I'm having issues with a site on my server loading and was running 'top' and saw this:
Dozens of ruby processes...and I have no idea what that means or if that's normal. :)
A:
I don't know what is normal on your system.
In a sever production environment ruby scales by adding processes, so I would expect to see at least one process per CPU core. (Real or virtual - my i7 920 has 8 virtual cores and needs 8 ruby processes for a 100% CPU load.)
Dozens sound like a lot, but it could be possible if your site is using lots of ruby for miscellaneous daemon processes.
I think you'll have to ask someone who knows what is supposed to run on the system.
j-g-faustus
2009-11-12 17:50:53
That's me. :) I have a 512MB slice with Slicehost.
Shpigford
2009-11-12 17:52:48
Know the feeling :) There are way too many processes for 512 MB. Did you try out the links from Mark?
j-g-faustus
2009-11-12 19:03:51
+2
A:
I have a feeling that your PassengerMaxPoolSize is set too high for such a small amount of memory. Just totaling that up your ruby processes are eating 81% of your available memory.
See this related discussion on ServerFault. This question should probably be migrated over there.
Mark
2009-11-12 17:59:10
I hadn't set PassengerMaxPoolSize at all...the discussion at ServerFault helped a lot. Thanks!
Shpigford
2009-11-12 19:57:02