title: Open MPI: using bind-to-core while oversubscribing
body: <p>My question is that is it possible to use <code>--bind-to-core</code> flag when oversubscribing? I am using OPEN MPI version 1.5.4 and trying oversubscribe with a factor of 2 (32 processes on 16 cores) using:</p>
  
  <pre><code>mpirun --bind-to-core --bynode --npersocket 32 --mca mpi_yield_when_idle 1 -n 32 ./$prog
  </code></pre>
  
  <p>But it returns me an error:</p>
  
  <pre><code>32 total processes failed to start
  </code></pre>
  
  <p>However, if I don't use <code>--bind-to-core</code> everything works fine. What's the problem here? Is it possible to solve?</p>