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