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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
*
* (C) 2003 by Argonne National Laboratory.
* See COPYRIGHT in top-level directory.
*/
#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>
#include "mpitest.h"
#include "mpicolltest.h"
/*
static char MTEST_Descrip[] = "Simple intercomm allreduce test";
*/
int main(int argc, char *argv[])
{
int errs = 0, err;
int *sendbuf = 0, *recvbuf = 0;
int leftGroup, i, count, rank, rsize;
MPI_Comm comm;
MPI_Datatype datatype;
MTest_Init(&argc, &argv);
datatype = MPI_INT;
/* Get an intercommunicator */
while (MTestGetIntercomm(&comm, &leftGroup, 4)) {
if (comm == MPI_COMM_NULL)
continue;
MPI_Comm_rank(comm, &rank);
MPI_Comm_remote_size(comm, &rsize);
/* To improve reporting of problems about operations, we
* change the error handler to errors return */
MPI_Errhandler_set(comm, MPI_ERRORS_RETURN);
for (count = 1; count < 65000; count = 2 * count) {
/* printf("rank = %d(%d)\n", rank, leftGroup); fflush(stdout); */
sendbuf = (int *) malloc(count * sizeof(int));
recvbuf = (int *) malloc(count * sizeof(int));
if (leftGroup) {
for (i = 0; i < count; i++)
sendbuf[i] = i;
} else {
for (i = 0; i < count; i++)
sendbuf[i] = -i;
}
for (i = 0; i < count; i++)
recvbuf[i] = 0;
err = MTest_Allreduce(sendbuf, recvbuf, count, datatype, MPI_SUM, comm);
if (err) {
errs++;
MTestPrintError(err);
}
/* In each process should be the sum of the values from the
* other process */
if (leftGroup) {
for (i = 0; i < count; i++) {
if (recvbuf[i] != -i * rsize) {
errs++;
if (errs < 10) {
fprintf(stderr, "recvbuf[%d] = %d\n", i, recvbuf[i]);
}
}
}
} else {
for (i = 0; i < count; i++) {
if (recvbuf[i] != i * rsize) {
errs++;
if (errs < 10) {
fprintf(stderr, "recvbuf[%d] = %d\n", i, recvbuf[i]);
}
}
}
}
free(sendbuf);
free(recvbuf);
}
MTestFreeComm(&comm);
}
MTest_Finalize(errs);
return MTestReturnValue(errs);
}
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