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/* Copyright (c) 2009-2018. The SimGrid Team.
* All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "mpi.h"
int main(int argc, char *argv[])
{
int rank;
int size;
int i;
int status;
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
unsigned long long* sb = (unsigned long long *) xbt_malloc(size * sizeof(unsigned long long));
unsigned long long* rb = (unsigned long long *) xbt_malloc(size * sizeof(unsigned long long));
for (i = 0; i < size; ++i) {
sb[i] = rank*size + i;
rb[i] = 0;
}
printf("[%d] sndbuf=[", rank);
for (i = 0; i < size; i++)
printf("%llu ", sb[i]);
printf("]\n");
int root=0;
status = MPI_Reduce(sb, rb, size, MPI_UNSIGNED_LONG_LONG, MPI_SUM, root, MPI_COMM_WORLD);
MPI_Barrier(MPI_COMM_WORLD);
if (rank == root) {
printf("[%d] rcvbuf=[", rank);
for (i = 0; i < size; i++)
printf("%llu ", rb[i]);
printf("]\n");
if (status != MPI_SUCCESS) {
printf("all_to_all returned %d\n", status);
fflush(stdout);
}
}
printf("[%d] second sndbuf=[", rank);
for (i = 0; i < 1; i++)
printf("%llu ", sb[i]);
printf("]\n");
root=size-1;
status = MPI_Reduce(sb, rb, 1, MPI_UNSIGNED_LONG_LONG, MPI_PROD, root, MPI_COMM_WORLD);
MPI_Barrier(MPI_COMM_WORLD);
if (rank == root) {
printf("[%d] rcvbuf=[", rank);
for (i = 0; i < 1; i++)
printf("%llu ", rb[i]);
printf("]\n");
if (status != MPI_SUCCESS) {
printf("all_to_all returned %d\n", status);
fflush(stdout);
}
}
free(sb);
free(rb);
MPI_Finalize();
return (EXIT_SUCCESS);
}
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