I'm running a mongrel cluster behind Apache + mod_proxy. Several times a day, one Mongrel will spike to 99-101% CPU usage and freeze there. The standard mongrel_rails restart command won't affect it, nor will it respond to anything short of a kill -6. Memory usage remains low when this happens. There doesn't seem to be a pattern behind it; sometimes it'll happen several times in quick succession, other times it'll go for hours without a problem. Usage is pretty light, as the site is pre-launch and just in use by a few testers. It's not tied to any specific action like file uploads, nor any particular URL. Even when I hit it with a heavy stress test via apache bench I am unable to duplicate the problem reliably.
So far I've tried the following: reinstalling the native C MySQL gem (v2.7); checking open file descriptors (lsof generally reports about 60 files under the hung process); strace and gdb (no glaring errors jump out at me, but I haven't used these tools in the past so I may be missing something); setting SetEnv force-proxy-request-1.0 1 and proxy- nokeepalive 1; setting ActiveRecord::Base.verification_timeout to a lower setting; and leaving my shoes by the door for the server gnomes to fill with candy. Nothing seems to have worked. My environment is: Mongrel 1.1.5 MongrelCluster 1.0.5 Apache 2.2.3, using mod_proxy Ruby 1.8.6 RHEL 5.1 Has anyone seen this behavior before? Does anyone have any other debug tips that might be useful? At this point I'm pretty lost, and not sure at all if the problem is in my application or in the server stack. Thanks for any insight you might have. j --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Deploying Rails" group. To post to this group, send email to rubyonrails-deployment@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/rubyonrails-deployment?hl=en -~----------~----~----~----~------~----~------~--~---
