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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_dgenaggrmap(aggr_type,a,desc_a,nlaggr,ilaggr,info)
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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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integer, intent(in) :: aggr_type
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type(psb_dspmat_type), intent(in) :: a
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type(psb_desc_type), intent(in) :: desc_a
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integer, allocatable :: ilaggr(:),nlaggr(:)
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integer, intent(out) :: info
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! Locals
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integer, allocatable :: ils(:), neigh(:)
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integer :: icnt,nlp,k,n,ia,isz,nr, naggr,i,j,m
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logical :: recovery
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logical, parameter :: debug=.false.
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integer ::ictxt,np,me,err_act
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integer :: nrow, ncol, n_ne
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integer, parameter :: one=1, two=2
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character(len=20) :: name, ch_err
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if(psb_get_errstatus().ne.0) return
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info=0
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name = 'psb_bldaggrmat'
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call psb_erractionsave(err_act)
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!
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! Note. At the time being we are ignoring aggr_type
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! so that we only have local decoupled aggregation. This might
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! change in the future.
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!
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ictxt=psb_cd_get_context(desc_a)
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call psb_info(ictxt,me,np)
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nrow = psb_cd_get_local_rows(desc_a)
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ncol = psb_cd_get_local_cols(desc_a)
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nr = a%m
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allocate(ilaggr(nr),neigh(nr),stat=info)
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if(info.ne.0) then
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info=4000
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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do i=1, nr
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ilaggr(i) = -(nr+1)
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end do
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! Note: -(nr+1) Untouched as yet
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! -i 1<=i<=nr Adjacent to aggregate i
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! i 1<=i<=nr Belonging to aggregate i
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!
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! Phase one: group nodes together.
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! Very simple minded strategy.
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!
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naggr = 0
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nlp = 0
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do
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icnt = 0
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do i=1, nr
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if (ilaggr(i) == -(nr+1)) then
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!
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! 1. Untouched nodes are marked >0 together
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! with their neighbours
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!
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icnt = icnt + 1
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naggr = naggr + 1
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ilaggr(i) = naggr
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call psb_neigh(a,i,neigh,n_ne,info,lev=one)
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if (info/=0) then
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info=4010
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ch_err='psb_neigh'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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do k=1, n_ne
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j = neigh(k)
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if ((1<=j).and.(j<=nr)) then
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ilaggr(j) = naggr
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!!$ if (ilaggr(j) < 0) ilaggr(j) = naggr
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!!$ if (ilaggr(j) == -(nr+1)) ilaggr(j) = naggr
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endif
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enddo
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!
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! 2. Untouched neighbours of these nodes are marked <0.
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!
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call psb_neigh(a,i,neigh,n_ne,info,lev=two)
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if (info/=0) then
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info=4010
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ch_err='psb_neigh'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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do n = 1, n_ne
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m = neigh(n)
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if ((1<=m).and.(m<=nr)) then
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if (ilaggr(m) == -(nr+1)) ilaggr(m) = -naggr
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endif
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enddo
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endif
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enddo
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nlp = nlp + 1
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if (icnt == 0) exit
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enddo
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if (debug) then
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write(0,*) 'Check 1:',count(ilaggr == -(nr+1)),(a%ia1(i),i=a%ia2(1),a%ia2(2)-1)
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end if
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!
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! Phase two: sweep over leftovers.
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!
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allocate(ils(naggr+10),stat=info)
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if(info.ne.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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do i=1, size(ils)
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ils(i) = 0
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end do
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do i=1, nr
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n = ilaggr(i)
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if (n>0) then
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if (n>naggr) then
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write(0,*) 'loc_Aggregate: n > naggr 1 ? ',n,naggr
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else
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ils(n) = ils(n) + 1
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end if
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end if
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end do
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if (debug) then
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write(0,*) 'Phase 1: number of aggregates ',naggr
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write(0,*) 'Phase 1: nodes aggregated ',sum(ils)
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end if
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recovery=.false.
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do i=1, nr
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if (ilaggr(i) < 0) then
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!
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! Now some silly rule to break ties:
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! Group with smallest adjacent aggregate.
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!
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isz = nr+1
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ia = -1
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call psb_neigh(a,i,neigh,n_ne,info,lev=one)
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if (info/=0) then
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info=4010
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ch_err='psb_neigh'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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do j=1, n_ne
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k = neigh(j)
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if ((1<=k).and.(k<=nr)) then
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n = ilaggr(k)
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if (n>0) then
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if (n>naggr) then
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write(0,*) 'loc_Aggregate: n > naggr 2? ',n,naggr
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end if
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if (ils(n) < isz) then
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ia = n
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isz = ils(n)
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endif
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endif
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endif
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enddo
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if (ia == -1) then
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if (ilaggr(i) > -(nr+1)) then
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ilaggr(i) = abs(ilaggr(i))
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if (ilaggr(I)>naggr) then
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write(0,*) 'loc_Aggregate: n > naggr 3? ',ilaggr(i),naggr
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end if
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ils(ilaggr(i)) = ils(ilaggr(i)) + 1
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!
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! This might happen if the pattern is non symmetric.
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! Need a better handling.
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!
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recovery = .true.
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else
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write(0,*) 'Unrecoverable error !!',ilaggr(i), nr
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endif
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else
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ilaggr(i) = ia
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if (ia>naggr) then
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write(0,*) 'loc_Aggregate: n > naggr 4? ',ia,naggr
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end if
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ils(ia) = ils(ia) + 1
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endif
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end if
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enddo
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if (recovery) then
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write(0,*) 'Had to recover from strange situation in loc_aggregate.'
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write(0,*) 'Perhaps an unsymmetric pattern?'
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endif
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if (debug) then
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write(0,*) 'Phase 2: number of aggregates ',naggr
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write(0,*) 'Phase 2: nodes aggregated ',sum(ils)
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do i=1, naggr
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write(*,*) 'Size of aggregate ',i,' :',count(ilaggr==i), ils(i)
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enddo
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write(*,*) maxval(ils(1:naggr))
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write(*,*) 'Leftovers ',count(ilaggr<0), ' in ',nlp,' loops'
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end if
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!!$ write(0,*) 'desc_a loc_aggr 4 : ', desc_a%matrix_data(m_)
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if (count(ilaggr<0) >0) then
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write(0,*) 'Fatal error: some leftovers!!!'
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endif
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deallocate(ils,neigh,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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if (nrow /= size(ilaggr)) then
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write(0,*) 'SOmething wrong ilaggr ',nrow,size(ilaggr)
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endif
|
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call psb_realloc(ncol,ilaggr,info)
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if (info/=0) then
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info=4010
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ch_err='psb_realloc'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
|
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allocate(nlaggr(np),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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nlaggr(:) = 0
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nlaggr(me+1) = naggr
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|
call psb_sum(ictxt,nlaggr(1:np))
|
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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 psb_dgenaggrmap
|
