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 unsigned long long* sb = (unsigned long long *) xbt_malloc(size * sizeof(unsigned long long));
25 unsigned long long* rb = (unsigned long long *) xbt_malloc(size * sizeof(unsigned long long));
27 for (i = 0; i < size; ++i) {
28 sb[i] = rank*size + i;
31 printf("[%d] sndbuf=[", rank);
32 for (i = 0; i < size; i++)
33 printf("%llu ", sb[i]);
37 status = MPI_Reduce(sb, rb, size, MPI_UNSIGNED_LONG_LONG, MPI_SUM, root, MPI_COMM_WORLD);
38 MPI_Barrier(MPI_COMM_WORLD);
41 printf("[%d] rcvbuf=[", rank);
42 for (i = 0; i < size; i++)
43 printf("%llu ", rb[i]);
45 if (status != MPI_SUCCESS) {
46 printf("all_to_all returned %d\n", status);
51 printf("[%d] second sndbuf=[", rank);
52 for (i = 0; i < 1; i++)
53 printf("%llu ", sb[i]);
57 status = MPI_Reduce(sb, rb, 1, MPI_UNSIGNED_LONG_LONG, MPI_PROD, root, MPI_COMM_WORLD);
58 MPI_Barrier(MPI_COMM_WORLD);
61 printf("[%d] rcvbuf=[", rank);
62 for (i = 0; i < 1; i++)
63 printf("%llu ", rb[i]);
65 if (status != MPI_SUCCESS) {
66 printf("all_to_all returned %d\n", status);
73 return (EXIT_SUCCESS);