title: PBS Pro: setting job array slot limit by the user
body: <p>Using <code>torque</code>  user can specify slot limit when submitting the job array by using the <code>%</code>, e.g.: <code>qsub job.sh -t 1-20%5</code> will create a job array with 20 jobs, but with only 5 running simultaneously.</p>
  
  <p>Currently I work with PBS Professional, but unfortunately, as far as I can see, option <code>%</code> is not supported. How can I achieve similar behavior as <code>%</code> in torque as simple as possible?</p>