You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
216 lines
9.4 KiB
Fortran
216 lines
9.4 KiB
Fortran
!!$
|
|
!!$ Parallel Sparse BLAS version 3.4
|
|
!!$ (C) Copyright 2006, 2010, 2015
|
|
!!$ Salvatore Filippone University of Rome Tor Vergata
|
|
!!$ Alfredo Buttari CNRS-IRIT, Toulouse
|
|
!!$
|
|
!!$ 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 PSBLAS 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 PSBLAS 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.
|
|
!!$
|
|
!!$
|
|
!
|
|
! File: psb_krylov_mod.f90
|
|
! Interfaces for Krylov subspace iterative methods.
|
|
!
|
|
!
|
|
! Subroutine: psb_skrylov
|
|
!
|
|
! Front-end for the Krylov subspace iterations, realversion
|
|
!
|
|
! Arguments:
|
|
!
|
|
! methd - character The specific method; can take the values:
|
|
! CG
|
|
! CGS
|
|
! BICG
|
|
! BICGSTAB
|
|
! BICGSTABL
|
|
! RGMRES
|
|
!
|
|
! a - type(psb_sspmat_type) Input: sparse matrix containing A.
|
|
! prec - class(psb_sprec_type) Input: preconditioner
|
|
! b - real,dimension(:) Input: vector containing the
|
|
! right hand side B
|
|
! x - real,dimension(:) Input/Output: vector containing the
|
|
! initial guess and final solution X.
|
|
! eps - real Input: Stopping tolerance; the iteration is
|
|
! stopped when the error
|
|
! estimate |err| <= eps
|
|
!
|
|
! desc_a - type(psb_desc_type). Input: The communication descriptor.
|
|
! info - integer. Output: Return code
|
|
!
|
|
! itmax - integer(optional) Input: maximum number of iterations to be
|
|
! performed.
|
|
! iter - integer(optional) Output: how many iterations have been
|
|
! performed.
|
|
! err - real (optional) Output: error estimate on exit
|
|
! itrace - integer(optional) Input: print an informational message
|
|
! with the error estimate every itrace
|
|
! iterations
|
|
! irst - integer(optional) Input: restart parameter for RGMRES and
|
|
! BICGSTAB(L) methods
|
|
! istop - integer(optional) Input: stopping criterion, or how
|
|
! to estimate the error.
|
|
! 1: err = |r|/(|a||x|+|b|)
|
|
! 2: err = |r|/|b|
|
|
! where r is the (preconditioned, recursive
|
|
! estimate of) residual
|
|
!
|
|
Subroutine psb_skrylov_vect(method,a,prec,b,x,eps,desc_a,info,&
|
|
& itmax,iter,err,itrace,irst,istop,cond)
|
|
|
|
use psb_base_mod
|
|
use psb_prec_mod,only : psb_sprec_type
|
|
use psb_krylov_mod, psb_protect_name => psb_skrylov_vect
|
|
|
|
character(len=*) :: method
|
|
Type(psb_sspmat_type), Intent(in) :: a
|
|
Type(psb_desc_type), Intent(in) :: desc_a
|
|
class(psb_sprec_type), intent(inout) :: prec
|
|
type(psb_s_vect_type), Intent(inout) :: b
|
|
type(psb_s_vect_type), Intent(inout) :: x
|
|
Real(psb_spk_), Intent(in) :: eps
|
|
integer(psb_ipk_), intent(out) :: info
|
|
integer(psb_ipk_), Optional, Intent(in) :: itmax, itrace, irst,istop
|
|
integer(psb_ipk_), Optional, Intent(out) :: iter
|
|
Real(psb_spk_), Optional, Intent(out) :: err,cond
|
|
|
|
|
|
abstract interface
|
|
subroutine psb_skryl_vect(a,prec,b,x,eps,&
|
|
& desc_a,info,itmax,iter,err,itrace,istop)
|
|
import :: psb_ipk_, psb_spk_, psb_desc_type, &
|
|
& psb_sspmat_type, psb_sprec_type, psb_s_vect_type
|
|
type(psb_sspmat_type), intent(in) :: a
|
|
type(psb_desc_type), intent(in) :: desc_a
|
|
type(psb_s_vect_type), Intent(inout) :: b
|
|
type(psb_s_vect_type), Intent(inout) :: x
|
|
real(psb_spk_), intent(in) :: eps
|
|
class(psb_sprec_type), intent(inout) :: prec
|
|
integer(psb_ipk_), intent(out) :: info
|
|
integer(psb_ipk_), optional, intent(in) :: itmax, itrace,istop
|
|
integer(psb_ipk_), optional, intent(out) :: iter
|
|
real(psb_spk_), optional, intent(out) :: err
|
|
end subroutine psb_skryl_vect
|
|
Subroutine psb_skryl_rest_vect(a,prec,b,x,eps,desc_a,info,&
|
|
&itmax,iter,err, itrace,irst,istop)
|
|
import :: psb_ipk_, psb_spk_, psb_desc_type, &
|
|
& psb_sspmat_type, psb_sprec_type, psb_s_vect_type
|
|
Type(psb_sspmat_type), Intent(in) :: a
|
|
Type(psb_desc_type), Intent(in) :: desc_a
|
|
class(psb_sprec_type), intent(inout) :: prec
|
|
type(psb_s_vect_type), Intent(inout) :: b
|
|
type(psb_s_vect_type), Intent(inout) :: x
|
|
Real(psb_spk_), Intent(in) :: eps
|
|
integer(psb_ipk_), intent(out) :: info
|
|
integer(psb_ipk_), Optional, Intent(in) :: itmax, itrace, irst,istop
|
|
integer(psb_ipk_), Optional, Intent(out) :: iter
|
|
Real(psb_spk_), Optional, Intent(out) :: err
|
|
end subroutine psb_skryl_rest_vect
|
|
Subroutine psb_skryl_cond_vect(a,prec,b,x,eps,desc_a,info,&
|
|
&itmax,iter,err, itrace,istop,cond)
|
|
import :: psb_ipk_, psb_spk_, psb_desc_type, &
|
|
& psb_sspmat_type, psb_sprec_type, psb_s_vect_type
|
|
Type(psb_sspmat_type), Intent(in) :: a
|
|
Type(psb_desc_type), Intent(in) :: desc_a
|
|
class(psb_sprec_type), intent(inout) :: prec
|
|
type(psb_s_vect_type), Intent(inout) :: b
|
|
type(psb_s_vect_type), Intent(inout) :: x
|
|
Real(psb_spk_), Intent(in) :: eps
|
|
integer(psb_ipk_), intent(out) :: info
|
|
integer(psb_ipk_), Optional, Intent(in) :: itmax, itrace,istop
|
|
integer(psb_ipk_), Optional, Intent(out) :: iter
|
|
Real(psb_spk_), Optional, Intent(out) :: err, cond
|
|
end subroutine psb_skryl_cond_vect
|
|
end interface
|
|
|
|
procedure(psb_skryl_vect) :: psb_sbicg_vect, psb_scgstab_vect,&
|
|
& psb_scgs_vect
|
|
procedure(psb_skryl_rest_vect) :: psb_srgmres_vect, psb_scgstabl_vect, psb_scgr_vect
|
|
procedure(psb_skryl_cond_vect) :: psb_scg_vect, psb_sfcg_vect
|
|
|
|
|
|
integer(psb_ipk_) :: ictxt,me,np,err_act
|
|
character(len=20) :: name
|
|
|
|
info = psb_success_
|
|
name = 'psb_krylov'
|
|
call psb_erractionsave(err_act)
|
|
|
|
ictxt=desc_a%get_context()
|
|
|
|
call psb_info(ictxt, me, np)
|
|
|
|
! Default return for COND
|
|
if (present(cond)) cond = szero
|
|
|
|
select case(psb_toupper(method))
|
|
case('CG')
|
|
call psb_scg_vect(a,prec,b,x,eps,desc_a,info,&
|
|
&itmax,iter,err,itrace,istop,cond)
|
|
case('FCG')
|
|
call psb_sfcg_vect(a,prec,b,x,eps,desc_a,info,&
|
|
&itmax,iter,err,itrace,istop,cond)
|
|
case('CGR')
|
|
call psb_scgr_vect(a,prec,b,x,eps,desc_a,info,&
|
|
&itmax,iter,err,itrace,istop)
|
|
case('CGS')
|
|
call psb_scgs_vect(a,prec,b,x,eps,desc_a,info,&
|
|
&itmax,iter,err,itrace,istop)
|
|
case('BICG')
|
|
call psb_sbicg_vect(a,prec,b,x,eps,desc_a,info,&
|
|
&itmax,iter,err,itrace,istop)
|
|
case('BICGSTAB')
|
|
call psb_scgstab_vect(a,prec,b,x,eps,desc_a,info,&
|
|
&itmax,iter,err,itrace,istop)
|
|
case('RGMRES')
|
|
call psb_srgmres_vect(a,prec,b,x,eps,desc_a,info,&
|
|
&itmax,iter,err,itrace,irst,istop)
|
|
case('BICGSTABL')
|
|
call psb_scgstabl_vect(a,prec,b,x,eps,desc_a,info,&
|
|
&itmax,iter,err,itrace,irst,istop)
|
|
case default
|
|
if (me == 0) write(psb_err_unit,*) trim(name),&
|
|
& ': Warning: Unknown method ',method,&
|
|
& ', defaulting to BiCGSTAB'
|
|
call psb_scgstab_vect(a,prec,b,x,eps,desc_a,info,&
|
|
&itmax,iter,err,itrace,istop)
|
|
end select
|
|
|
|
if(info /= psb_success_) then
|
|
call psb_errpush(info,name)
|
|
goto 9999
|
|
end if
|
|
|
|
call psb_erractionrestore(err_act)
|
|
return
|
|
|
|
9999 call psb_error_handler(ictxt,err_act)
|
|
|
|
return
|
|
|
|
end subroutine psb_skrylov_vect
|
|
|