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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
/*
* Test of reduce scatter with large data (needed in MPICH to trigger the
* long-data algorithm)
*
* 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 "mpitest.h"
int main(int argc, char **argv)
{
int errs = 0;
int *sendbuf, *recvbuf;
int size, rank, i, j, idx, mycount, sumval;
MPI_Comm comm;
MTest_Init(&argc, &argv);
comm = MPI_COMM_WORLD;
MPI_Comm_size(comm, &size);
MPI_Comm_rank(comm, &rank);
mycount = (1024 * 1024) / size;
sendbuf = (int *) malloc(mycount * size * sizeof(int));
if (!sendbuf) {
fprintf(stderr, "Could not allocate %d ints for sendbuf\n", mycount * size);
MPI_Abort(MPI_COMM_WORLD, 1);
}
idx = 0;
for (i = 0; i < size; i++) {
for (j = 0; j < mycount; j++) {
sendbuf[idx++] = rank + i;
}
}
recvbuf = (int *) malloc(mycount * sizeof(int));
if (!recvbuf) {
fprintf(stderr, "Could not allocate %d ints for recvbuf\n", mycount);
MPI_Abort(MPI_COMM_WORLD, 1);
}
MPI_Reduce_scatter_block(sendbuf, recvbuf, mycount, MPI_INT, MPI_SUM, comm);
sumval = size * rank + ((size - 1) * size) / 2;
/* recvbuf should be size * (rank + i) */
for (i = 0; i < mycount; i++) {
if (recvbuf[i] != sumval) {
errs++;
if (errs < 10) {
fprintf(stdout, "Did not get expected value for reduce scatter\n");
fprintf(stdout, "[%d] Got %d expected %d\n", rank, recvbuf[i], sumval);
}
}
}
MPI_Reduce_scatter_block(MPI_IN_PLACE, sendbuf, mycount, MPI_INT, MPI_SUM, comm);
sumval = size * rank + ((size - 1) * size) / 2;
/* recv'ed values for my process should be size * (rank + i) */
for (i = 0; i < mycount; i++) {
if (sendbuf[i] != sumval) {
errs++;
if (errs < 10) {
fprintf(stdout, "Did not get expected value for reduce scatter (in place)\n");
fprintf(stdout, "[%d] Got %d expected %d\n", rank, sendbuf[i], sumval);
}
}
}
free(sendbuf);
free(recvbuf);
MTest_Finalize(errs);
return MTestReturnValue(errs);
}
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