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200 lines
7.3 KiB
Fortran
200 lines
7.3 KiB
Fortran
!
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!
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! MLD2P4 version 2.2
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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 2008-2018
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!
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! Salvatore Filippone
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! Pasqua D'Ambra
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! Daniela di Serafino
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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_d_tlu_solver_mod.f90
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!
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! Module: mld_d_tlu_solver_mod
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!
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! This module serves as an example of how to define a new solver and integrate
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! it in MLD2P4 via the P%SET(sv,info) method.
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! In this example we are extending the ILU solver by implementing a new factorization algorithm.
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! In actual reality, we are just giving a new name to ILU(0), but this should be sufficient to show
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! the basics.
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!
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! The code is divided in two files:
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! 1. The interface file (this one)
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! 2. The implementation file (mld_d_tlu_solver_impl.f90)
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!
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! The separation between interface and implementation is an essential part of the
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! object-oriented design. The most appropriate tool would be to have the implementation
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! in a SUBMODULE, something which we plan to do at some point in the future but will
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! need to check for compiler support.
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!
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!
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!
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module mld_d_tlu_solver
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use mld_d_ilu_solver
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! use mld_d_ilu_fact_mod
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type, extends(mld_d_ilu_solver_type) :: mld_d_tlu_solver_type
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!
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! These are already defined in the ILU solver type; since we
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! are supposedly implementing a new factorization strategy, the
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! data components are the same, and we only need to change
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! the methods that build the solver.
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!
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!type(psb_dspmat_type) :: l, u
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!real(psb_dpk_), allocatable :: d(:)
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!type(psb_d_vect_type) :: dv
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!integer(psb_ipk_) :: fact_type, fill_in
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!real(psb_dpk_) :: thresh
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contains
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!
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! Again, we can freely reuse these methods because they would be
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! in common among all possible ILU factorizations
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!
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!
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!procedure, pass(sv) :: dump => mld_d_tlu_solver_dmp
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!procedure, pass(sv) :: ccheck => d_tlu_solver_check
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!procedure, pass(sv) :: clone => mld_d_tlu_solver_clone
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!procedure, pass(sv) :: cnv => mld_d_tlu_solver_cnv
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!procedure, pass(sv) :: apply_v => mld_d_tlu_solver_apply_vect
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!procedure, pass(sv) :: apply_a => mld_d_tlu_solver_apply
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!procedure, pass(sv) :: free => d_tlu_solver_free
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!procedure, pass(sv) :: seti => d_tlu_solver_seti
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!procedure, pass(sv) :: setc => d_tlu_solver_setc
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!procedure, pass(sv) :: setr => d_tlu_solver_setr
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!procedure, pass(sv) :: cseti => d_tlu_solver_cseti
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!procedure, pass(sv) :: csetc => d_tlu_solver_csetc
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!procedure, pass(sv) :: csetr => d_tlu_solver_csetr
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!procedure, pass(sv) :: sizeof => d_tlu_solver_sizeof
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!procedure, pass(sv) :: get_nzeros => d_tlu_solver_get_nzeros
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!procedure, nopass :: get_id => d_tlu_solver_get_id
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!
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! These methods are specific for the new solver type
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! and therefore need to be overridden
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!
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procedure, pass(sv) :: descr => d_tlu_solver_descr
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procedure, pass(sv) :: default => d_tlu_solver_default
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procedure, pass(sv) :: build => mld_d_tlu_solver_bld
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procedure, nopass :: get_fmt => d_tlu_solver_get_fmt
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end type mld_d_tlu_solver_type
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private :: d_tlu_solver_get_fmt, d_tlu_solver_descr, d_tlu_solver_default
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interface
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subroutine mld_d_tlu_solver_bld(a,desc_a,sv,info,b,amold,vmold, imold)
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import :: psb_desc_type, mld_d_tlu_solver_type, psb_d_vect_type, psb_dpk_, &
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& psb_dspmat_type, psb_d_base_sparse_mat, psb_d_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_dspmat_type), intent(in), target :: a
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Type(psb_desc_type), Intent(in) :: desc_a
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class(mld_d_tlu_solver_type), intent(inout) :: sv
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integer(psb_ipk_), intent(out) :: info
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type(psb_dspmat_type), intent(in), target, optional :: b
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class(psb_d_base_sparse_mat), intent(in), optional :: amold
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class(psb_d_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_d_tlu_solver_bld
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end interface
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contains
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!
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! This method is a copy of the ILU method, because for this example we are
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! only repackaging existing code.
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!
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subroutine d_tlu_solver_default(sv)
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Implicit None
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! Arguments
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class(mld_d_tlu_solver_type), intent(inout) :: sv
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sv%fact_type = mld_ilu_n_
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sv%fill_in = 0
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sv%thresh = dzero
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return
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end subroutine d_tlu_solver_default
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function d_tlu_solver_get_fmt() result(val)
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implicit none
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character(len=32) :: val
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val = "TLU solver"
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end function d_tlu_solver_get_fmt
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subroutine d_tlu_solver_descr(sv,info,iout,coarse)
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Implicit None
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! Arguments
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class(mld_d_tlu_solver_type), intent(in) :: sv
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integer(psb_ipk_), intent(out) :: info
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integer(psb_ipk_), intent(in), optional :: iout
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logical, intent(in), optional :: coarse
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! Local variables
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integer(psb_ipk_) :: err_act
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character(len=20), parameter :: name='mld_d_tlu_solver_descr'
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integer(psb_ipk_) :: iout_
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call psb_erractionsave(err_act)
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info = psb_success_
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if (present(iout)) then
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iout_ = iout
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else
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iout_ = psb_out_unit
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endif
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write(iout_,*) ' Incomplete factorization solver: New Factorization TLU '
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select case(sv%fact_type)
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case(mld_ilu_n_,mld_milu_n_)
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write(iout_,*) ' Fill level:',sv%fill_in
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case(mld_ilu_t_)
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write(iout_,*) ' Fill level:',sv%fill_in
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write(iout_,*) ' Fill threshold :',sv%thresh
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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_tlu_solver_descr
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end module mld_d_tlu_solver
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