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342 lines
12 KiB
Fortran
342 lines
12 KiB
Fortran
!!$
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!!$ Parallel Sparse BLAS version 2.2
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!!$ (C) Copyright 2006/2007/2008
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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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!!$
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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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!
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!
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! File: psi_desc_index.f90
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!
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! Subroutine: psi_desc_index
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! Converts a list of data exchanges from build format to assembled format.
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! See below for a description of the formats.
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!
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! Arguments:
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! desc_a - type(psb_desc_type) The descriptor; in this context only the index
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! mapping parts are used.
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! index_in(:) - integer The index list, build format
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! index_out(:) - integer, allocatable The index list, assembled format
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! glob_idx - logical Whether the input indices are in local or global
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! numbering; the global numbering is used when
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! converting the overlap exchange lists.
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! nxch - integer The number of data exchanges on the calling process
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! nsnd - integer Total send buffer size on the calling process
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! nrcv - integer Total receive buffer size on the calling process
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!
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! The format of the index lists. Copied from base/modules/psb_desc_type
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!
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! 7. The data exchange is based on lists of local indices to be exchanged; all the
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! lists have the same format, as follows:
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! the list is composed of variable dimension blocks, one for each process to
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! communicate with; each block contains indices of local elements to be
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! exchanged. We do choose the order of communications: do not change
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! the sequence of blocks unless you know what you're doing, or you'll
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! risk a deadlock. NOTE: This is the format when the state is PSB_ASB_.
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! See below for BLD. The end-of-list is marked with a -1.
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!
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! notation stored in explanation
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! --------------- --------------------------- -----------------------------------
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! process_id index_v(p+proc_id_) identifier of process with which
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! data is exchanged.
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! n_elements_recv index_v(p+n_elem_recv_) number of elements to receive.
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! elements_recv index_v(p+elem_recv_+i) indexes of local elements to
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! receive. these are stored in the
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! array from location p+elem_recv_ to
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! location p+elem_recv_+
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! index_v(p+n_elem_recv_)-1.
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! n_elements_send index_v(p+n_elem_send_) number of elements to send.
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! elements_send index_v(p+elem_send_+i) indexes of local elements to
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! send. these are stored in the
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! array from location p+elem_send_ to
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! location p+elem_send_+
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! index_v(p+n_elem_send_)-1.
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!
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! This organization is valid for both halo and overlap indices; overlap entries
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! need to be updated to ensure that a variable at a given global index
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! (assigned to multiple processes) has the same value. The way to resolve the
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! issue is to exchange the data and then sum (or average) the values. See
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! psb_ovrl subroutine.
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!
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! 8. When the descriptor is in the BLD state the INDEX vectors contains only
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! the indices to be received, organized as a sequence
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! of entries of the form (proc,N,(lx1,lx2,...,lxn)) with owning process,
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! number of indices (most often N=1), list of local indices.
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! This is because we only know the list of halo indices to be received
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! as we go about building the sparse matrix pattern, and we want the build
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! phase to be loosely synchronized. Thus we record the indices we have to ask
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! for, and at the time we call PSB_CDASB we match all the requests to figure
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! out who should be sending what to whom.
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! However this implies that we know who owns the indices; if we are in the
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! LARGE case (as described above) this is actually only true for the OVERLAP list
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! that is filled in at CDALL time, and not for the HALO; thus the HALO list
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! is rebuilt during the CDASB process (in the psi_ldsc_pre_halo subroutine).
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!
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!
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subroutine psi_desc_index(desc,index_in,dep_list,&
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& length_dl,nsnd,nrcv,desc_index,isglob_in,info)
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use psb_descriptor_type
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use psb_realloc_mod
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use psb_error_mod
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use psb_const_mod
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#ifdef MPI_MOD
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use mpi
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#endif
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use psb_penv_mod
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use psi_mod, psb_protect_name => psi_desc_index
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implicit none
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#ifdef MPI_H
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include 'mpif.h'
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#endif
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! ...array parameters.....
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type(psb_desc_type) :: desc
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integer :: index_in(:),dep_list(:)
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integer,allocatable :: desc_index(:)
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integer :: length_dl,nsnd,nrcv,info
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logical :: isglob_in
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! ....local scalars...
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integer :: j,me,np,i,proc
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! ...parameters...
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integer :: ictxt
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integer, parameter :: no_comm=-1
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! ...local arrays..
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integer,allocatable :: brvindx(:),rvsz(:),&
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& bsdindx(:),sdsz(:), sndbuf(:), rcvbuf(:)
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integer :: ihinsz,ntot,k,err_act,nidx,&
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& idxr, idxs, iszs, iszr, nesd, nerv, icomm
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logical,parameter :: usempi=.true.
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integer :: debug_level, debug_unit
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character(len=20) :: name
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info = psb_success_
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name='psi_desc_index'
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call psb_erractionsave(err_act)
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debug_unit = psb_get_debug_unit()
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debug_level = psb_get_debug_level()
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ictxt = psb_cd_get_context(desc)
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icomm = psb_cd_get_mpic(desc)
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call psb_info(ictxt,me,np)
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if (np == -1) then
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info = psb_err_blacs_error_
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call psb_errpush(info,name)
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goto 9999
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endif
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if (debug_level >= psb_debug_inner_) then
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write(debug_unit,*) me,' ',trim(name),': start'
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call psb_barrier(ictxt)
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endif
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!
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! first, find out the sizes to be exchanged.
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! note: things marked here as sndbuf/rcvbuf (for mpi) corresponds to things
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! to be received/sent (in the final psblas descriptor).
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! be careful of the inversion
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!
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allocate(sdsz(np),rvsz(np),bsdindx(np),brvindx(np),stat=info)
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if(info /= psb_success_) then
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info=psb_err_alloc_dealloc_
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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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sdsz(:) = 0
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rvsz(:) = 0
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bsdindx(:) = 0
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brvindx(:) = 0
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i = 1
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do
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if (index_in(i) == -1) exit
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proc = index_in(i)
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i = i + 1
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nerv = index_in(i)
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sdsz(proc+1) = sdsz(proc+1) + nerv
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i = i + nerv + 1
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end do
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ihinsz=i
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call mpi_alltoall(sdsz,1,mpi_integer,rvsz,1,mpi_integer,icomm,info)
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if(info /= psb_success_) then
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call psb_errpush(psb_err_from_subroutine_,name,a_err='mpi_alltoall')
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goto 9999
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end if
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i = 1
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idxs = 0
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idxr = 0
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do i=1, length_dl
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proc = dep_list(i)
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bsdindx(proc+1) = idxs
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idxs = idxs + sdsz(proc+1)
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brvindx(proc+1) = idxr
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idxr = idxr + rvsz(proc+1)
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end do
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iszs = sum(sdsz)
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iszr = sum(rvsz)
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nsnd = iszr
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nrcv = iszs
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if ((iszs /= idxs).or.(iszr /= idxr)) then
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write(0,*) me, trim(name),': Warning: strange results?', &
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& iszs,idxs,iszr,idxr
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end if
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if (debug_level >= psb_debug_inner_) then
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write(debug_unit,*) me,' ',trim(name),': computed sizes ',iszr,iszs
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call psb_barrier(ictxt)
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endif
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ntot = (3*(count((sdsz>0).or.(rvsz>0)))+ iszs + iszr) + 1
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if (ntot > psb_size(desc_index)) then
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call psb_realloc(ntot,desc_index,info)
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endif
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!!$ call psb_ensure_size(ntot,desc_index,info)
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if (info /= psb_success_) then
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call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_realloc')
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goto 9999
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end if
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if (debug_level >= psb_debug_inner_) then
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write(debug_unit,*) me,' ',trim(name),': computed allocated workspace ',iszr,iszs
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call psb_barrier(ictxt)
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endif
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allocate(sndbuf(iszs),rcvbuf(iszr),stat=info)
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if(info /= psb_success_) then
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info=psb_err_alloc_dealloc_
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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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!
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! Second build the lists of requests
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!
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i = 1
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do
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if (i > ihinsz) then
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!!$ write(0,*) me,' did not find index_in end??? ',i,ihinsz
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exit
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end if
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if (index_in(i) == -1) exit
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proc = index_in(i)
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i = i + 1
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nerv = index_in(i)
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!
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! note that here bsdinx is zero-based, hence the following loop
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!
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if (isglob_in) then
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do j=1, nerv
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sndbuf(bsdindx(proc+1)+j) = (index_in(i+j))
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end do
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else
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call psb_map_l2g(index_in(i+1:i+nerv),&
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& sndbuf(bsdindx(proc+1)+1:bsdindx(proc+1)+nerv),&
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& desc%idxmap,info)
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if (info /= psb_success_) then
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call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_map_l2g')
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goto 9999
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end if
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endif
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bsdindx(proc+1) = bsdindx(proc+1) + nerv
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i = i + nerv + 1
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end do
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if (debug_level >= psb_debug_inner_) then
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write(debug_unit,*) me,' ',trim(name),': prepared send buffer '
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call psb_barrier(ictxt)
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endif
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!
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! now have to regenerate bsdindx
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!
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idxs = 0
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idxr = 0
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do i=1, length_dl
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proc = dep_list(i)
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bsdindx(proc+1) = idxs
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idxs = idxs + sdsz(proc+1)
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brvindx(proc+1) = idxr
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idxr = idxr + rvsz(proc+1)
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end do
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call mpi_alltoallv(sndbuf,sdsz,bsdindx,mpi_integer,&
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& rcvbuf,rvsz,brvindx,mpi_integer,icomm,info)
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if(info /= psb_success_) then
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call psb_errpush(psb_err_from_subroutine_,name,a_err='mpi_alltoallv')
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goto 9999
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end if
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!
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! at this point we can finally build the output desc_index. beware
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! of snd/rcv inversion.
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!
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i = 1
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do k = 1, length_dl
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proc = dep_list(k)
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desc_index(i) = proc
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i = i + 1
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nerv = sdsz(proc+1)
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desc_index(i) = nerv
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call psi_idx_cnv(nerv,sndbuf(bsdindx(proc+1)+1:bsdindx(proc+1)+nerv),&
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& desc_index(i+1:i+nerv),desc,info)
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i = i + nerv + 1
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nesd = rvsz(proc+1)
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desc_index(i) = nesd
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call psi_idx_cnv(nesd,rcvbuf(brvindx(proc+1)+1:brvindx(proc+1)+nesd),&
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& desc_index(i+1:i+nesd),desc,info)
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i = i + nesd + 1
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end do
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desc_index(i) = - 1
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deallocate(sdsz,rvsz,bsdindx,brvindx,sndbuf,rcvbuf,stat=info)
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if (info /= psb_success_) then
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info=psb_err_alloc_dealloc_
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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 (debug_level >= psb_debug_inner_) then
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write(debug_unit,*) me,' ',trim(name),': done'
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call psb_barrier(ictxt)
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endif
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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 == psb_act_abort_) then
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call psb_error(ictxt)
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return
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end if
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return
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end subroutine psi_desc_index
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