1 /* Copyright (c) 2009-2018. 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. */
13 int main(int argc, char *argv[])
20 MPI_Init(&argc, &argv);
21 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
22 MPI_Comm_size(MPI_COMM_WORLD, &size);
24 int* sb = (int *) xbt_malloc(size * sizeof(int) * 2);
25 int* rb = (int *) xbt_malloc(size * sizeof(int) * 2);
27 for (i = 0; i < size; ++i) {
28 sb[i] = rank*size + i;
32 printf("[%d] sndbuf=[", rank);
33 for (i = 0; i < size; i++)
37 status = MPI_Alltoall(sb, 1, MPI_INT, rb, 1, MPI_INT, MPI_COMM_WORLD);
39 printf("[%d] rcvbuf=[", rank);
40 for (i = 0; i < size; i++)
44 if (rank == 0 && status != MPI_SUCCESS) {
45 printf("all_to_all returned %d\n", status);
51 return (EXIT_SUCCESS);