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Edward Z. Yang
Asked: 2011-10-22 10:30:51 +0800 CST

What does a jagged committed memory graph mean?

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We've been attempting to debug load programs on our servers, and along the way we've been looking at some graphs, like this one:

Memory graph

(The white spaces are when the server got so hosed we couldn't collect Munin stats.) I was curious to know why committed memory persistently drops down at approximately 4AM every night. Is there something obvious I'm missing? It's not like we reboot all of our user applications during that time...

Extra. This server is a shared web host. We handle about two thousand active users, and offer them CGI, FastCGI, SSH in any language they could possibly want. This server is running Fedora 13, and part of an active cluster of five servers. We use the networked filesystem AFS. We support cron but no user cronjobs run from this server (we give those to a different server.)

memory fastcgi munin

1 Answers

  1. logrotate calls service httpd graceful, which kills any running FastCGI processes. Thanks for playing.

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