1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
/* A simple bugged MPI_ISend and MPI_IRecv test */
/* Copyright (c) 2009-2025. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
#include <stdio.h>
#include <mpi.h>
#include <simgrid/modelchecker.h>
int main(int argc, char **argv)
{
int x;
int y;
int size;
int rank;
MPI_Status status;
/* Initialize MPI */
int err = MPI_Init(&argc, &argv);
if (err != MPI_SUCCESS) {
printf("MPI initialization failed!\n");
exit(1);
}
MPI_Comm_size(MPI_COMM_WORLD, &size); /* Get nr of tasks */
MPI_Comm_rank(MPI_COMM_WORLD, &rank); /* Get id of this process */
if (size % 3 != 0) {
printf("run this program with exactly 3*N processes \n");
MPI_Finalize();
exit(0);
}
if (rank % 3 == 0) {
MPI_Recv(&x, 1, MPI_INT, MPI_ANY_SOURCE, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
printf("(%d) x <- %d\n", rank, x);
MPI_Recv(&y, 1, MPI_INT, MPI_ANY_SOURCE, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
printf("(%d) y <- %d\n", rank, y);
}else{
MPI_Send(&rank, 1, MPI_INT, (rank / 3) * 3, 42, MPI_COMM_WORLD);
printf("Sent %d to rank %d\n", rank, (rank / 3) * 3);
}
MPI_Finalize();
return 0;
}
|
