5 int main (int argc, char **argv) {
11 MPI_Init(&argc, &argv);
12 MPI_Comm_size(MPI_COMM_WORLD, &size);
13 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
15 start_timer = MPI_Wtime();
17 MPI_Barrier( MPI_COMM_WORLD );
19 MPI_Barrier( MPI_COMM_WORLD );
21 printf("... Barrier ....\n");
22 printf("Elapsed=%lf s\n", MPI_Wtime() - start_timer);