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! This file created from f77/coll/red_scat_blockf.f with f77tof90
! -*- Mode: Fortran; -*-
!
! (C) 2012 by Argonne National Laboratory.
! See COPYRIGHT in top-level directory.
!
! A simple test for Fortran support of Reduce_scatter_block
! with or withoutMPI_IN_PLACE.
!
program main
use mpi
integer MAX_SIZE
parameter (MAX_SIZE=1024)
integer sbuf(MAX_SIZE), rbuf(MAX_SIZE)
integer comm, rank, size
integer sumval, ierr, errs, i
errs = 0
call mtest_init( ierr )
comm = MPI_COMM_WORLD
call mpi_comm_rank( comm, rank, ierr )
call mpi_comm_size( comm, size, ierr )
do i = 1, size
sbuf(i) = rank + (i-1)
enddo
call MPI_Reduce_scatter_block(sbuf, rbuf, 1, MPI_INTEGER, &
& MPI_SUM, comm, ierr)
sumval = size * rank + ((size-1) * size)/2
if ( rbuf(1) .ne. sumval ) then
errs = errs + 1
print *, 'Reduce_scatter_block does not get expected value.'
print *, '[', rank, ']', 'Got ', rbuf(1), ' but expected ', &
& sumval, '.'
endif
! Try MPI_IN_PLACE
do i = 1, size
rbuf(i) = rank + (i-1)
enddo
call MPI_Reduce_scatter_block(MPI_IN_PLACE, rbuf, 1, MPI_INTEGER, &
& MPI_SUM, comm, ierr)
if ( rbuf(1) .ne. sumval ) then
errs = errs + 1
print *, 'Reduce_scatter_block does not get expected value.'
print *, '[', rank, ']', 'Got ', rbuf(1), ' but expected ', &
& sumval, '.'
endif
call mtest_finalize( errs )
end
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