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C
C Copyright (C) by Argonne National Laboratory
C See COPYRIGHT in top-level directory
C
program main
implicit none
include 'mpif.h'
integer ierr, errs
integer i, ans, size, rank, color, comm, newcomm
integer maxSize, displ
parameter (maxSize=128)
integer scounts(maxSize), sdispls(maxSize), stypes(maxSize)
integer rcounts(maxSize), rdispls(maxSize), rtypes(maxSize)
integer sbuf(maxSize), rbuf(maxSize)
errs = 0
call mtest_init( ierr )
C Get a comm
call mpi_comm_dup( MPI_COMM_WORLD, comm, ierr )
call mpi_comm_size( comm, size, ierr )
if (size .gt. maxSize) then
call mpi_comm_rank( comm, rank, ierr )
color = 1
if (rank .lt. maxSize) color = 0
call mpi_comm_split( comm, color, rank, newcomm, ierr )
call mpi_comm_free( comm, ierr )
comm = newcomm
call mpi_comm_size( comm, size, ierr )
endif
call mpi_comm_rank( comm, rank, ierr )
C
if (size .le. maxSize) then
C Initialize the data. Just use this as an all to all
C Use the same test as alltoallwf.c , except displacements are in units of
C integers instead of bytes
do i=1, size
scounts(i) = 1
sdispls(i) = (i-1)
stypes(i) = MPI_INTEGER
sbuf(i) = rank * size + i
rcounts(i) = 1
rdispls(i) = (i-1)
rtypes(i) = MPI_INTEGER
rbuf(i) = -1
enddo
call mpi_alltoallv( sbuf, scounts, sdispls, stypes,
& rbuf, rcounts, rdispls, rtypes, comm, ierr )
C
C check rbuf(i) = data from the ith location of the ith send buf, or
C rbuf(i) = (i-1) * size + i
do i=1, size
ans = (i-1) * size + rank + 1
if (rbuf(i) .ne. ans) then
errs = errs + 1
print *, rank, ' rbuf(', i, ') = ', rbuf(i),
& ' expected ', ans
endif
enddo
C
C A halo-exchange example - mostly zero counts
C
do i=1, size
scounts(i) = 0
sdispls(i) = 0
stypes(i) = MPI_INTEGER
sbuf(i) = -1
rcounts(i) = 0
rdispls(i) = 0
rtypes(i) = MPI_INTEGER
rbuf(i) = -1
enddo
C
C Note that the arrays are 1-origin
displ = 0
if (rank .gt. 0) then
scounts(1+rank-1) = 1
rcounts(1+rank-1) = 1
sdispls(1+rank-1) = displ
rdispls(1+rank-1) = rank - 1
sbuf(1+displ) = rank
displ = displ + 1
endif
scounts(1+rank) = 1
rcounts(1+rank) = 1
sdispls(1+rank) = displ
rdispls(1+rank) = rank
sbuf(1+displ) = rank
displ = displ + 1
if (rank .lt. size-1) then
scounts(1+rank+1) = 1
rcounts(1+rank+1) = 1
sdispls(1+rank+1) = displ
rdispls(1+rank+1) = rank+1
sbuf(1+displ) = rank
displ = displ + 1
endif
call mpi_alltoallv( sbuf, scounts, sdispls, stypes,
& rbuf, rcounts, rdispls, rtypes, comm, ierr )
C
C Check the neighbor values are correctly moved
C
if (rank .gt. 0) then
if (rbuf(1+rank-1) .ne. rank-1) then
errs = errs + 1
print *, rank, ' rbuf(',1+rank-1, ') = ', rbuf(1+rank-1),
& 'expected ', rank-1
endif
endif
if (rbuf(1+rank) .ne. rank) then
errs = errs + 1
print *, rank, ' rbuf(', 1+rank, ') = ', rbuf(1+rank),
& 'expected ', rank
endif
if (rank .lt. size-1) then
if (rbuf(1+rank+1) .ne. rank+1) then
errs = errs + 1
print *, rank, ' rbuf(', 1+rank+1, ') = ',rbuf(1+rank+1),
& 'expected ', rank+1
endif
endif
do i=0,rank-2
if (rbuf(1+i) .ne. -1) then
errs = errs + 1
print *, rank, ' rbuf(', 1+i, ') = ', rbuf(1+i),
& 'expected -1'
endif
enddo
do i=rank+2,size-1
if (rbuf(1+i) .ne. -1) then
errs = errs + 1
print *, rank, ' rbuf(', i, ') = ', rbuf(1+i),
& 'expected -1'
endif
enddo
endif
call mpi_comm_free( comm, ierr )
call mtest_finalize( errs )
end
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