1 /* Copyright (c) 2009, 2010. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
14 #define EXIT_SUCCESS 0
15 #define EXIT_FAILURE 1
20 int main(int argc, char *argv[])
28 MPI_Init(&argc, &argv);
29 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
30 MPI_Comm_size(MPI_COMM_WORLD, &size);
32 sb = (int *) xbt_malloc(size *MAXLEN * sizeof(int));
33 rb = (int *) xbt_malloc(size *MAXLEN * sizeof(int));
35 for (i = 0; i < size *MAXLEN; ++i) {
36 sb[i] = rank*size + i;
40 printf("[%d] sndbuf=[", rank);
41 for (i = 0; i < size *size; i++)
45 status = MPI_Allreduce(sb, rb, size *MAXLEN, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
47 printf("[%d] rcvbuf=[", rank);
48 for (i = 0; i < size *size; i++)//do not print everything
54 if (status != MPI_SUCCESS) {
55 printf("all_to_all returned %d\n", status);
62 return (EXIT_SUCCESS);