title: Different memory usage on different server with the same PHP website
body: <p>I have a PHP website build with Zend Framework 1.11. And I got different memory usage on the following two servers: </p>
  
  <p>A:
  MacOS + Apache/2.2.20 + PHP 5.3.6</p>
  
  <p>B:
  Scientific Linux 64 + Apache/2.2.15 + PHP 5.3.3</p>
  
  <p>For a exactly same page and condition, it cost 14MB on server A, but only 4MB on server B (calculate by xdebug).</p>
  
  <p>here is the mainly difference step:</p>
  
  <pre><code>A:
  11288560 Zend_Application-&gt;run( )
  B:
  2740744 Zend_Application-&gt;run( )
  </code></pre>
  
  <p>Can anyone tell me what's the problem? 
  And is there any way I can analyse the memory's detail usage?</p>