title: Is there way to track progress on a mclapply?
body: <p>I love the setting <code>.progress = 'text'</code> in <code>plyr's</code> <code>llply</code>. However, it causes my much anxiety to not know how far along an <code>mclapply</code> (from package <code>multicore</code>) is since list items are sent to various cores and then collated at the end.</p>
  
  <p>I've been outputting messages like <code>*currently in sim_id # ....*</code> but that's not very helpful because it doesn't give me an indicator of what percentage of list items are complete (although it is helpful to know that that my script isn't stuck and moving along).</p>
  
  <p>Can someone suggest other ideas that would allow me to look at my <code>.Rout</code> file and get a sense of progress? I've thought about adding a manual counter but can't see how I would implement that since <code>mclapply</code> must finish processing all list items before it can give out any feedback.</p>