title: Documentation of xhprof php profiler needed
body: <p>The last days I was trying to install and run the xhprof.
  I finally made it and I think that it brings up very interesting information. I also installed graphviz and I can generate nice graphs, but I would like to find a documentation explaining what the colors in the graphs mean? What does exactly mean each column of the profiler report and how is it calculated.</p>
  
  <p>I was trying to find something the whole day, but unfortunately the only information that I found were usage documentation.</p>
  
  <p>Does any of you have such documentation or know a link? 
  <a href="http://mirror.facebook.net/facebook/xhprof/doc.html" rel="nofollow">This link</a> seems to be broken...</p>