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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>
#include "mpitest.h"
/*
* User-defined operation on a long value (tests proper handling of
* possible pipelining in the implementation of reductions with user-defined
* operations).
*/
static void add(double *invec, double *inoutvec, int *len, MPI_Datatype * dtype)
{
int i, n = *len;
for (i = 0; i < n; i++) {
inoutvec[i] = invec[i] + inoutvec[i];
}
}
int main(int argc, char **argv)
{
MPI_Op op;
int i, rank, size, bufsize, errcnt = 0;
double *inbuf, *outbuf, value;
MTest_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
MPI_Op_create((MPI_User_function *) add, 1, &op);
bufsize = 1;
while (bufsize < 100000) {
inbuf = (double *) malloc(bufsize * sizeof(double));
outbuf = (double *) malloc(bufsize * sizeof(double));
if (!inbuf || !outbuf) {
fprintf(stderr, "Could not allocate buffers for size %d\n", bufsize);
errcnt++;
break;
}
value = (rank & 0x1) ? 1.0 : -1.0;
for (i = 0; i < bufsize; i++) {
inbuf[i] = value;
outbuf[i] = 100.0;
}
MPI_Allreduce(inbuf, outbuf, bufsize, MPI_DOUBLE, op, MPI_COMM_WORLD);
/* Check values */
value = (size & 0x1) ? -1.0 : 0.0;
for (i = 0; i < bufsize; i++) {
if (outbuf[i] != value) {
if (errcnt < 10)
printf("outbuf[%d] = %f, should = %f\n", i, outbuf[i], value);
errcnt++;
}
}
free(inbuf);
free(outbuf);
bufsize *= 2;
}
MPI_Op_free(&op);
MTest_Finalize(errcnt);
return MTestReturnValue(errcnt);
}
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