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I am using Ubuntu server and when I run ps aux I get the following process table as we can see apache proceess are shown like this:

www-data 26487 0.0 0.9 245476 14920 ? Sl 17:32 0:00 /usr/sbin/apache2 -k start

Where 2687 is the PID. How can I know wich of my enabled sites belong that process?

This is how my apache sites are defined of course I am willing to edit my apache sites if needed.

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As Kyle notes, the apache processes can be serving any virtual host defined your configuration. What are you actually trying to figure out? – cjc Apr 2 '12 at 18:20
Basically I want to know which sites (lets say the ServerName) are consuming more memory, and which consume less. – quarry32 Apr 2 '12 at 18:40
up vote 6 down vote accepted

The default MPM is prefork, which creates (as you've seen) a pre-forked Apache process that is waiting for a connection to serve a request. It does not fire off different processes for different VirtualHost declarations, so any given process could serve any of your sites.

As processes are restarted after a configurable number of requests have been served (or an idle timer passes, and the forks are cleaned up), it's possible that any given process has served pages from multiple VirtualHosts.

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So... how can I know which sites are consuming more memory at a specific moment? – quarry32 Apr 2 '12 at 18:42
Maybe you should change the title/question or start a new one for that since the current question has been answered. – Safado Apr 2 '12 at 18:53
I have created a new one… thanks – quarry32 Apr 2 '12 at 20:06
This answer ignores the fact that they are using mod_wsgi and specifically mod_wsgi daemon mode with the WSGI application delegated to that separate set of processes. More specific answer which deals with that in duplicate question. – Graham Dumpleton Apr 2 '12 at 21:51
+1'd on your post. I'm not familiar with WSGI, clearly :-) – Kyle Smith Apr 2 '12 at 22:18

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