title: Memcached and virtual memory
body: <p>According to <a href="http://apartm.net/hackernews/index.php?id=3519145" rel="nofollow">this thread</a> (not very reliable, I know) memcached does not use the disk, not even <strong>virtual memory</strong>.</p>
  
  <p>My questions are:</p>
  
  <ol>
  <li><p>Is this true?</p></li>
  <li><p>If so, how does memcached ensures that the memory he gets assigned <strong>never overflows</strong> to disk?</p></li>
  </ol>