we are attempting to identify a performance problem. There's an Apache2 server with lots of virtual hosts, each one of these managing a Content management systems for example Drupal or Joomla. Each apache process appears to eat a lot of memory. Can there be in whatever way to determine how it is loading into memory? Does each apache process load all of the files from each DocumentRoot into memory, or just the files for that DocumentRoot akin to the virtual host it's serving?