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!
! Copyright (C) by Argonne National Laboratory
! See COPYRIGHT in top-level directory
!
! This file created from test/mpi/f77/coll/alltoallvf.f with f77tof90
program main
use mpi_f08
integer ierr, errs
integer i, ans, size, rank, color
TYPE(MPI_Comm) comm, newcomm
integer maxSize, displ
parameter (maxSize=128)
integer scounts(maxSize), sdispls(maxSize)
integer rcounts(maxSize), rdispls(maxSize)
TYPE(MPI_Datatype) stype, rtype
integer sbuf(maxSize), rbuf(maxSize)
errs = 0
call mtest_init( ierr )
! 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 )
!
if (size .le. maxSize) then
! Initialize the data. Just use this as an all to all
! Use the same test as alltoallwf.c , except displacements are in units of
! integers instead of bytes
do i=1, size
scounts(i) = 1
sdispls(i) = (i-1)
stype = MPI_INTEGER
sbuf(i) = rank * size + i
rcounts(i) = 1
rdispls(i) = (i-1)
rtype = MPI_INTEGER
rbuf(i) = -1
enddo
call mpi_alltoallv( sbuf, scounts, sdispls, stype, &
& rbuf, rcounts, rdispls, rtype, comm, ierr )
!
! check rbuf(i) = data from the ith location of the ith send buf, or
! 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
!
! A halo-exchange example - mostly zero counts
!
do i=1, size
scounts(i) = 0
sdispls(i) = 0
stype = MPI_INTEGER
sbuf(i) = -1
rcounts(i) = 0
rdispls(i) = 0
rtype = MPI_INTEGER
rbuf(i) = -1
enddo
!
! 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, stype, &
& rbuf, rcounts, rdispls, rtype, comm, ierr )
!
! Check the neighbor values are correctly moved
!
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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