1 /* Copyright (c) 2009-2010, 2013-2014. 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
18 int main(int argc, char *argv[])
25 MPI_Init(&argc, &argv);
26 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
27 MPI_Comm_size(MPI_COMM_WORLD, &size);
29 unsigned long long* sb = (unsigned long long *) xbt_malloc(size * sizeof(unsigned long long));
30 unsigned long long* rb = (unsigned long long *) xbt_malloc(size * sizeof(unsigned long long));
32 for (i = 0; i < size; ++i) {
33 sb[i] = rank*size + i;
36 printf("[%d] sndbuf=[", rank);
37 for (i = 0; i < size; i++)
38 printf("%llu ", sb[i]);
42 status = MPI_Reduce(sb, rb, size, MPI_UNSIGNED_LONG_LONG, MPI_SUM, root, MPI_COMM_WORLD);
43 MPI_Barrier(MPI_COMM_WORLD);
46 printf("[%d] rcvbuf=[", rank);
47 for (i = 0; i < size; i++)
48 printf("%llu ", rb[i]);
50 if (status != MPI_SUCCESS) {
51 printf("all_to_all returned %d\n", status);
56 printf("[%d] second sndbuf=[", rank);
57 for (i = 0; i < 1; i++)
58 printf("%llu ", sb[i]);
62 status = MPI_Reduce(sb, rb, 1, MPI_UNSIGNED_LONG_LONG, MPI_PROD, root, MPI_COMM_WORLD);
63 MPI_Barrier(MPI_COMM_WORLD);
66 printf("[%d] rcvbuf=[", rank);
67 for (i = 0; i < 1; i++)
68 printf("%llu ", rb[i]);
70 if (status != MPI_SUCCESS) {
71 printf("all_to_all returned %d\n", status);
78 return (EXIT_SUCCESS);