title: How to measure/profile "Datastore Reads/Writes" from a single request?
body: <p>The "<a href="http://www.google.com/enterprise/cloud/appengine/pricing.html" rel="nofollow">new pricing model</a>" has resources "Datastore Reads" and "Datastore Writes". But I could not find detailed information on exactly how this is measured.</p>
  
  <p>Hard to optimize datastore utilization if I can not profile it! Any clues on how to do that? <a href="http://code.google.com/appengine/articles/managing-resources.html" rel="nofollow">http://code.google.com/appengine/articles/managing-resources.html</a> doesnt give any details...</p>