Dear MPI users,

Recently I moved to Ubuntu 13.10 and I got a problem with running my codes on ubutnu 13.10.

After checking my code I tried to execute a hello world! code instead to make sure that the problem is from mpi or not. Then I find that rank of all processes is 0 and size is 1 independent from the number of processes that I use with mpiexec.

herer is the code:

#include <mpi.h>
#include <iostream>
using namespace std;
int main(int argc ,char ** argv)
{

    int size,rank;

    MPI_Init(&argc, &argv);
    MPI_Comm_size(MPI_COMM_WORLD, &size);
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
   cout<<rank<<endl;
    MPI_Finalize();

}

Is there any thing wrong with this code?

Thanks in advance,

Ehsan