator_type, psb_desc_type, psb_cspmat_type, psb_spk_, & & psb_ipk_, psb_long_int_k_, mld_sml_parms implicit none class(mld_c_dec_aggregator_type), target, intent(inout) :: ag type(mld_sml_parms), intent(inout) :: parms 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 end subroutine mld_c_dec_aggregator_build_tprol end interface interface subroutine mld_c_dec_aggregator_mat_asb(ag,parms,a,desc_a,ilaggr,nlaggr,ac,& & op_prol,op_restr,info) import :: mld_c_dec_aggregator_type, psb_desc_type, psb_cspmat_type, psb_spk_, & & psb_ipk_, psb_long_int_k_, mld_sml_parms implicit none class(mld_c_dec_aggregator_type), target, intent(inout) :: ag type(mld_sml_parms), intent(inout) :: parms type(psb_cspmat_type), intent(in) :: a type(psb_desc_type), intent(in) :: desc_a integer(psb_ipk_), intent(inout) :: ilaggr(:), nlaggr(:) type(psb_cspmat_type), intent(inout) :: op_prol type(psb_cspmat_type), intent(out) :: ac,op_restr integer(psb_ipk_), intent(out) :: info end subroutine mld_c_dec_aggregator_mat_asb end interface contains subroutine mld_c_dec_aggregator_set_aggr_type(ag,parms,info) use mld_base_prec_type implicit none class(mld_c_dec_aggregator_type), intent(inout) :: ag type(mld_sml_parms), intent(in) :: parms integer(psb_ipk_), intent(out) :: info select case(parms%aggr_type) case (mld_noalg_) ag%map_bld => null() case (mld_vmb_) ag%map_bld => mld_c_vmb_map_bld case (mld_hyb_) ag%map_bld => mld_c_hyb_map_bld case default write(0,*) 'Unknown aggregation type, defaulting to VMB' ag%map_bld => mld_c_vmb_map_bld end select return end subroutine mld_c_dec_aggregator_set_aggr_type subroutine mld_c_dec_aggregator_default(ag) implicit none class(mld_c_dec_aggregator_type), intent(inout) :: ag ag%map_bld => mld_c_vmb_map_bld return end subroutine mld_c_dec_aggregator_default function mld_c_dec_aggregator_fmt() result(val) implicit none character(len=32) :: val val = "Decoupled aggregation" end function mld_c_dec_aggregator_fmt end module mld_c_dec_aggregator_mod