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 < 2) {
+ if (size != 2) {
printf("run this program with exactly 2 processes (-np 2)\n");
MPI_Finalize();
exit(0);