title: error on running mpi job
body: <p>I'm trying to run a MPI job on a cluster with torque and openmpi 1.3.2 installed and I'm always getting the following error:</p>
  
  <p>"mpirun was unable to launch the specified application as it could not find an executable:
  Executable: -p
  Node: compute-101-10.local
  while attempting to start process rank 0."</p>
  
  <p>I'm using the following script to do the qsub:</p>
  
  <pre><code>#PBS -N mphello
  #PBS -l walltime=0:00:30
  #PBS -l nodes=compute-101-10+compute-101-15
  cd $PBS_O_WORKDIR
  mpirun -npersocket 1 -H compute-101-10,compute-101-15 /home/username/mpi_teste/mphello
  </code></pre>
  
  <p>Any idea why this happens? 
  What I want is to run 1 process in each node (compute-101-10 and compute-101-15). What am I getting wrong here?
  I've already tried several combinations of the mpirun command, but either the program runs on only one node or it gives me the above error...</p>
  
  <p>Thanks in advance!</p>