title: How to set the number of threads to use for par
body: <p>I <a href="https://stackoverflow.com/a/5425354/298389">know</a> that you can set the number of threads to use for all .par operations like so:
  <code>collection.parallel.ForkJoinTasks.defaultForkJoinPool.setParallelism(parlevel: Int)</code></p>
  
  <p>But is it possible to set the number of threads to use for just one .par call?</p>