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261 lines
8.4 KiB
Fortran
261 lines
8.4 KiB
Fortran
!!$
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!!$
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!!$ MLD2P4 version 1.0
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!!$ MultiLevel Domain Decomposition Parallel Preconditioners Package
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!!$ based on PSBLAS (Parallel Sparse BLAS version 2.2)
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!!$
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!!$ (C) Copyright 2008
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!!$
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!!$ Salvatore Filippone University of Rome Tor Vergata
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!!$ Alfredo Buttari University of Rome Tor Vergata
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!!$ Pasqua D'Ambra ICAR-CNR, Naples
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!!$ Daniela di Serafino Second University of Naples
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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 MLD2P4 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 MLD2P4 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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! File: mld_sprec_aply.f90
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!
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! Subroutine: mld_sprec_aply
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! Version: real
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!
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! This routine applies the preconditioner built by mld_sprecbld, i.e. it computes
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!
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! Y = op(M^(-1)) * X,
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! where
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! - M is the preconditioner,
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! - op(M^(-1)) is M^(-1) or its transpose, according to the value of trans,
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! - X and Y are vectors.
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! This operation is performed at each iteration of a preconditioned Krylov solver.
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!
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!
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! Arguments:
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! prec - type(mld_sprec_type), input.
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! The preconditioner data structure containing the local part
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! of the preconditioner to be applied.
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! x - real(psb_spk_), dimension(:), input.
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! The local part of the vector X in Y := op(M^(-1)) * X.
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! y - real(psb_spk_), dimension(:), output.
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! The local part of the vector Y in Y := op(M^(-1)) * X.
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! desc_data - type(psb_desc_type), input.
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! The communication descriptor associated to the matrix to be
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! preconditioned.
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! info - integer, output.
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! Error code.
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! trans - character(len=1), optional.
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! If trans='N','n' then op(M^(-1)) = M^(-1);
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! if trans='T','t' then op(M^(-1)) = M^(-T) (transpose of M^(-1)).
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! work - real(psb_spk_), dimension (:), optional, target.
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! Workspace. Its size must be at
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! least 4*psb_cd_get_local_cols(desc_data).
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!
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subroutine mld_sprec_aply(prec,x,y,desc_data,info,trans,work)
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use psb_base_mod
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use mld_inner_mod
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use mld_prec_mod, mld_protect_name => mld_sprec_aply
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implicit none
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! Arguments
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type(psb_desc_type),intent(in) :: desc_data
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type(mld_sprec_type), intent(in) :: prec
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real(psb_spk_),intent(in) :: x(:)
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real(psb_spk_),intent(inout) :: y(:)
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integer, intent(out) :: info
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character(len=1), optional :: trans
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real(psb_spk_), optional, target :: work(:)
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! Local variables
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character :: trans_
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real(psb_spk_), pointer :: work_(:)
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integer :: ictxt,np,me,err_act,iwsz
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character(len=20) :: name
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name='mld_sprec_aply'
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info = 0
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call psb_erractionsave(err_act)
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ictxt = psb_cd_get_context(desc_data)
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call psb_info(ictxt, me, np)
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if (present(trans)) then
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trans_=psb_toupper(trans)
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else
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trans_='N'
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end if
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if (present(work)) then
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work_ => work
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else
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iwsz = max(1,4*psb_cd_get_local_cols(desc_data))
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allocate(work_(iwsz),stat=info)
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if (info /= 0) then
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call psb_errpush(4025,name,i_err=(/iwsz,0,0,0,0/),&
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&a_err='real(psb_spk_)')
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goto 9999
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end if
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end if
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if (.not.(allocated(prec%baseprecv))) then
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!! Error 1: should call mld_sprecbld
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info=3112
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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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if (size(prec%baseprecv) >1) then
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call mld_mlprec_aply(sone,prec%baseprecv,x,szero,y,desc_data,trans_,work_,info)
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if(info /= 0) then
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call psb_errpush(4010,name,a_err='mld_smlprec_aply')
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goto 9999
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end if
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else if (size(prec%baseprecv) == 1) then
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call mld_baseprec_aply(sone,prec%baseprecv(1),x,szero,y,desc_data,trans_, work_,info)
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else
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info = 4013
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call psb_errpush(info,name,a_err='Invalid size of baseprecv',&
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& i_Err=(/size(prec%baseprecv),0,0,0,0/))
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goto 9999
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endif
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! If the original distribution has an overlap we should fix that.
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call psb_halo(y,desc_data,info,data=psb_comm_mov_)
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if (present(work)) then
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else
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deallocate(work_)
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end if
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act.eq.psb_act_abort_) then
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call psb_error()
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return
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end if
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return
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end subroutine mld_sprec_aply
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!
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! Subroutine: mld_sprec_aply1
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! Version: real
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!
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! Applies the preconditioner built by mld_sprecbld, i.e. computes
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!
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! X = op(M^(-1)) * X,
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! where
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! - M is the preconditioner,
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! - op(M^(-1)) is M^(-1) or its transpose, according to the value of trans,
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! - X is a vectors.
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! This operation is performed at each iteration of a preconditioned Krylov solver.
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!
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! This routine differs from mld_sprec_aply because the preconditioned vector X
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! overwrites the original one.
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!
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!
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! Arguments:
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! prec - type(mld_sprec_type), input.
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! The preconditioner data structure containing the local part
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! of the preconditioner to be applied.
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! x - real(psb_spk_), dimension(:), input/output.
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! The local part of vector X in X := op(M^(-1)) * X.
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! desc_data - type(psb_desc_type), input.
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! The communication descriptor associated to the matrix to be
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! preconditioned.
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! info - integer, output.
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! Error code.
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! trans - character(len=1), optional.
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! If trans='N','n' then op(M^(-1)) = M^(-1);
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! if trans='T','t' then op(M^(-1)) = M^(-T) (transpose of M^(-1)).
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!
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subroutine mld_sprec_aply1(prec,x,desc_data,info,trans)
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use psb_base_mod
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use mld_inner_mod
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use mld_prec_mod, mld_protect_name => mld_sprec_aply1
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implicit none
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! Arguments
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type(psb_desc_type),intent(in) :: desc_data
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type(mld_sprec_type), intent(in) :: prec
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real(psb_spk_),intent(inout) :: x(:)
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integer, intent(out) :: info
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character(len=1), optional :: trans
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! Local variables
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integer :: ictxt,np,me, err_act
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real(psb_spk_), pointer :: WW(:), w1(:)
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character(len=20) :: name
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name='mld_sprec_aply1'
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info = 0
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call psb_erractionsave(err_act)
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ictxt = psb_cd_get_context(desc_data)
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call psb_info(ictxt, me, np)
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allocate(ww(size(x)),w1(size(x)),stat=info)
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if (info /= 0) then
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info=4025
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call psb_errpush(info,name,i_err=(/2*size(x),0,0,0,0/),&
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& a_err='real(psb_spk_)')
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goto 9999
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end if
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call mld_precaply(prec,x,ww,desc_data,info,trans=trans,work=w1)
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if (info /= 0) then
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call psb_errpush(4010,name,a_err='mld_precaply')
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goto 9999
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end if
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x(:) = ww(:)
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deallocate(ww,W1,stat=info)
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if (info /= 0) then
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info = 4000
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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 psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act.eq.psb_act_abort_) then
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call psb_error()
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return
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end if
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return
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end subroutine mld_sprec_aply1
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