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494 lines
15 KiB
Fortran
494 lines
15 KiB
Fortran
!
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!
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! AMG4PSBLAS version 1.0
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! Algebraic Multigrid Package
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! based on PSBLAS (Parallel Sparse BLAS version 3.7)
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!
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! (C) Copyright 2021
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!
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! Salvatore Filippone
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! Pasqua D'Ambra
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! Fabio Durastante
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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 AMG4PSBLAS 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 AMG4PSBLAS 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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! File: amg_d_sludist_solver_mod.f90
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!
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! Module: amg_d_sludist_solver_mod
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!
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! This module defines:
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! - the amg_d_sludist_solver_type data structure containing the ingredients
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! to interface with the SuperLU_Dist package.
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! 1. The factorization is distributed (and thus exact)
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!
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!
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!
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module amg_d_sludist_solver
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use iso_c_binding
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use amg_d_base_solver_mod
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#if (!defined(HAVE_SLUDIST_)) || defined(IPK8)
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type, extends(amg_d_base_solver_type) :: amg_d_sludist_solver_type
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end type amg_d_sludist_solver_type
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#else
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type, extends(amg_d_base_solver_type) :: amg_d_sludist_solver_type
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type(c_ptr) :: lufactors=c_null_ptr
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integer(c_long_long) :: symbsize=0, numsize=0
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contains
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procedure, pass(sv) :: build => d_sludist_solver_bld
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procedure, pass(sv) :: apply_a => d_sludist_solver_apply
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procedure, pass(sv) :: apply_v => d_sludist_solver_apply_vect
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procedure, pass(sv) :: free => d_sludist_solver_free
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procedure, pass(sv) :: clear_data => d_sludist_solver_clear_data
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procedure, pass(sv) :: descr => d_sludist_solver_descr
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procedure, pass(sv) :: sizeof => d_sludist_solver_sizeof
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procedure, nopass :: get_fmt => d_sludist_solver_get_fmt
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procedure, nopass :: get_id => d_sludist_solver_get_id
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procedure, pass(sv) :: is_global => d_sludist_solver_is_global
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final :: d_sludist_solver_finalize
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end type amg_d_sludist_solver_type
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private :: d_sludist_solver_bld, d_sludist_solver_apply, &
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& d_sludist_solver_free, d_sludist_solver_descr, &
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& d_sludist_solver_sizeof, d_sludist_solver_apply_vect, &
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& d_sludist_solver_get_fmt, d_sludist_solver_get_id, &
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& d_sludist_solver_is_global, d_sludist_solver_clear_data
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private :: d_sludist_solver_finalize
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interface
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function amg_dsludist_fact(n,nl,nnz,ifrst, &
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& values,rowptr,colind,lufactors,npr,npc) &
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& bind(c,name='amg_dsludist_fact') result(info)
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use iso_c_binding
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integer(c_int), value :: n,nl,nnz,ifrst,npr,npc
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integer(c_int) :: info
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integer(c_int) :: rowptr(*),colind(*)
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real(c_double) :: values(*)
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type(c_ptr) :: lufactors
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end function amg_dsludist_fact
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end interface
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interface
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function amg_dsludist_solve(itrans,n,nrhs, b, ldb, lufactors)&
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& bind(c,name='amg_dsludist_solve') result(info)
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use iso_c_binding
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integer(c_int) :: info
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integer(c_int), value :: itrans,n,nrhs,ldb
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real(c_double) :: b(ldb,*)
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type(c_ptr), value :: lufactors
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end function amg_dsludist_solve
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end interface
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interface
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function amg_dsludist_free(lufactors)&
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& bind(c,name='amg_dsludist_free') result(info)
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use iso_c_binding
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integer(c_int) :: info
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type(c_ptr), value :: lufactors
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end function amg_dsludist_free
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end interface
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contains
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subroutine d_sludist_solver_apply(alpha,sv,x,beta,y,desc_data,&
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& trans,work,info,init,initu)
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use psb_base_mod
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implicit none
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type(psb_desc_type), intent(in) :: desc_data
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class(amg_d_sludist_solver_type), intent(inout) :: sv
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real(psb_dpk_),intent(inout) :: x(:)
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real(psb_dpk_),intent(inout) :: y(:)
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real(psb_dpk_),intent(in) :: alpha,beta
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character(len=1),intent(in) :: trans
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real(psb_dpk_),target, intent(inout) :: work(:)
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integer, intent(out) :: info
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character, intent(in), optional :: init
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real(psb_dpk_),intent(inout), optional :: initu(:)
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integer :: n_row,n_col
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real(psb_dpk_), pointer :: ww(:)
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type(psb_ctxt_type) :: ctxt
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integer :: np,me,i, err_act
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character :: trans_
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character(len=20) :: name='d_sludist_solver_apply'
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call psb_erractionsave(err_act)
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info = psb_success_
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trans_ = psb_toupper(trans)
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select case(trans_)
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case('N')
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case('T','C')
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case default
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call psb_errpush(psb_err_iarg_invalid_i_,name)
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goto 9999
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end select
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!
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! For non-iterative solvers, init and initu are ignored.
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!
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n_row = desc_data%get_local_rows()
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n_col = desc_data%get_local_cols()
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if (n_col <= size(work)) then
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ww => work(1:n_col)
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else
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allocate(ww(n_col),stat=info)
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if (info /= psb_success_) then
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info=psb_err_alloc_request_
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call psb_errpush(info,name,i_err=(/n_col/),&
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& a_err='real(psb_dpk_)')
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goto 9999
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end if
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endif
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if (info == psb_success_)&
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& call psb_geaxpby(done,x,dzero,ww,desc_data,info)
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select case(trans_)
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case('N')
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info = amg_dsludist_solve(0,n_row,1,ww,n_row,sv%lufactors)
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case('T')
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info = amg_dsludist_solve(1,n_row,1,ww,n_row,sv%lufactors)
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case('C')
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info = amg_dsludist_solve(2,n_row,1,ww,n_row,sv%lufactors)
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case default
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call psb_errpush(psb_err_internal_error_,&
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& name,a_err='Invalid TRANS in subsolve')
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goto 9999
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end select
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if (info == psb_success_)&
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& call psb_geaxpby(alpha,ww,beta,y,desc_data,info)
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if (info /= psb_success_) then
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call psb_errpush(psb_err_internal_error_,&
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& name,a_err='Error in subsolve')
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goto 9999
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endif
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if (n_col > size(work)) then
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deallocate(ww)
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endif
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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_sludist_solver_apply
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subroutine d_sludist_solver_apply_vect(alpha,sv,x,beta,y,desc_data,&
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& trans,work,wv,info,init,initu)
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use psb_base_mod
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implicit none
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type(psb_desc_type), intent(in) :: desc_data
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class(amg_d_sludist_solver_type), intent(inout) :: sv
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type(psb_d_vect_type),intent(inout) :: x
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type(psb_d_vect_type),intent(inout) :: y
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real(psb_dpk_),intent(in) :: alpha,beta
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character(len=1),intent(in) :: trans
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real(psb_dpk_),target, intent(inout) :: work(:)
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type(psb_d_vect_type),intent(inout) :: wv(:)
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integer, intent(out) :: info
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character, intent(in), optional :: init
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type(psb_d_vect_type),intent(inout), optional :: initu
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integer :: err_act
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character(len=20) :: name='d_sludist_solver_apply_vect'
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call psb_erractionsave(err_act)
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info = psb_success_
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!
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! For non-iterative solvers, init and initu are ignored.
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!
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call x%v%sync()
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call y%v%sync()
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call sv%apply(alpha,x%v%v,beta,y%v%v,desc_data,trans,work,info)
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call y%v%set_host()
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if (info /= 0) 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_sludist_solver_apply_vect
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subroutine d_sludist_solver_bld(a,desc_a,sv,info,b,amold,vmold,imold)
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use psb_base_mod
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Implicit None
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! Arguments
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type(psb_dspmat_type), intent(in), target :: a
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Type(psb_desc_type), Intent(inout) :: desc_a
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class(amg_d_sludist_solver_type), intent(inout) :: sv
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integer, 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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! Local variables
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type(psb_dspmat_type) :: atmp
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type(psb_d_csr_sparse_mat) :: acsr
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type(psb_ctxt_type) :: ctxt
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integer(psb_lpk_), allocatable :: gia(:), gja(:)
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integer(psb_lpk_) :: lfrst
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integer(psb_ipk_) :: n_row,n_col, nrow_a, nztota, nglob, nzt, npr, npc
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integer(psb_ipk_) :: ifrst, ibcheck
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integer(psb_ipk_) :: np,me,i, err_act, debug_unit, debug_level
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character(len=20) :: name='d_sludist_solver_bld', ch_err
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info=psb_success_
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call psb_erractionsave(err_act)
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debug_unit = psb_get_debug_unit()
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debug_level = psb_get_debug_level()
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ctxt = desc_a%get_context()
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call psb_info(ctxt, me, np)
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npr = np
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npc = 1
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if (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),' start'
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n_row = desc_a%get_local_rows()
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n_col = desc_a%get_local_cols()
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nglob = desc_a%get_global_rows()
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!
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! Strategy here is as follows: because a call to SLUDIST
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! as a gobal solver is mostly done at the coarsest level,
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! even if we start from a problem requiring 8 bytes, chances
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! are that the global size will be suitable for 4 bytes
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! anyway, so we hope for the best, and throw an error
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! if something goes wrong.
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!
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if (nglob > huge(1_psb_ipk_)) then
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write(0,*) me,' ',trim(name),': Error: overflow of local indices '
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info=psb_err_internal_error_
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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 a%cscnv(atmp,info,type='csr')
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! This in case we are dealing with AS
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call psb_rwextd(n_row,atmp,info,b=b)
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call atmp%mv_to(acsr)
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nrow_a = acsr%get_nrows()
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nztota = acsr%get_nzeros()
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call psb_loc_to_glob(ione,lfrst,desc_a,info)
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! Fix the entries to call C-base SuperLU
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call psb_realloc(nztota,gja,info)
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call psb_loc_to_glob(acsr%ja(1:nztota),gja(1:nztota), desc_a, info, iact='I')
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acsr%ja(1:nztota) = gja(1:nztota)
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acsr%ja(:) = acsr%ja(:) - 1
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acsr%irp(:) = acsr%irp(:) - 1
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ifrst = lfrst - 1
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info = amg_dsludist_fact(nglob,nrow_a,nztota,ifrst,&
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& acsr%val,acsr%irp,acsr%ja,sv%lufactors,&
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& npr,npc)
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if (info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='amg_dsludist_fact'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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call acsr%free()
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if (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),' end'
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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_sludist_solver_bld
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subroutine d_sludist_solver_free(sv,info)
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Implicit None
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! Arguments
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class(amg_d_sludist_solver_type), intent(inout) :: sv
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integer, intent(out) :: info
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Integer :: err_act
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character(len=20) :: name='d_sludist_solver_free'
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call psb_erractionsave(err_act)
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info = 0
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call sv%clear_data(info)
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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_sludist_solver_free
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subroutine d_sludist_solver_clear_data(sv,info)
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Implicit None
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! Arguments
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class(amg_d_sludist_solver_type), intent(inout) :: sv
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integer, intent(out) :: info
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Integer :: err_act
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character(len=20) :: name='d_sludist_solver_clear_data'
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call psb_erractionsave(err_act)
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info = psb_success_
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if (c_associated(sv%lufactors)) info = amg_dsludist_free(sv%lufactors)
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sv%lufactors = c_null_ptr
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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_sludist_solver_clear_data
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!
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function d_sludist_solver_is_global(sv) result(val)
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implicit none
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class(amg_d_sludist_solver_type), intent(in) :: sv
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logical :: val
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val = .true.
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end function d_sludist_solver_is_global
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subroutine d_sludist_solver_finalize(sv)
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Implicit None
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! Arguments
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type(amg_d_sludist_solver_type), intent(inout) :: sv
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integer :: info
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Integer :: err_act
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character(len=20) :: name='d_sludist_solver_finalize'
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call sv%free(info)
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return
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end subroutine d_sludist_solver_finalize
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subroutine d_sludist_solver_descr(sv,info,iout,coarse,prefix)
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Implicit None
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! Arguments
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class(amg_d_sludist_solver_type), intent(in) :: sv
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integer, intent(out) :: info
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integer, intent(in), optional :: iout
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logical, intent(in), optional :: coarse
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character(len=*), intent(in), optional :: prefix
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! Local variables
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integer :: err_act
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type(psb_ctxt_type) :: ctxt
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integer :: me, np
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character(len=20), parameter :: name='amg_d_sludist_solver_descr'
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integer :: iout_
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character(1024) :: prefix_
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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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if (present(prefix)) then
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prefix_ = prefix
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else
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prefix_ = ""
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end if
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write(iout_,*) trim(prefix_), ' SuperLU_Dist Sparse Factorization Solver. '
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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_sludist_solver_descr
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function d_sludist_solver_sizeof(sv) result(val)
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implicit none
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! Arguments
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class(amg_d_sludist_solver_type), intent(in) :: sv
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integer(psb_epk_) :: val
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integer :: i
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val = 2*psb_sizeof_ip + psb_sizeof_dp
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val = val + sv%symbsize
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val = val + sv%numsize
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return
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end function d_sludist_solver_sizeof
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function d_sludist_solver_get_fmt() result(val)
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implicit none
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character(len=32) :: val
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val = "SuperLU_Dist solver"
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end function d_sludist_solver_get_fmt
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function d_sludist_solver_get_id() result(val)
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implicit none
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integer(psb_ipk_) :: val
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val = amg_sludist_
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end function d_sludist_solver_get_id
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#endif
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end module amg_d_sludist_solver
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