I posted a few weeks ago about high memory usage with Apache and ISPConfig: http://www.howtoforge.com/forums/showthread.php?t=51955 I believed the cause was fastcgi or poor Apache configuration. However, I have disabled a number of Apache modules, stopped using fastcgi, and limited MaxClients along with a number of other settings. About once a week, my apache processes go through the roof with memory. It happens so quickly that munin doesn't even show any spikes. One minute, everything is normal, the next minute, the graphs stop updating. At present, I fix it by running a 'killall apache2', though obviously, I don't want to do this all the time. During these 'high load' times, CPU usage is normal, and 'apache2ctl fullstatus' doesn't offer anything suspicious. Any advice?