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amg4psblas/mlprec/mld_zprec_aply.f90

257 lines
8.4 KiB
Fortran

!!$
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!!$
!!$ MLD2P4
!!$ MultiLevel Domain Decomposition Parallel Preconditioners Package
!!$ based on PSBLAS (Parallel Sparse BLAS v.2.0)
!!$
!!$ (C) Copyright 2007 Alfredo Buttari University of Rome Tor Vergata
!!$ Pasqua D'Ambra ICAR-CNR, Naples
!!$ Daniela di Serafino Second University of Naples
!!$ Salvatore Filippone University of Rome Tor Vergata
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!!$
!!$ 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 MLD2P4 group or the names of its contributors may
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!!$ 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 MLD2P4 GROUP OR ITS CONTRIBUTORS
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!!$ 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: mld_zprec_aply.f90
!
! Subroutine: mld_zprec_aply
! Version: complex
!
! This routine applies the preconditioner built by mld_zprecbld, i.e. it computes
!
! Y = op(M^(-1)) * X,
! where
! - M is the preconditioner,
! - op(M^(-1)) is M^(-1) or its transpose, according to the value of trans,
! - X and Y are vectors.
! This operation is performed at each iteration of a preconditioned Krylov solver.
!
!
! Arguments:
! prec - type(mld_zprec_type), input.
! The preconditioner data structure containing the local part
! of the preconditioner to be applied.
! x - complex(kind(0.d0)), dimension(:), input.
! The local part of the vector X in Y := op(M^(-1)) * X.
! y - complex(kind(0.d0)), dimension(:), output.
! The local part of the vector Y in Y := op(M^(-1)) * X.
! desc_data - type(psb_desc_type), input.
! The communication descriptor associated to the matrix to be
! preconditioned.
! info - integer, output.
! Error code.
! trans - character(len=1), optional.
! If trans='N','n' then op(M^(-1)) = M^(-1);
! if trans='T','t' then op(M^(-1)) = M^(-T) (transpose of M^(-1)).
! work - complex(kind(0.d0)), dimension (:), optional, target.
! Workspace. Its size must be at
! least 4*psb_cd_get_local_cols(desc_data).
!
subroutine mld_zprec_aply(prec,x,y,desc_data,info,trans,work)
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use psb_base_mod
use mld_prec_mod, mld_protect_name => mld_zprec_aply
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implicit none
! Arguments
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type(psb_desc_type),intent(in) :: desc_data
type(mld_zprec_type), intent(in) :: prec
complex(kind(0.d0)),intent(in) :: x(:)
complex(kind(0.d0)),intent(inout) :: y(:)
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integer, intent(out) :: info
character(len=1), optional :: trans
complex(kind(0.d0)), optional, target :: work(:)
! Local variables
character :: trans_
complex(kind(1.d0)), pointer :: work_(:)
integer :: ictxt,np,me,err_act,iwsz
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character(len=20) :: name
name='mld_zprec_aply'
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info = 0
call psb_erractionsave(err_act)
ictxt = psb_cd_get_context(desc_data)
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call psb_info(ictxt, me, np)
if (present(trans)) then
trans_=toupper(trans)
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else
trans_='N'
end if
if (present(work)) then
work_ => work
else
iwsz = max(1,4*psb_cd_get_local_cols(desc_data))
allocate(work_(iwsz),stat=info)
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if (info /= 0) then
call psb_errpush(4025,name,i_err=(/iwsz,0,0,0,0/),&
& a_err='complex(kind(1.d0))')
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goto 9999
end if
end if
if (.not.(allocated(prec%baseprecv))) then
!! Error 1: should call mld_dprecbld
info=3112
call psb_errpush(info,name)
goto 9999
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end if
if (size(prec%baseprecv) >1) then
call mld_mlprec_aply(zone,prec%baseprecv,x,zzero,y,desc_data,trans_,work_,info)
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if(info /= 0) then
call psb_errpush(4010,name,a_err='mld_zmlprec_aply')
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goto 9999
end if
else if (size(prec%baseprecv) == 1) then
call mld_baseprec_aply(zone,prec%baseprecv(1),x,zzero,y,desc_data,trans_, work_,info)
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else
info = 4013
call psb_errpush(info,name,a_err='Invalid size of baseprecv',&
& i_Err=(/size(prec%baseprecv),0,0,0,0/))
goto 9999
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endif
! If the original distribution has an overlap we should fix that.
call psb_ovrl(y,desc_data,info,update=psb_avg_)
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if (present(work)) then
else
deallocate(work_)
end if
call psb_erractionrestore(err_act)
return
9999 continue
call psb_erractionrestore(err_act)
if (err_act.eq.psb_act_abort_) then
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call psb_error()
return
end if
return
end subroutine mld_zprec_aply
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! File: mld_zprec_aply.f90.
!
! Subroutine: mld_zprec_aply1.
! Version: complex.
!
! Applies the preconditioner built by mld_zprecbld, i.e. computes
!
! X = op(M^(-1)) * X,
! where
! - M is the preconditioner,
! - op(M^(-1)) is M^(-1) or its transpose, according to the value of trans,
! - X is a vectors.
! This operation is performed at each iteration of a preconditioned Krylov solver.
!
! This routine differs from mld_zprec_aply because the preconditioned vector X
! overwrites the original one.
!
!
! Arguments:
! prec - type(mld_zprec_type), input.
! The preconditioner data structure containing the local part
! of the preconditioner to be applied.
! x - complex(kind(0.d0)), dimension(:), input/output.
! The local part of vector X in X := op(M^(-1)) * X.
! desc_data - type(psb_desc_type), input.
! The communication descriptor associated to the matrix to be
! preconditioned.
! info - integer, output.
! Error code.
! trans - character(len=1), optional.
! If trans='N','n' then op(M^(-1)) = M^(-1);
! if trans='T','t' then op(M^(-1)) = M^(-T) (transpose of M^(-1)).
!
subroutine mld_zprec_aply1(prec,x,desc_data,info,trans)
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use psb_base_mod
use mld_prec_mod, mld_protect_name => mld_zprec_aply1
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implicit none
! Arguments
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type(psb_desc_type),intent(in) :: desc_data
type(mld_zprec_type), intent(in) :: prec
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complex(kind(0.d0)),intent(inout) :: x(:)
integer, intent(out) :: info
character(len=1), optional :: trans
! Local variables
integer :: ictxt,np,me, err_act
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complex(kind(1.d0)), pointer :: WW(:), w1(:)
character(len=20) :: name
name='mld_zprec_aply1'
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info = 0
call psb_erractionsave(err_act)
ictxt = psb_cd_get_context(desc_data)
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call psb_info(ictxt, me, np)
allocate(ww(size(x)),w1(size(x)),stat=info)
if (info /= 0) then
info=4025
call psb_errpush(info,name,i_err=(/2*size(x),0,0,0,0/),&
& a_err='complex(kind(1.d0))')
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goto 9999
end if
call mld_precaply(prec,x,ww,desc_data,info,trans=trans,work=w1)
if (info /= 0) then
call psb_errpush(4010,name,a_err='mld_precaply')
goto 9999
end if
x(:) = ww(:)
deallocate(ww,W1,stat=info)
if (info /= 0) then
info = 4000
call psb_errpush(info,name)
goto 9999
end if
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call psb_erractionrestore(err_act)
return
9999 continue
call psb_erractionrestore(err_act)
if (err_act.eq.psb_act_abort_) then
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call psb_error()
return
end if
return
end subroutine mld_zprec_aply1