Just went live with a big site today and it's really bogged down the server. When I go into linux and type top I see a lot of php processes with assigned to the new websites user and very high cpu usage (10+ on for these php threads).
Problem is that linux top is very cryptic...is there a way to isolate from a server standpoint which php files are causing the problems?
If you're seeing actual php processes in the top output that would indicate that PHP is running in CGI mode (as opposed to as an Apache module) so instead of "top" try the command "ps ux" (make your terminal window nice and wide!) as this may point to the actual PHP script that has been invoked.
If that is revealing (I'm afraid I'm not in a position to test that immediately) then as a next step run "top" again and note the process IDs of the php instances that appear to be bogging things down, and then pipe the output of "ps ux" through a grep to narrow things down, e.g. if it looks like process ID 2345 is a culprit then use