title: How can I run MPI-Job in multiple nodes? (multinode MPI job execution)
body: <ul>
  <li>Be able to execute a MPI job using multiple nodes to expedite the process </li>
  <li>This is the command I am currently using:</li>
  <li><code>mpirun --hostfile myhost -np 2 --map-by slot  Job.x //only executes in the first node</code></li>
  <li><code>mpirun --hostfile myhost -np 4 --map-by slot  Job.x //explits the job in two different nodes</code></li>
  </ul>
  
  <p>myhost file contains the following: </p>
  
  <ul>
  <li><code>node1 slots=2 max slots =20</code></li>
  <li><code>node2 slots=2 max slots =20</code></li>
  <li>Assumptions: 
  I am able to run the jobs on the nodes but I am not able to run a single MPI job in multiple nodes. How do I make sure that a single MPI job is running parallel in two different nodes? </li>
  </ul>