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psblas3/base/internals/psi_graph_fnd_owner.F90

409 lines
15 KiB
Fortran

!
! Parallel Sparse BLAS version 3.5
! (C) Copyright 2006-2018
! Salvatore Filippone
! Alfredo Buttari
!
! 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 PSBLAS group or the names of its contributors may
! 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 PSBLAS GROUP OR ITS CONTRIBUTORS
! 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: psi_graph_fnd_owner.f90
!
! Subroutine: psi_graph_fnd_owner
! Figure out who owns global indices.
!
! Arguments:
! idx(:) - integer Required indices on the calling process.
!
! iprc(:) - integer(psb_ipk_), allocatable Output: process identifiers
! for the corresponding indices
! idxmap - class(psb_indx_map). The index map
! info - integer. return code.
!
! This is the method to find out who owns a set of indices.
! In principle we could do the following:
! 1. Do an allgatherv of IDX
! 2. For each of the collected indices figure out if current proces owns it
! 3. Scatter the results
! 4. Loop through the answers
! This method is guaranteed to find the owner, unless an input index has
! an invalid value, however it could easily require too much additional space
! because each block of indices is replicated to all processes.
! Therefore the current routine takes a different approach:
! -1. Figure out a maximum size for a buffer to collect the IDX; the buffer
! should allow for at least one index from each process (i.e. min size NP); also
! check if we have an adjacency list of processes on input;
! 0. If the initial adjacency list is not empty, use psi_adj_fnd_sweep to go
! through all indices and use multiple calls to psi_adjcncy_fnd_owner
! (up to the buffer size) to see if the owning processes are in the
! initial neighbours list;
! 1. Extract a sample from IDX, up to the buffer size, and do a call
! to psi_a2a_fnd_owner. This is guaranteed to find the owners of all indices
! in the sample;
! 2. Build the list of processes that own the sample indices; these are
! (a subset of) the topological neighbours, and store the list in IDXMAP
! 3. Use psi_adj_fnd_sweep to go through all remaining indices and use
! multiple calls to psi_adjcncy_fnd_owner (up to the buffer size)
! to see if the owning processes are in the current neighbours list;
! 4. If the input indices IDX have not been exhausted, cycle to 1.
!
! Thus, we are alternating between asking all processes for a subset of indices,
! and asking a subset of processes for all the indices,
! thereby limiting the memory footprint to a predefined maximum
! (that the user can force with psb_cd_set_maxspace()).
!
subroutine psi_graph_fnd_owner(idx,iprc,idxmap,info)
use psb_serial_mod
use psb_const_mod
use psb_error_mod
use psb_penv_mod
use psb_realloc_mod
use psb_timers_mod
use psb_desc_mod, psb_protect_name => psi_graph_fnd_owner
#ifdef MPI_MOD
use mpi
#endif
implicit none
#ifdef MPI_H
include 'mpif.h'
#endif
integer(psb_lpk_), intent(in) :: idx(:)
integer(psb_ipk_), allocatable, intent(out) :: iprc(:)
class(psb_indx_map), intent(inout) :: idxmap
integer(psb_ipk_), intent(out) :: info
integer(psb_lpk_), allocatable :: tidx(:)
integer(psb_ipk_), allocatable :: tprc(:), tsmpl(:), ladj(:)
integer(psb_mpk_) :: icomm, minfo
integer(psb_ipk_) :: i,n_row,n_col,err_act,ip,j, nsampl_out,&
& nv, n_answers, nqries, nsampl_in, locr_max, ist, iend,&
& nqries_max, nadj, maxspace, mxnsin, mnnsin, nsampl, nlansw
integer(psb_lpk_) :: mglob, ih
type(psb_ctxt_type) :: ctxt
integer(psb_ipk_) :: np,me, nresp
integer(psb_ipk_), parameter :: nt=4
integer(psb_ipk_) :: tmpv(4)
logical, parameter :: do_timings=.false., trace=.false., debugsz=.false.
integer(psb_ipk_), save :: idx_sweep0=-1, idx_loop_a2a=-1, idx_loop_neigh=-1
real(psb_dpk_) :: t0, t1, t2, t3, t4
character(len=20) :: name
info = psb_success_
name = 'psi_graph_fnd_owner'
call psb_erractionsave(err_act)
ctxt = idxmap%get_ctxt()
icomm = idxmap%get_mpic()
mglob = idxmap%get_gr()
n_row = idxmap%get_lr()
n_col = idxmap%get_lc()
if ((do_timings).and.(idx_sweep0==-1)) &
& idx_sweep0 = psb_get_timer_idx("GRPH_FND_OWN: Outer sweep")
if ((do_timings).and.(idx_loop_a2a==-1)) &
& idx_loop_a2a = psb_get_timer_idx("GRPH_FND_OWN: Loop a2a")
if ((do_timings).and.(idx_loop_neigh==-1)) &
& idx_loop_neigh = psb_get_timer_idx("GRPH_FND_OWN: Loop neigh")
call psb_info(ctxt, me, np)
if (np == -1) then
info = psb_err_context_error_
call psb_errpush(info,name)
goto 9999
endif
if (.not.(idxmap%is_valid())) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='invalid idxmap')
goto 9999
end if
!
!
!
nv = size(idx)
call psb_realloc(nv,iprc,info)
if (info == psb_success_) call psb_realloc(nv,tidx,info)
if (info == psb_success_) call psb_realloc(nv,tprc,info)
if (info == psb_success_) call psb_realloc(nv,tsmpl,info)
if (info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_realloc')
goto 9999
end if
iprc(:) = -1
!
! Start from the adjacncy list
!
call psb_safe_ab_cpy(idxmap%p_adjcncy,ladj,info)
nadj = psb_size(ladj)
! This makes ladj allocated with size 0 if needed, as opposed to unallocated
call psb_realloc(nadj,ladj,info)
!
! Throughout the subroutine, nqries is the number of local inquiries
! that have not been answered yet, n_answers is the number of queries
! that have been resolved. The queries/answers may be scattered
! through idx/iprc
!
n_answers = 0
nqries = nv - n_answers
nqries_max = nqries
!
! Choice of maxspace should be adjusted to account for a default
! "sensible" size and/or a user-specified value
! Currently:
! 1. Use psb_cd_get_max_space()
! 2. If nt*locr_max > maxspace, use nt_loc_max
! 3. Should be at least NP
!
tmpv(1) = nadj
tmpv(2) = nqries_max
tmpv(3) = n_row
tmpv(4) = psb_cd_get_maxspace()
call psb_max(ctxt,tmpv)
nqries_max = tmpv(2)
locr_max = tmpv(3)
maxspace = nt*locr_max
if (tmpv(4) > nt*locr_max) maxspace = tmpv(4)
maxspace = max(maxspace,np)
if (trace.and.(me == 0)) write(0,*) ' Through graph_fnd_owner with maxspace:',&
& maxspace, maxspace/np, nt*locr_max, psb_cd_get_maxspace()
if (do_timings) call psb_tic(idx_sweep0)
if ((tmpv(1) > 0).and.(tmpv(2) >0)) then
!
! Do a preliminary run on the user-defined adjacency lists
!
if (debugsz) write(0,*) me,' Initial sweep on user-defined topology',nqries
nsampl_in = min(nqries,max(1,(maxspace+max(1,nadj)-1))/(max(1,nadj)))
if (trace.and.(me == 0)) write(0,*) ' Initial sweep on user-defined topology',&
& nsampl_in
call psi_adj_fnd_sweep(idx,iprc,ladj,idxmap,nsampl_in,n_answers)
call idxmap%xtnd_p_adjcncy(ladj)
nqries = nv - n_answers
nqries_max = nqries
call psb_max(ctxt,nqries_max)
if (trace.and.(me == 0)) write(0,*) ' After initial sweep:',nqries_max
if (debugsz) write(0,*) me,' After sweep on user-defined topology',nqries_max
end if
if (do_timings) call psb_toc(idx_sweep0)
fnd_owner_loop: do while (nqries_max>0)
if (do_timings) call psb_tic(idx_loop_a2a)
if (debugsz) write(0,*) me,' fnd_owner_loop',nqries_max
!
! The basic idea of this loop is to alternate between
! searching through all processes and searching
! in the neighbourood.
!
! 1. Select a sample such that the total size is <= maxspace
! sample query is then sent to all processes
!
if (trace.and.(me == 0)) write(0,*) 'Looping in graph_fnd_owner: ', nqries_max
nsampl_in = nqries
nsampl_in = min(max(1,(maxspace+np-1)/np),nsampl_in)
!
! Choose a sample, should it be done in this simplistic way?
! Note: nsampl_in is a hint, not an absolute, hence nsampl_out
!
call psi_get_sample(1,idx,iprc,tidx,tsmpl,iend,nsampl_in,nsampl_out)
nsampl = min(nsampl_out,nsampl_in)
if (debugsz) write(0,*) me,' From first sampling ',nsampl_in
!
! 2. Do a search on all processes; this is supposed to find
! the owning process for all inputs;
!
call psi_a2a_fnd_owner(tidx(1:nsampl),tprc,idxmap,info)
if (debugsz) write(0,*) me,' From a2a_fnd_owner ',info
call psi_cpy_out(iprc,tprc,tsmpl,nsampl,nlansw)
if (nlansw < nsampl) then
write(0,*) me,'Warning: indices not found by a2a_fnd_owner ',nlansw,nsampl
end if
n_answers = n_answers + nlansw
nqries = nv - n_answers
!
! 3. Extract the resulting adjacency list and add it to the
! indxmap;
!
ladj = tprc(1:nlansw)
call psb_msort_unique(ladj,nadj)
call psb_realloc(nadj,ladj,info)
call idxmap%xtnd_p_adjcncy(ladj)
if (do_timings) call psb_toc(idx_loop_a2a)
if (do_timings) call psb_tic(idx_loop_neigh)
!
! 4. Do a complete sweep over the queries using
! the adjacency list just computed.
! Rationale:
! 1. Only ask to the neighbours; any missing entries
! will eventually be found by the a2a step;
! 2. Only use the adjacency list just recomputed: any
! currently open queries have already been tested
! on previous adjacency lists, no need to try them again.
!
if (trace.and.(me == 0)) write(0,*) ' Further sweep',nsampl_in, mxnsin, mnnsin
if (mxnsin>0) call psi_adj_fnd_sweep(idx,iprc,ladj,&
& idxmap,nsampl_in,n_answers)
nqries = nv - n_answers
nqries_max = nqries
call psb_max(ctxt,nqries_max)
if (trace.and.(me == 0)) write(0,*) ' fnd_owner_loop remaining:',nqries_max
if (do_timings) call psb_toc(idx_loop_neigh)
end do fnd_owner_loop
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(ctxt,err_act)
return
contains
!
! Get a sample.
! 1. Start from entry istart;
! 2. Collect unanswered queries
! 3. Up to ns_in sample size;
! 4. Record the actual sample size;
! 5. Record where the sample stopped in case
! you need to complete a sweep through the data
! 6. For each query, record where in the original vector
! it came from;
! 7. There could be scattered answered/unanswered queries,
! so the code needs to skip existing answers; hence, the
! number of items sampled and the index where it stops
! differ.
!
!
subroutine psi_get_sample(istart,idx,iprc,tidx,tsmpl,iend,ns_in,ns_out)
implicit none
integer(psb_lpk_), intent(in) :: idx(:)
integer(psb_ipk_), intent(in) :: ns_in, iprc(:),istart
integer(psb_lpk_), intent(out) :: tidx(:)
integer(psb_ipk_), intent(out) :: tsmpl(:), ns_out,iend
!
integer(psb_ipk_) :: nv, ns, k, ipnt
nv = size(idx)
ns = ns_in
!
! ns_in == 0 means that on the outside we figure there's
! nothing left, but we need to do something because the adj_sweep is
! sinchronized
! Make sure we sweep through the entire vector immediately.
! But also make sure we do not overrun tsmpl
!
ns = min(ns,size(tsmpl))
ns_out = 0
ipnt = istart-1
do while(ipnt<nv)
ipnt = ipnt+1
if (iprc(ipnt) == -1) then
ns_out = ns_out + 1
tsmpl(ns_out) = ipnt
tidx(ns_out) = idx(ipnt)
end if
if (ns_out >= ns) exit
end do
iend = ipnt
end subroutine psi_get_sample
subroutine psi_cpy_out(iprc,tprc,tsmpl,ns_in,ns_out)
implicit none
integer(psb_ipk_), intent(out) :: iprc(:)
integer(psb_ipk_), intent(in) :: ns_in
integer(psb_ipk_), intent(in) :: tprc(:), tsmpl(:)
integer(psb_ipk_), intent(out) :: ns_out
integer(psb_ipk_) :: j
ns_out = 0
do j=1, ns_in
if (tprc(j) /= -1) then
ns_out = ns_out + 1
iprc(tsmpl(j)) = tprc(j)
end if
end do
end subroutine psi_cpy_out
subroutine psi_adj_fnd_sweep(idx,iprc,adj,idxmap,n_samples,n_answers)
implicit none
integer(psb_lpk_), intent(in) :: idx(:)
integer(psb_ipk_), intent(in) :: n_samples
integer(psb_ipk_), intent(inout) :: iprc(:), n_answers
integer(psb_ipk_), intent(in) :: adj(:)
class(psb_indx_map), intent(inout) :: idxmap
!
type(psb_ctxt_type) :: ctxt
integer(psb_ipk_) :: ipnt, ns_in, ns_out, n_rem, me, np, isw, n_reml,iend, nv
integer(psb_lpk_), allocatable :: tidx(:)
integer(psb_ipk_), allocatable :: tsmpl(:)
ctxt = idxmap%get_ctxt()
call psb_info(ctxt,me,np)
call psb_realloc(n_samples,tidx,info)
call psb_realloc(n_samples,tsmpl,info)
ipnt = 1
isw = 1
nv = size(idx)
do
! Sweep through the vector, one section at a time,
! up to N_SAMPLES samples. The sections are unpredictable, because
! the queries are scattered; hence the need for get_sample
! to tell us where the current section ends
!
call psi_get_sample(ipnt,idx,iprc,tidx,tsmpl,iend,n_samples,ns_out)
ns_in = min(n_samples,ns_out)
!
call psi_adjcncy_fnd_owner(tidx(1:ns_in),tprc,ladj,idxmap,info)
call psi_cpy_out(iprc,tprc,tsmpl,ns_in,ns_out)
!
! Update starting point of next sweep and number of remaining
! queries to check for end of loop.
!
n_answers = n_answers + ns_out
ipnt = iend + 1
n_reml = nv - ipnt + 1
n_rem = n_reml
call psb_max(ctxt,n_rem)
! if (me == 0) write(0,*) me,' fnd_sweep Sweep ',isw,n_rem, ipnt, n_samples, n_reml
isw = isw + 1
if (n_rem <= 0) exit
end do
! if (me == 0) write(0,*)'adj_fnd_sweep: sweeps: ',isw
end subroutine psi_adj_fnd_sweep
end subroutine psi_graph_fnd_owner