title: how to make a fork cluster
body: <p>Sorry for asking trivial questions. I am using 'makeForkCluster' function in Parallel package to create clusters on Linux. But there isn't any response (no error, no warning and success). I would appreciate if if anyone can give some examples.</p>
  
  <p>Here is my code of the function:</p>
  
  <pre><code>cl_fork &lt;- makeForkCluster(nnodes = getOption("mc.cores", 2L), useXDR = FALSE,port=11330)
  </code></pre>