title: Calculate Total disk i/o by a single process
body: <p>I am looking for some tool that will dump total disk I/O by a single process after it ends.
  So far my finding is :-</p>
  
  <ul>
  <li><strong>iotop</strong>= It shows i/o per process in real time but does not give
  total after process end. </li>
  <li><strong>iostat</strong>= It shows real time I/O but
  does not tell process</li>
  </ul>
  
  <p><em>For example</em>, I have some process running in background with PID ####. I need the Total Bytes <strong>Written</strong> and <strong>Read</strong> by that process in total after the process ends.Can anybody tell how I can extract this information given a process PID.</p>