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psblas3/prec/psb_s_nullprec.f90

307 lines
9.3 KiB
Fortran

!
! Parallel Sparse BLAS version 3.5
! (C) Copyright 2006, 2010, 2015, 2017
! Salvatore Filippone Cranfield University
! 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.
!
!
module psb_s_nullprec
use psb_s_base_prec_mod
type, extends(psb_s_base_prec_type) :: psb_s_null_prec_type
contains
procedure, pass(prec) :: s_apply_v => psb_s_null_apply_vect
procedure, pass(prec) :: s_apply => psb_s_null_apply
procedure, pass(prec) :: precbld => psb_s_null_precbld
procedure, pass(prec) :: precinit => psb_s_null_precinit
procedure, pass(prec) :: precdescr => psb_s_null_precdescr
procedure, pass(prec) :: sizeof => psb_s_null_sizeof
procedure, pass(prec) :: dump => psb_s_null_dump
procedure, pass(prec) :: clone => psb_s_null_clone
procedure, pass(prec) :: free => psb_s_null_precfree
end type psb_s_null_prec_type
private :: psb_s_null_precbld, psb_s_null_sizeof,&
& psb_s_null_precinit, psb_s_null_precfree, psb_s_null_precdescr
interface
subroutine psb_s_null_apply_vect(alpha,prec,x,beta,y,desc_data,info,trans,work)
import :: psb_ipk_, psb_desc_type, psb_s_null_prec_type, psb_s_vect_type, psb_spk_
type(psb_desc_type),intent(in) :: desc_data
class(psb_s_null_prec_type), intent(inout) :: prec
type(psb_s_vect_type),intent(inout) :: x
real(psb_spk_),intent(in) :: alpha, beta
type(psb_s_vect_type),intent(inout) :: y
integer(psb_ipk_), intent(out) :: info
character(len=1), optional :: trans
real(psb_spk_),intent(inout), optional, target :: work(:)
end subroutine psb_s_null_apply_vect
end interface
interface
subroutine psb_s_null_apply(alpha,prec,x,beta,y,desc_data,info,trans,work)
import :: psb_ipk_, psb_desc_type, psb_s_null_prec_type, psb_spk_
type(psb_desc_type),intent(in) :: desc_data
class(psb_s_null_prec_type), intent(inout) :: prec
real(psb_spk_),intent(inout) :: x(:)
real(psb_spk_),intent(in) :: alpha, beta
real(psb_spk_),intent(inout) :: y(:)
integer(psb_ipk_), intent(out) :: info
character(len=1), optional :: trans
real(psb_spk_),intent(inout), optional, target :: work(:)
end subroutine psb_s_null_apply
end interface
contains
subroutine psb_s_null_precinit(prec,info)
Implicit None
class(psb_s_null_prec_type),intent(inout) :: prec
integer(psb_ipk_), intent(out) :: info
integer(psb_ipk_) :: err_act, nrow
character(len=20) :: name='s_null_precinit'
call psb_erractionsave(err_act)
info = psb_success_
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(err_act)
return
end subroutine psb_s_null_precinit
subroutine psb_s_null_precbld(a,desc_a,prec,info,amold,vmold,imold)
Implicit None
type(psb_sspmat_type), intent(in), target :: a
type(psb_desc_type), intent(inout), target :: desc_a
class(psb_s_null_prec_type),intent(inout) :: prec
integer(psb_ipk_), intent(out) :: info
class(psb_s_base_sparse_mat), intent(in), optional :: amold
class(psb_s_base_vect_type), intent(in), optional :: vmold
class(psb_i_base_vect_type), intent(in), optional :: imold
integer(psb_ipk_) :: err_act, nrow
character(len=20) :: name='s_null_precbld'
call psb_erractionsave(err_act)
info = psb_success_
call prec%set_ctxt(desc_a%get_ctxt())
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(err_act)
return
end subroutine psb_s_null_precbld
subroutine psb_s_null_precfree(prec,info)
Implicit None
class(psb_s_null_prec_type), intent(inout) :: prec
integer(psb_ipk_), intent(out) :: info
integer(psb_ipk_) :: err_act, nrow
character(len=20) :: name='s_null_precset'
call psb_erractionsave(err_act)
info = psb_success_
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(err_act)
return
end subroutine psb_s_null_precfree
subroutine psb_s_null_precdescr(prec,iout,root)
use psb_penv_mod
use psb_error_mod
Implicit None
class(psb_s_null_prec_type), intent(in) :: prec
integer(psb_ipk_), intent(in), optional :: iout
integer(psb_ipk_), intent(in), optional :: root
integer(psb_ipk_) :: err_act, nrow, info
character(len=20) :: name='s_null_precset'
character(len=32) :: dprefix, frmtv
integer(psb_ipk_) :: ni
integer(psb_ipk_) :: iout_, ictxt, iam, np, root_
call psb_erractionsave(err_act)
info = psb_success_
if (present(iout)) then
iout_ = iout
else
iout_ = 6
end if
if (present(root)) then
root_ = root
else
root_ = psb_root_
end if
ictxt = prec%ictxt
call psb_info(ictxt,iam,np)
if (root_ == -1) root_ = iam
if (iam == root_) &
& write(iout_,*) trim(prec%desc_prefix()),' ',&
& 'No preconditioning'
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(err_act)
return
end subroutine psb_s_null_precdescr
subroutine psb_s_null_dump(prec,info,prefix,head)
use psb_base_mod, only : psb_info
implicit none
class(psb_s_null_prec_type), intent(in) :: prec
integer(psb_ipk_), intent(out) :: info
character(len=*), intent(in), optional :: prefix,head
integer(psb_ipk_) :: iout, iam, np, ictxt, lname
logical :: isopen
character(len=80) :: prefix_
character(len=120) :: fname ! len should be at least 20 more than
! len of prefix_
info = 0
ictxt = prec%get_ctxt()
call psb_info(ictxt,iam,np)
if (present(prefix)) then
prefix_ = trim(prefix(1:min(len(prefix),len(prefix_))))
else
prefix_ = "dump_null_s"
end if
lname = len_trim(prefix_)
fname = trim(prefix_)
write(fname(lname+1:lname+5),'(a,i3.3)') '_p',iam
lname = lname + 5
! Search for an unused unit to write
iout = 7
do
inquire(unit=iout, opened=isopen)
if (.not.isopen) exit
iout = iout + 1
if (iout > 99) exit
end do
if (iout > 99) then
write(psb_err_unit,*) 'Error: could not find a free unit for I/O'
return
end if
open(iout,file=fname,iostat=info)
write(iout,*) 'Null (Identity) Preconditioner. Nothing to be printed, really!'
end subroutine psb_s_null_dump
function psb_s_null_sizeof(prec) result(val)
class(psb_s_null_prec_type), intent(in) :: prec
integer(psb_long_int_k_) :: val
val = 0
return
end function psb_s_null_sizeof
subroutine psb_s_null_clone(prec,precout,info)
use psb_const_mod
use psb_error_mod
Implicit None
class(psb_s_null_prec_type), intent(inout) :: prec
class(psb_s_base_prec_type), allocatable, intent(inout) :: precout
integer(psb_ipk_), intent(out) :: info
integer(psb_ipk_) :: err_act, i
character(len=20) :: name='s_null_clone'
call psb_erractionsave(err_act)
info = psb_success_
if (allocated(precout)) then
call precout%free(info)
if (info == psb_success_) deallocate(precout, stat=info)
end if
if (info == psb_success_) &
& allocate(psb_s_null_prec_type :: precout, stat=info)
if (info /= 0) goto 9999
select type(pout => precout)
type is (psb_s_null_prec_type)
call pout%set_ctxt(prec%get_ctxt())
class default
info = psb_err_internal_error_
end select
if (info /= 0) goto 9999
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(err_act)
return
end subroutine psb_s_null_clone
end module psb_s_nullprec