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psblas3/prec/psb_d_nullprec.f90

290 lines
8.9 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.
!!$
!!$
module psb_d_nullprec
use psb_d_base_prec_mod
type, extends(psb_d_base_prec_type) :: psb_d_null_prec_type
contains
procedure, pass(prec) :: d_apply_v => psb_d_null_apply_vect
procedure, pass(prec) :: d_apply => psb_d_null_apply
procedure, pass(prec) :: precbld => psb_d_null_precbld
procedure, pass(prec) :: precinit => psb_d_null_precinit
procedure, pass(prec) :: precdescr => psb_d_null_precdescr
procedure, pass(prec) :: sizeof => psb_d_null_sizeof
procedure, pass(prec) :: dump => psb_d_null_dump
procedure, pass(prec) :: clone => psb_d_null_clone
procedure, pass(prec) :: free => psb_d_null_precfree
end type psb_d_null_prec_type
private :: psb_d_null_precbld, psb_d_null_sizeof,&
& psb_d_null_precinit, psb_d_null_precfree, psb_d_null_precdescr
interface
subroutine psb_d_null_apply_vect(alpha,prec,x,beta,y,desc_data,info,trans,work)
import :: psb_ipk_, psb_desc_type, psb_d_null_prec_type, psb_d_vect_type, psb_dpk_
type(psb_desc_type),intent(in) :: desc_data
class(psb_d_null_prec_type), intent(inout) :: prec
type(psb_d_vect_type),intent(inout) :: x
real(psb_dpk_),intent(in) :: alpha, beta
type(psb_d_vect_type),intent(inout) :: y
integer(psb_ipk_), intent(out) :: info
character(len=1), optional :: trans
real(psb_dpk_),intent(inout), optional, target :: work(:)
end subroutine psb_d_null_apply_vect
end interface
interface
subroutine psb_d_null_apply(alpha,prec,x,beta,y,desc_data,info,trans,work)
import :: psb_ipk_, psb_desc_type, psb_d_null_prec_type, psb_dpk_
type(psb_desc_type),intent(in) :: desc_data
class(psb_d_null_prec_type), intent(inout) :: prec
real(psb_dpk_),intent(inout) :: x(:)
real(psb_dpk_),intent(in) :: alpha, beta
real(psb_dpk_),intent(inout) :: y(:)
integer(psb_ipk_), intent(out) :: info
character(len=1), optional :: trans
real(psb_dpk_),intent(inout), optional, target :: work(:)
end subroutine psb_d_null_apply
end interface
contains
subroutine psb_d_null_precinit(prec,info)
Implicit None
class(psb_d_null_prec_type),intent(inout) :: prec
integer(psb_ipk_), intent(out) :: info
integer(psb_ipk_) :: err_act, nrow
character(len=20) :: name='d_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_d_null_precinit
subroutine psb_d_null_precbld(a,desc_a,prec,info,upd,amold,afmt,vmold)
Implicit None
type(psb_dspmat_type), intent(in), target :: a
type(psb_desc_type), intent(in), target :: desc_a
class(psb_d_null_prec_type),intent(inout) :: prec
integer(psb_ipk_), intent(out) :: info
character, intent(in), optional :: upd
character(len=*), intent(in), optional :: afmt
class(psb_d_base_sparse_mat), intent(in), optional :: amold
class(psb_d_base_vect_type), intent(in), optional :: vmold
integer(psb_ipk_) :: err_act, nrow
character(len=20) :: name='d_null_precbld'
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_d_null_precbld
subroutine psb_d_null_precfree(prec,info)
Implicit None
class(psb_d_null_prec_type), intent(inout) :: prec
integer(psb_ipk_), intent(out) :: info
integer(psb_ipk_) :: err_act, nrow
character(len=20) :: name='d_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_d_null_precfree
subroutine psb_d_null_precdescr(prec,iout)
Implicit None
class(psb_d_null_prec_type), intent(in) :: prec
integer(psb_ipk_), intent(in), optional :: iout
integer(psb_ipk_) :: err_act, nrow, info
character(len=20) :: name='d_null_precset'
integer(psb_ipk_) :: iout_
call psb_erractionsave(err_act)
info = psb_success_
if (present(iout)) then
iout_ = iout
else
iout_ = 6
end if
write(iout_,*) 'No preconditioning'
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(err_act)
return
end subroutine psb_d_null_precdescr
subroutine psb_d_null_dump(prec,info,prefix,head)
use psb_base_mod, only : psb_info
implicit none
class(psb_d_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_d"
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_d_null_dump
function psb_d_null_sizeof(prec) result(val)
class(psb_d_null_prec_type), intent(in) :: prec
integer(psb_long_int_k_) :: val
val = 0
return
end function psb_d_null_sizeof
subroutine psb_d_null_clone(prec,precout,info)
use psb_const_mod
use psb_error_mod
Implicit None
class(psb_d_null_prec_type), intent(inout) :: prec
class(psb_d_base_prec_type), allocatable, intent(inout) :: precout
integer(psb_ipk_), intent(out) :: info
integer(psb_ipk_) :: err_act, i
character(len=20) :: name='d_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_d_null_prec_type :: precout, stat=info)
if (info /= 0) goto 9999
select type(pout => precout)
type is (psb_d_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_d_null_clone
end module psb_d_nullprec