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635 lines
22 KiB
Fortran
635 lines
22 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 3.4)
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!!$
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!!$ (C) Copyright 2008, 2010, 2012, 2015, 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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!!$ Alfredo Buttari CNRS-IRIT, Toulouse
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!!$ Pasqua D'Ambra ICAR-CNR, Naples
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!!$ Daniela di Serafino Second University of Naples
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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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! File: mld_c_gs_solver_mod.f90
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!
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! Module: mld_c_gs_solver_mod
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!
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! This module defines:
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! - the mld_c_gs_solver_type data structure containing the ingredients
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! for a local Gauss-Seidel iteration. We provide Forward GS (FWGS) and
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! backward GS (BWGS). The iterations are local to a process (they operate
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! on the block diagonal). Combined with a Jacobi smoother will generate a
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! hybrid-Gauss-Seidel solver, i.e. Gauss-Seidel within each process, Jacobi
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! among the processes.
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!
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!
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module mld_c_gs_solver
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use mld_c_base_solver_mod
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type, extends(mld_c_base_solver_type) :: mld_c_gs_solver_type
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type(psb_cspmat_type) :: l, u
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integer(psb_ipk_) :: sweeps
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real(psb_spk_) :: eps
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contains
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procedure, pass(sv) :: dump => mld_c_gs_solver_dmp
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procedure, pass(sv) :: ccheck => d_gs_solver_check
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procedure, pass(sv) :: clone => mld_c_gs_solver_clone
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procedure, pass(sv) :: build => mld_c_gs_solver_bld
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procedure, pass(sv) :: cnv => mld_c_gs_solver_cnv
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procedure, pass(sv) :: apply_v => mld_c_gs_solver_apply_vect
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procedure, pass(sv) :: apply_a => mld_c_gs_solver_apply
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procedure, pass(sv) :: free => d_gs_solver_free
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procedure, pass(sv) :: seti => d_gs_solver_seti
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procedure, pass(sv) :: setc => d_gs_solver_setc
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procedure, pass(sv) :: setr => d_gs_solver_setr
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procedure, pass(sv) :: cseti => d_gs_solver_cseti
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procedure, pass(sv) :: csetc => d_gs_solver_csetc
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procedure, pass(sv) :: csetr => d_gs_solver_csetr
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procedure, pass(sv) :: descr => d_gs_solver_descr
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procedure, pass(sv) :: default => d_gs_solver_default
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procedure, pass(sv) :: sizeof => d_gs_solver_sizeof
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procedure, pass(sv) :: get_nzeros => d_gs_solver_get_nzeros
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procedure, nopass :: get_fmt => d_gs_solver_get_fmt
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procedure, nopass :: is_iterative => d_gs_solver_is_iterative
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end type mld_c_gs_solver_type
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type, extends(mld_c_gs_solver_type) :: mld_c_bwgs_solver_type
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contains
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procedure, pass(sv) :: build => mld_c_bwgs_solver_bld
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procedure, pass(sv) :: apply_v => mld_c_bwgs_solver_apply_vect
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procedure, pass(sv) :: apply_a => mld_c_bwgs_solver_apply
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procedure, nopass :: get_fmt => c_bwgs_solver_get_fmt
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procedure, pass(sv) :: descr => c_bwgs_solver_descr
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end type mld_c_bwgs_solver_type
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private :: c_gs_solver_bld, c_gs_solver_apply, &
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& c_gs_solver_free, c_gs_solver_seti, &
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& c_gs_solver_setc, c_gs_solver_setr,&
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& c_gs_solver_descr, c_gs_solver_sizeof, &
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& c_gs_solver_default, c_gs_solver_dmp, &
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& c_gs_solver_apply_vect, c_gs_solver_get_nzeros, &
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& c_gs_solver_get_fmt, c_gs_solver_check,&
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& c_gs_solver_is_iterative, &
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& c_bwgs_solver_get_fmt, c_bwgs_solver_descr
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interface
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subroutine mld_c_gs_solver_apply_vect(alpha,sv,x,beta,y,desc_data,&
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& trans,work,info,init,initu)
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import :: psb_desc_type, mld_c_gs_solver_type, psb_c_vect_type, psb_spk_, &
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& psb_cspmat_type, psb_c_base_sparse_mat, psb_c_base_vect_type, psb_ipk_
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implicit none
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type(psb_desc_type), intent(in) :: desc_data
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class(mld_c_gs_solver_type), intent(inout) :: sv
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type(psb_c_vect_type),intent(inout) :: x
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type(psb_c_vect_type),intent(inout) :: y
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complex(psb_spk_),intent(in) :: alpha,beta
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character(len=1),intent(in) :: trans
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complex(psb_spk_),target, intent(inout) :: work(:)
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integer(psb_ipk_), intent(out) :: info
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character, intent(in), optional :: init
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type(psb_c_vect_type),intent(inout), optional :: initu
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end subroutine mld_c_gs_solver_apply_vect
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subroutine mld_c_bwgs_solver_apply_vect(alpha,sv,x,beta,y,desc_data,&
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& trans,work,info,init,initu)
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import :: psb_desc_type, mld_c_bwgs_solver_type, psb_c_vect_type, psb_spk_, &
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& psb_cspmat_type, psb_c_base_sparse_mat, psb_c_base_vect_type, psb_ipk_
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implicit none
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type(psb_desc_type), intent(in) :: desc_data
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class(mld_c_bwgs_solver_type), intent(inout) :: sv
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type(psb_c_vect_type),intent(inout) :: x
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type(psb_c_vect_type),intent(inout) :: y
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complex(psb_spk_),intent(in) :: alpha,beta
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character(len=1),intent(in) :: trans
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complex(psb_spk_),target, intent(inout) :: work(:)
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integer(psb_ipk_), intent(out) :: info
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character, intent(in), optional :: init
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type(psb_c_vect_type),intent(inout), optional :: initu
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end subroutine mld_c_bwgs_solver_apply_vect
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end interface
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interface
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subroutine mld_c_gs_solver_apply(alpha,sv,x,beta,y,desc_data,trans,work,info,init,initu)
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import :: psb_desc_type, mld_c_gs_solver_type, psb_c_vect_type, psb_spk_, &
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& psb_cspmat_type, psb_c_base_sparse_mat, psb_c_base_vect_type, psb_ipk_
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implicit none
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type(psb_desc_type), intent(in) :: desc_data
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class(mld_c_gs_solver_type), intent(inout) :: sv
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complex(psb_spk_),intent(inout) :: x(:)
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complex(psb_spk_),intent(inout) :: y(:)
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complex(psb_spk_),intent(in) :: alpha,beta
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character(len=1),intent(in) :: trans
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complex(psb_spk_),target, intent(inout) :: work(:)
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integer(psb_ipk_), intent(out) :: info
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character, intent(in), optional :: init
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complex(psb_spk_),intent(inout), optional :: initu(:)
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end subroutine mld_c_gs_solver_apply
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subroutine mld_c_bwgs_solver_apply(alpha,sv,x,beta,y,desc_data,&
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& trans,work,info,init,initu)
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import :: psb_desc_type, mld_c_bwgs_solver_type, psb_c_vect_type, psb_spk_, &
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& psb_cspmat_type, psb_c_base_sparse_mat, psb_c_base_vect_type, psb_ipk_
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implicit none
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type(psb_desc_type), intent(in) :: desc_data
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class(mld_c_bwgs_solver_type), intent(inout) :: sv
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complex(psb_spk_),intent(inout) :: x(:)
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complex(psb_spk_),intent(inout) :: y(:)
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complex(psb_spk_),intent(in) :: alpha,beta
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character(len=1),intent(in) :: trans
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complex(psb_spk_),target, intent(inout) :: work(:)
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integer(psb_ipk_), intent(out) :: info
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character, intent(in), optional :: init
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complex(psb_spk_),intent(inout), optional :: initu(:)
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end subroutine mld_c_bwgs_solver_apply
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end interface
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interface
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subroutine mld_c_gs_solver_bld(a,desc_a,sv,upd,info,b,amold,vmold,imold)
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import :: psb_desc_type, mld_c_gs_solver_type, psb_c_vect_type, psb_spk_, &
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& psb_cspmat_type, psb_c_base_sparse_mat, psb_c_base_vect_type,&
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& psb_ipk_, psb_i_base_vect_type
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implicit none
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type(psb_cspmat_type), intent(in), target :: a
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Type(psb_desc_type), Intent(in) :: desc_a
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class(mld_c_gs_solver_type), intent(inout) :: sv
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character, intent(in) :: upd
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integer(psb_ipk_), intent(out) :: info
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type(psb_cspmat_type), intent(in), target, optional :: b
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class(psb_c_base_sparse_mat), intent(in), optional :: amold
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class(psb_c_base_vect_type), intent(in), optional :: vmold
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class(psb_i_base_vect_type), intent(in), optional :: imold
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end subroutine mld_c_gs_solver_bld
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subroutine mld_c_bwgs_solver_bld(a,desc_a,sv,upd,info,b,amold,vmold,imold)
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import :: psb_desc_type, mld_c_bwgs_solver_type, psb_c_vect_type, psb_spk_, &
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& psb_cspmat_type, psb_c_base_sparse_mat, psb_c_base_vect_type,&
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& psb_ipk_, psb_i_base_vect_type
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implicit none
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type(psb_cspmat_type), intent(in), target :: a
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Type(psb_desc_type), Intent(in) :: desc_a
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class(mld_c_bwgs_solver_type), intent(inout) :: sv
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character, intent(in) :: upd
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integer(psb_ipk_), intent(out) :: info
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type(psb_cspmat_type), intent(in), target, optional :: b
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class(psb_c_base_sparse_mat), intent(in), optional :: amold
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class(psb_c_base_vect_type), intent(in), optional :: vmold
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class(psb_i_base_vect_type), intent(in), optional :: imold
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end subroutine mld_c_bwgs_solver_bld
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end interface
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interface
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subroutine mld_c_gs_solver_cnv(sv,info,amold,vmold,imold)
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import :: mld_c_gs_solver_type, psb_spk_, &
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& psb_c_base_sparse_mat, psb_c_base_vect_type,&
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& psb_ipk_, psb_i_base_vect_type
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implicit none
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class(mld_c_gs_solver_type), intent(inout) :: sv
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integer(psb_ipk_), intent(out) :: info
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class(psb_c_base_sparse_mat), intent(in), optional :: amold
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class(psb_c_base_vect_type), intent(in), optional :: vmold
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class(psb_i_base_vect_type), intent(in), optional :: imold
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end subroutine mld_c_gs_solver_cnv
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end interface
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interface
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subroutine mld_c_gs_solver_dmp(sv,ictxt,level,info,prefix,head,solver)
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import :: psb_desc_type, mld_c_gs_solver_type, psb_c_vect_type, psb_spk_, &
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& psb_cspmat_type, psb_c_base_sparse_mat, psb_c_base_vect_type, &
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& psb_ipk_
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implicit none
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class(mld_c_gs_solver_type), intent(in) :: sv
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integer(psb_ipk_), intent(in) :: ictxt
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integer(psb_ipk_), intent(in) :: level
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integer(psb_ipk_), intent(out) :: info
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character(len=*), intent(in), optional :: prefix, head
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logical, optional, intent(in) :: solver
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end subroutine mld_c_gs_solver_dmp
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end interface
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interface
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subroutine mld_c_gs_solver_clone(sv,svout,info)
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import :: psb_desc_type, psb_cspmat_type, psb_c_base_sparse_mat, &
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& psb_c_vect_type, psb_c_base_vect_type, psb_spk_, &
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& mld_c_base_solver_type, mld_c_gs_solver_type, psb_ipk_
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Implicit None
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! Arguments
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class(mld_c_gs_solver_type), intent(inout) :: sv
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class(mld_c_base_solver_type), allocatable, intent(inout) :: svout
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integer(psb_ipk_), intent(out) :: info
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end subroutine mld_c_gs_solver_clone
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end interface
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contains
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subroutine d_gs_solver_default(sv)
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Implicit None
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! Arguments
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class(mld_c_gs_solver_type), intent(inout) :: sv
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sv%sweeps = ione
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sv%eps = dzero
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return
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end subroutine d_gs_solver_default
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subroutine d_gs_solver_check(sv,info)
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Implicit None
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! Arguments
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class(mld_c_gs_solver_type), intent(inout) :: sv
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integer(psb_ipk_), intent(out) :: info
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integer(psb_ipk_) :: err_act
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character(len=20) :: name='d_gs_solver_check'
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call psb_erractionsave(err_act)
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info = psb_success_
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call mld_check_def(sv%sweeps,&
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& 'GS Sweeps',ione,is_int_positive)
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if (info /= psb_success_) goto 9999
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call psb_erractionrestore(err_act)
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return
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9999 call psb_error_handler(err_act)
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return
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end subroutine d_gs_solver_check
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subroutine d_gs_solver_seti(sv,what,val,info)
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Implicit None
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! Arguments
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class(mld_c_gs_solver_type), intent(inout) :: sv
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integer(psb_ipk_), intent(in) :: what
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integer(psb_ipk_), intent(in) :: val
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integer(psb_ipk_), intent(out) :: info
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integer(psb_ipk_) :: err_act
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character(len=20) :: name='d_gs_solver_seti'
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info = psb_success_
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call psb_erractionsave(err_act)
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select case(what)
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case(mld_solver_sweeps_)
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sv%sweeps = val
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case default
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call sv%mld_c_base_solver_type%set(what,val,info)
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end select
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call psb_erractionrestore(err_act)
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return
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9999 call psb_error_handler(err_act)
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return
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end subroutine d_gs_solver_seti
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subroutine d_gs_solver_setc(sv,what,val,info)
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Implicit None
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! Arguments
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class(mld_c_gs_solver_type), intent(inout) :: sv
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integer(psb_ipk_), intent(in) :: what
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character(len=*), intent(in) :: val
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integer(psb_ipk_), intent(out) :: info
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integer(psb_ipk_) :: err_act, ival
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character(len=20) :: name='d_gs_solver_setc'
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info = psb_success_
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call psb_erractionsave(err_act)
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ival = sv%stringval(val)
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if (ival >= 0) then
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call sv%set(what,ival,info)
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end if
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if (info /= psb_success_) then
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info = psb_err_from_subroutine_
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call psb_errpush(info, name)
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goto 9999
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end if
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call psb_erractionrestore(err_act)
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return
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9999 call psb_error_handler(err_act)
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return
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end subroutine d_gs_solver_setc
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subroutine d_gs_solver_setr(sv,what,val,info)
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Implicit None
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! Arguments
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class(mld_c_gs_solver_type), intent(inout) :: sv
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integer(psb_ipk_), intent(in) :: what
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real(psb_spk_), intent(in) :: val
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integer(psb_ipk_), intent(out) :: info
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integer(psb_ipk_) :: err_act
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character(len=20) :: name='d_gs_solver_setr'
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call psb_erractionsave(err_act)
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info = psb_success_
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select case(what)
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case(mld_solver_eps_)
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sv%eps = val
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case default
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call sv%mld_c_base_solver_type%set(what,val,info)
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end select
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call psb_erractionrestore(err_act)
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return
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9999 call psb_error_handler(err_act)
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return
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end subroutine d_gs_solver_setr
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subroutine d_gs_solver_cseti(sv,what,val,info)
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Implicit None
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! Arguments
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class(mld_c_gs_solver_type), intent(inout) :: sv
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character(len=*), intent(in) :: what
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integer(psb_ipk_), intent(in) :: val
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integer(psb_ipk_), intent(out) :: info
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integer(psb_ipk_) :: err_act
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character(len=20) :: name='d_gs_solver_cseti'
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|
|
|
info = psb_success_
|
|
call psb_erractionsave(err_act)
|
|
|
|
select case(psb_toupper(what))
|
|
case('SOLVER_SWEEPS')
|
|
sv%sweeps = val
|
|
case default
|
|
call sv%mld_c_base_solver_type%set(what,val,info)
|
|
end select
|
|
|
|
call psb_erractionrestore(err_act)
|
|
return
|
|
|
|
9999 call psb_error_handler(err_act)
|
|
return
|
|
end subroutine d_gs_solver_cseti
|
|
|
|
subroutine d_gs_solver_csetc(sv,what,val,info)
|
|
|
|
Implicit None
|
|
|
|
! Arguments
|
|
class(mld_c_gs_solver_type), intent(inout) :: sv
|
|
character(len=*), intent(in) :: what
|
|
character(len=*), intent(in) :: val
|
|
integer(psb_ipk_), intent(out) :: info
|
|
integer(psb_ipk_) :: err_act, ival
|
|
character(len=20) :: name='d_gs_solver_csetc'
|
|
|
|
info = psb_success_
|
|
call psb_erractionsave(err_act)
|
|
|
|
|
|
ival = sv%stringval(val)
|
|
if (ival >= 0) then
|
|
call sv%set(what,ival,info)
|
|
end if
|
|
|
|
if (info /= psb_success_) then
|
|
info = psb_err_from_subroutine_
|
|
call psb_errpush(info, name)
|
|
goto 9999
|
|
end if
|
|
|
|
call psb_erractionrestore(err_act)
|
|
return
|
|
|
|
9999 call psb_error_handler(err_act)
|
|
return
|
|
end subroutine d_gs_solver_csetc
|
|
|
|
subroutine d_gs_solver_csetr(sv,what,val,info)
|
|
|
|
Implicit None
|
|
|
|
! Arguments
|
|
class(mld_c_gs_solver_type), intent(inout) :: sv
|
|
character(len=*), intent(in) :: what
|
|
real(psb_spk_), intent(in) :: val
|
|
integer(psb_ipk_), intent(out) :: info
|
|
integer(psb_ipk_) :: err_act
|
|
character(len=20) :: name='d_gs_solver_csetr'
|
|
|
|
call psb_erractionsave(err_act)
|
|
info = psb_success_
|
|
|
|
select case(psb_toupper(what))
|
|
case('SOLVER_EPS')
|
|
sv%eps = val
|
|
case default
|
|
call sv%mld_c_base_solver_type%set(what,val,info)
|
|
end select
|
|
|
|
|
|
call psb_erractionrestore(err_act)
|
|
return
|
|
|
|
9999 call psb_error_handler(err_act)
|
|
return
|
|
end subroutine d_gs_solver_csetr
|
|
|
|
subroutine d_gs_solver_free(sv,info)
|
|
|
|
Implicit None
|
|
|
|
! Arguments
|
|
class(mld_c_gs_solver_type), intent(inout) :: sv
|
|
integer(psb_ipk_), intent(out) :: info
|
|
integer(psb_ipk_) :: err_act
|
|
character(len=20) :: name='d_gs_solver_free'
|
|
|
|
call psb_erractionsave(err_act)
|
|
info = psb_success_
|
|
|
|
call sv%l%free()
|
|
call sv%u%free()
|
|
|
|
call psb_erractionrestore(err_act)
|
|
return
|
|
|
|
9999 call psb_error_handler(err_act)
|
|
return
|
|
end subroutine d_gs_solver_free
|
|
|
|
subroutine d_gs_solver_descr(sv,info,iout,coarse)
|
|
|
|
Implicit None
|
|
|
|
! Arguments
|
|
class(mld_c_gs_solver_type), intent(in) :: sv
|
|
integer(psb_ipk_), intent(out) :: info
|
|
integer(psb_ipk_), intent(in), optional :: iout
|
|
logical, intent(in), optional :: coarse
|
|
|
|
! Local variables
|
|
integer(psb_ipk_) :: err_act
|
|
character(len=20), parameter :: name='mld_c_gs_solver_descr'
|
|
integer(psb_ipk_) :: iout_
|
|
|
|
call psb_erractionsave(err_act)
|
|
info = psb_success_
|
|
if (present(iout)) then
|
|
iout_ = iout
|
|
else
|
|
iout_ = 6
|
|
endif
|
|
|
|
if (sv%eps<=dzero) then
|
|
write(iout_,*) ' Forward Gauss-Seidel iterative solver with ',&
|
|
& sv%sweeps,' sweeps'
|
|
else
|
|
write(iout_,*) ' Forward Gauss-Seidel iterative solver with tolerance',&
|
|
& sv%eps,' and maxit', sv%sweeps
|
|
end if
|
|
|
|
call psb_erractionrestore(err_act)
|
|
return
|
|
|
|
9999 call psb_error_handler(err_act)
|
|
return
|
|
end subroutine d_gs_solver_descr
|
|
|
|
function d_gs_solver_get_nzeros(sv) result(val)
|
|
|
|
implicit none
|
|
! Arguments
|
|
class(mld_c_gs_solver_type), intent(in) :: sv
|
|
integer(psb_long_int_k_) :: val
|
|
integer(psb_ipk_) :: i
|
|
|
|
val = 0
|
|
val = val + sv%l%get_nzeros()
|
|
val = val + sv%u%get_nzeros()
|
|
|
|
return
|
|
end function d_gs_solver_get_nzeros
|
|
|
|
function d_gs_solver_sizeof(sv) result(val)
|
|
|
|
implicit none
|
|
! Arguments
|
|
class(mld_c_gs_solver_type), intent(in) :: sv
|
|
integer(psb_long_int_k_) :: val
|
|
integer(psb_ipk_) :: i
|
|
|
|
val = psb_sizeof_int
|
|
val = val + sv%l%sizeof()
|
|
val = val + sv%u%sizeof()
|
|
|
|
return
|
|
end function d_gs_solver_sizeof
|
|
|
|
function d_gs_solver_get_fmt() result(val)
|
|
implicit none
|
|
character(len=32) :: val
|
|
|
|
val = "Forward Gauss-Seidel solver"
|
|
end function d_gs_solver_get_fmt
|
|
|
|
|
|
!
|
|
! If this is true, then the solver needs a starting
|
|
! guess. Currently only handled in JAC smoother.
|
|
!
|
|
function d_gs_solver_is_iterative() result(val)
|
|
implicit none
|
|
logical :: val
|
|
|
|
val = .true.
|
|
end function d_gs_solver_is_iterative
|
|
|
|
subroutine c_bwgs_solver_descr(sv,info,iout,coarse)
|
|
|
|
Implicit None
|
|
|
|
! Arguments
|
|
class(mld_c_bwgs_solver_type), intent(in) :: sv
|
|
integer(psb_ipk_), intent(out) :: info
|
|
integer(psb_ipk_), intent(in), optional :: iout
|
|
logical, intent(in), optional :: coarse
|
|
|
|
! Local variables
|
|
integer(psb_ipk_) :: err_act
|
|
character(len=20), parameter :: name='mld_c_bwgs_solver_descr'
|
|
integer(psb_ipk_) :: iout_
|
|
|
|
call psb_erractionsave(err_act)
|
|
info = psb_success_
|
|
if (present(iout)) then
|
|
iout_ = iout
|
|
else
|
|
iout_ = 6
|
|
endif
|
|
|
|
if (sv%eps<=dzero) then
|
|
write(iout_,*) ' Backward Gauss-Seidel iterative solver with ',&
|
|
& sv%sweeps,' sweeps'
|
|
else
|
|
write(iout_,*) ' Backward Gauss-Seidel iterative solver with tolerance',&
|
|
& sv%eps,' and maxit', sv%sweeps
|
|
end if
|
|
|
|
call psb_erractionrestore(err_act)
|
|
return
|
|
|
|
9999 call psb_error_handler(err_act)
|
|
return
|
|
end subroutine c_bwgs_solver_descr
|
|
|
|
function c_bwgs_solver_get_fmt() result(val)
|
|
implicit none
|
|
character(len=32) :: val
|
|
|
|
val = "Backward Gauss-Seidel solver"
|
|
end function c_bwgs_solver_get_fmt
|
|
|
|
end module mld_c_gs_solver
|