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!!$
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!!$
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!!$ MD2P4
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!!$ Multilevel Domain Decomposition Parallel Preconditioner Package for PSBLAS
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!!$ for
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!!$ Parallel Sparse BLAS v2.0
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!!$ (C) Copyright 2006 Salvatore Filippone University of Rome Tor Vergata
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!!$ Alfredo Buttari University of Rome Tor Vergata
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!!$ Daniela di Serafino Second University of Naples
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!!$ Pasqua D'Ambra ICAR-CNR
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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 MD2P4 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 MD2P4 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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subroutine psb_dbaseprc_aply(alpha,prec,x,beta,y,desc_data,trans,work,info)
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!
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! Compute Y <- beta*Y + alpha*K^-1 X
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! where K is a a basic preconditioner stored in prec
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!
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use psb_base_mod
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use psb_prec_type
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implicit none
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type(psb_desc_type),intent(in) :: desc_data
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type(psb_dbaseprc_type), intent(in) :: prec
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real(kind(0.d0)),intent(inout) :: x(:), y(:)
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real(kind(0.d0)),intent(in) :: alpha,beta
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character(len=1) :: trans
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real(kind(0.d0)),target :: work(:)
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integer, intent(out) :: info
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! Local variables
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integer :: n_row,n_col, int_err(5)
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real(kind(1.d0)), pointer :: ww(:), aux(:), tx(:),ty(:)
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character ::diagl, diagu
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integer :: ictxt,np,me,i, isz, nrg, err_act
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real(kind(1.d0)) :: t1, t2, t3, t4, t5, t6, t7, mpi_wtime
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logical,parameter :: debug=.false., debugprt=.false.
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external mpi_wtime
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character(len=20) :: name, ch_err
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interface psb_bjac_aply
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subroutine psb_dbjac_aply(alpha,prec,x,beta,y,desc_data,trans,work,info)
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use psb_base_mod
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use psb_prec_type
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type(psb_desc_type), intent(in) :: desc_data
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type(psb_dbaseprc_type), intent(in) :: prec
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real(kind(0.d0)),intent(inout) :: x(:), y(:)
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real(kind(0.d0)),intent(in) :: alpha,beta
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character(len=1) :: trans
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real(kind(0.d0)),target :: work(:)
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integer, intent(out) :: info
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end subroutine psb_dbjac_aply
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end interface
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name='psb_dbaseprc_aply'
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info = 0
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call psb_erractionsave(err_act)
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ictxt=desc_data%matrix_data(psb_ctxt_)
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call psb_info(ictxt, me, np)
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diagl='U'
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diagu='U'
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select case(trans)
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case('N','n')
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case('T','t','C','c')
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case default
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info=40
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int_err(1)=6
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ch_err(2:2)=trans
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goto 9999
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end select
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select case(prec%iprcparm(p_type_))
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case(noprec_)
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call psb_geaxpby(alpha,x,beta,y,desc_data,info)
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case(diagsc_)
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if (size(work) >= size(x)) then
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ww => work
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else
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allocate(ww(size(x)),stat=info)
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if (info /= 0) then
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call psb_errpush(4010,name,a_err='Allocate')
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goto 9999
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end if
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end if
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n_row=desc_data%matrix_data(psb_n_row_)
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ww(1:n_row) = x(1:n_row)*prec%d(1:n_row)
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call psb_geaxpby(alpha,ww,beta,y,desc_data,info)
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if (size(work) < size(x)) then
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deallocate(ww,stat=info)
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if (info /= 0) then
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call psb_errpush(4010,name,a_err='Deallocate')
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goto 9999
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end if
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end if
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case(bja_)
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call psb_bjac_aply(alpha,prec,x,beta,y,desc_data,trans,work,info)
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if(info.ne.0) then
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info=4010
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ch_err='psb_bjac_aply'
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goto 9999
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end if
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case(asm_,ras_,ash_,rash_)
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if (prec%iprcparm(n_ovr_)==0) then
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! shortcut: this fixes performance for RAS(0) == BJA
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call psb_bjac_aply(alpha,prec,x,beta,y,desc_data,trans,work,info)
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if(info.ne.0) then
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info=4010
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ch_err='psb_bjacaply'
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goto 9999
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end if
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else
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! Note: currently trans is unused.
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n_row=prec%desc_data%matrix_data(psb_n_row_)
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n_col=prec%desc_data%matrix_data(psb_n_col_)
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isz=max(n_row,N_COL)
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if ((6*isz) <= size(work)) then
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ww => work(1:isz)
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tx => work(isz+1:2*isz)
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ty => work(2*isz+1:3*isz)
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aux => work(3*isz+1:)
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else if ((4*isz) <= size(work)) then
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aux => work(1:)
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allocate(ww(isz),tx(isz),ty(isz),stat=info)
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if (info /= 0) then
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call psb_errpush(4010,name,a_err='Allocate')
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goto 9999
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end if
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else if ((3*isz) <= size(work)) then
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ww => work(1:isz)
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tx => work(isz+1:2*isz)
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ty => work(2*isz+1:3*isz)
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allocate(aux(4*isz),stat=info)
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if (info /= 0) then
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call psb_errpush(4010,name,a_err='Allocate')
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goto 9999
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end if
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else
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allocate(ww(isz),tx(isz),ty(isz),&
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&aux(4*isz),stat=info)
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if (info /= 0) then
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call psb_errpush(4010,name,a_err='Allocate')
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goto 9999
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end if
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endif
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if (debugprt) write(0,*)' vdiag: ',prec%d(:)
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if (debug) write(0,*) 'Bi-CGSTAB with Additive Schwarz prec'
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tx(1:desc_data%matrix_data(psb_n_row_)) = x(1:desc_data%matrix_data(psb_n_row_))
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tx(desc_data%matrix_data(psb_n_row_)+1:isz) = dzero
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if (prec%iprcparm(restr_)==psb_halo_) then
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call psb_halo(tx,prec%desc_data,info,work=aux,data=psb_comm_ext_)
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if(info /=0) then
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info=4010
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ch_err='psb_halo'
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goto 9999
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end if
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else if (prec%iprcparm(restr_) /= psb_none_) then
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write(0,*) 'Problem in PRC_APLY: Unknown value for restriction ',&
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&prec%iprcparm(restr_)
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end if
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if (prec%iprcparm(iren_)>0) then
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call dgelp('N',n_row,1,prec%perm,tx,isz,ww,isz,info)
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if(info /=0) then
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info=4010
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ch_err='psb_dgelp'
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goto 9999
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end if
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endif
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call psb_bjac_aply(done,prec,tx,dzero,ty,prec%desc_data,trans,aux,info)
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if(info.ne.0) then
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info=4010
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ch_err='psb_bjac_aply'
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goto 9999
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end if
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if (prec%iprcparm(iren_)>0) then
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call dgelp('N',n_row,1,prec%invperm,ty,isz,ww,isz,info)
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if(info /=0) then
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info=4010
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ch_err='psb_dgelp'
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goto 9999
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end if
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endif
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select case (prec%iprcparm(prol_))
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case(psb_none_)
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! Would work anyway, but since it's supposed to do nothing...
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! call f90_psovrl(ty,prec%desc_data,update=prec%a_restrict)
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case(psb_sum_,psb_avg_)
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call psb_ovrl(ty,prec%desc_data,info,&
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& update=prec%iprcparm(prol_),work=aux)
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if(info /=0) then
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info=4010
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ch_err='psb_ovrl'
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goto 9999
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end if
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case default
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write(0,*) 'Problem in PRC_APLY: Unknown value for prolongation ',&
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& prec%iprcparm(prol_)
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end select
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call psb_geaxpby(alpha,ty,beta,y,desc_data,info)
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if ((6*isz) <= size(work)) then
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else if ((4*isz) <= size(work)) then
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deallocate(ww,tx,ty)
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else if ((3*isz) <= size(work)) then
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deallocate(aux)
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else
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deallocate(ww,aux,tx,ty)
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endif
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end if
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case default
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write(0,*) 'Invalid PRE%PREC ',prec%iprcparm(p_type_),':',&
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& min_prec_,noprec_,diagsc_,bja_,&
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& asm_,ras_,ash_,rash_
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end select
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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_errpush(info,name,i_err=int_err,a_err=ch_err)
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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 psb_dbaseprc_aply
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