Don't forget you can also schedule your instances with WOMonitor. However, I know some "big" apps that are running several weeks without restart. So it's not a fatality…
There is also JProfiler that is good tool (but not free). And there is an interesting WOWODC'08 video about Shark (I hope Shark is still usable with java applications). http://www.wocommunity.org/webobjects_screencasts.html Philippe On 14 mars 2011, at 11:52, Q wrote: > Try using jvisualvm or a similar tool to get a heap dump of the JVM after it > has been running for a while so you can see where the memory is actually > being used. > > On 14/03/2011, at 6:36 PM, Gennady Kushnir wrote: > >> Hello again everybody. >> I still hope somebody would answer. >> I'va made GC logging with -XX:+PrintGCDetails and I see some >> interesting things happening. >> It seems like some uncollectable garbage is being accumulated in memory. >> Within the first hour heap usage goes up 35M and then within next 6 >> hours falls back to that number after rare fullGC acts. >> After 8 hours that lower limit goes up to 40M, after 20 hours - to 45M >> and fullGC acts happen significantly more often. >> After 30 hours heap usage would not fall lower 50M and after 35 hours >> almost every GC is fullGC. Since 60 hour lowest heap usage is 55M. >> Finally at about 95 hours I get OutOfMemory error as the heap is >> limited by default to 64M. >> >> So my question is - what should I do now? >> Is it expected behavior for large WO application? >> Should I simply rise max heap limit to find memory amount that would be >> enough? >> Should I schedule WOMonitor to restart the App every night? >> Or such behavior should be considered as my error somewhere in code? >> So where should I look for memory leaks? >> >> 2011/3/3 Gennady Kushnir <genk...@rujel.net>: >>> Hello All! >>> I would raise this topic again. Thanks for all tips you have me. >>> Jprofiler is too commercial for me unfortunately. And VisualVM failed >>> to run on my deployment system (Xserve G4). >>> In fact even when run on my dev system, I could not actually figure >>> out how it could help me :( >>> I feel sad about I loosely know many aspects in Java technology. Could >>> you give me some links where to read about such things as "Eden", >>> "young generation" and "survivors" - I did not get these terms. >>> >>> And about those ec's that don't get garbage collected. After >>> eliminating all references to EO's outside components I still could >>> not get rid of that issue. >>> When debugging I've finally noticed inside a WOSession object an >>> NSMutableDictionary called _contextRecords, which holds hard >>> referenced on ALL previously used components. Even though I have >>> reduced pageCacheSize to 5 in an Application constructor. >>> And those components hold references to those ec's so they can't get >>> garbage collected... >>> Sad... >>> >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) >> Help/Unsubscribe/Update your Subscription: >> http://lists.apple.com/mailman/options/webobjects-dev/qdolan%40gmail.com >> >> This email sent to qdo...@gmail.com > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/webobjects-dev/prabier%40me.com > > This email sent to prab...@me.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/webobjects-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
