1 /* A simple bugged MPI_Send and MPI_Recv test: it deadlocks when MPI_Send are blocking */
3 /* Copyright (c) 2009-2019. The SimGrid Team. All rights reserved. */
5 /* This program is free software; you can redistribute it and/or modify it
6 * under the terms of the license (GNU LGPL) which comes with this package. */
11 int main(int argc, char** argv)
18 int err = MPI_Init(&argc, &argv);
19 if (err != MPI_SUCCESS) {
20 printf("MPI initialization failed!\n");
24 MPI_Comm_size(MPI_COMM_WORLD, &size); /* Get nr of tasks */
25 MPI_Comm_rank(MPI_COMM_WORLD, &rank); /* Get id of this process */
27 printf("run this program with exactly 2 processes (-np 2)\n");
34 MPI_Send(&rank, 1, MPI_INT, 1, 42, MPI_COMM_WORLD);
35 printf("Sent %d to rank 1\n", rank);
36 MPI_Recv(&recv_buff, 1, MPI_INT, 1, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
37 printf("rank 0 recv the data\n");
39 MPI_Send(&rank, 1, MPI_INT, 0, 42, MPI_COMM_WORLD);
40 printf("Sent %d to rank 0\n", rank);
41 MPI_Recv(&recv_buff, 1, MPI_INT, 0, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
42 printf("rank 1 recv the data\n");