1 /* Copyright (c) 2009-2010, 2013. 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 //define MAXLEN 300000
20 int main(int argc, char *argv[])
29 MPI_Init(&argc, &argv);
30 int maxlen = argc >= 2 ? atoi(argv[1]) : 1;
32 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
33 MPI_Comm_size(MPI_COMM_WORLD, &size);
34 if (maxlen>1)mult=size;
35 sb = (int *) xbt_malloc(size *maxlen * sizeof(int));
36 rb = (int *) xbt_malloc(size *maxlen * sizeof(int));
38 for (i = 0; i < size *maxlen; ++i) {
39 sb[i] = rank*size + i;
43 printf("[%d] sndbuf=[", rank);
44 for (i = 0; i < size *mult; i++)
48 status = MPI_Allreduce(sb, rb, size *maxlen, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
50 printf("[%d] rcvbuf=[", rank);
51 for (i = 0; i < size *mult; i++)//do not print everything
57 if (status != MPI_SUCCESS) {
58 printf("all_to_all returned %d\n", status);
65 return (EXIT_SUCCESS);