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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
/*
* Test of reduce scatter.
*
* Each processor contributes its rank + the index to the reduction,
* then receives the ith sum
*
* Can be called with any number of processors.
*/
#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>
#include "mpicolltest.h"
#include "mpitest.h"
int main(int argc, char **argv)
{
int err = 0;
int *sendbuf, recvbuf, *recvcounts;
int size, rank, i, sumval;
MPI_Comm comm;
MTest_Init(&argc, &argv);
comm = MPI_COMM_WORLD;
MPI_Comm_size(comm, &size);
MPI_Comm_rank(comm, &rank);
sendbuf = (int *) malloc(size * sizeof(int));
for (i = 0; i < size; i++)
sendbuf[i] = rank + i;
recvcounts = (int *) malloc(size * sizeof(int));
for (i = 0; i < size; i++)
recvcounts[i] = 1;
MTest_Reduce_scatter(sendbuf, &recvbuf, recvcounts, MPI_INT, MPI_SUM, comm);
sumval = size * rank + ((size - 1) * size) / 2;
/* recvbuf should be size * (rank + i) */
if (recvbuf != sumval) {
err++;
fprintf(stdout, "Did not get expected value for reduce scatter\n");
fprintf(stdout, "[%d] Got %d expected %d\n", rank, recvbuf, sumval);
}
free(sendbuf);
free(recvcounts);
MTest_Finalize(err);
return MTestReturnValue(err);
}
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