On Thu, Feb 9, 2012 at 4:30 PM, pron <ron.press...@gmail.com> wrote: > Yes, that's what I thought. Does anyone have any experience with Clojure's > garbage production pattern (esp. due to the persistent collection) and it's > behavior with the older GCs as well as with G1?
These are the options we run with in production - Clojure is loaded at runtime into a Tomcat application: -Dsun.rmi.dgc.client.gcInterval=600000 -Dsun.rmi.dgc.server.gcInterval=600000 -XX:+ExplicitGCInvokesConcurrent -XX:+UseConcMarkSweepGC That's the usual RMI GC fix, and selection of CMS GC which seemed to suit our memory usage better. Part of the middleware we use explicitly requests GC approximately every minute. Disabling those explicit GC calls led to long stop-the-world GC cycles often enough to have a noticeable effect on the end user experience so we set explicit calls to use CMS. This had two benefits for us: consistent performance (the CMS GC bails if takes too long so our request processing times stay fairly consistent) and keeping memory usage to reasonable levels (which means we only get occasional stop-the-world GC cycles and only under extreme bursts of load). We have min/max heap set to 2.5GB. We may revisit this as we ramp up traffic but for now this is working pretty well. The amount of time per request spent in Clojure code varies between 5% and 80% (depending on the type of request - some logic hardly hits the Clojure code, some logic is implemented almost entirely in Clojure - we expect the balance to continue to shift toward Clojure over time). -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ "Perfection is the enemy of the good." -- Gustave Flaubert, French realist novelist (1821-1880) -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
