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
18 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);
33 sb = (int *) xbt_malloc(count * sizeof(int));
34 rb = (int *) xbt_malloc(count * size * sizeof(int));
36 for (i = 0; i < count; ++i)
37 sb[i] = rank * count + i;
38 for (i = 0; i < count * size; ++i)
41 printf("[%d] sndbuf=[", rank);
42 for (i = 0; i < count; i++)
46 status = MPI_Gather(sb, count, MPI_INT, rb, count, MPI_INT, root, MPI_COMM_WORLD);
49 printf("[%d] rcvbuf=[", rank);
50 for (i = 0; i < count * size; i++)
55 if (status != MPI_SUCCESS) {
56 printf("allgather returned %d\n", status);
62 MPI_Barrier(MPI_COMM_WORLD);
64 return (EXIT_SUCCESS);