Re: [rules-users] Migrating from 4.0.7 to 5.4.0.Final

Date: Mon, 25 Jun 2012 00:01:16 -0700 From: jshemali(a)hotmail.com To: rules-users(a)lists.jboss.org Subject: [rules-users] Migrating from 4.0.7 to 5.4.0.Final Hi all, I'm currently in the process of migrating an application using drools 4.0.7 to 5.4.0.Final and I've stumbled into a few issues with the new version that I find disturbing: - Our unit tests failed because the JVM ran out of perm gen space, which looks odd as in 4.0.7 we've had quite a margin to start with. - Doing several Yourkit analysis, I finally find classloading leaks: * *org.drools.rule.builder.dialect.asm.ClassGenerator.EMPTY_METHOD_BODY* is a static instance which will hold to the last instance of InternalClassLoader created * *org.drools.rule.constraint.MvelConstraint* uses an ExecutorHolder that spawns daemon threads and keeps them in a pool. Problem is these threads create class loaders, and can only be garbage collected when the thread dies, meaning never in my case... - I've quick fixed both issues, the second one by simply disabling the thread pool. - Once this is done, the perm gen behaves correctly, but the execution times are 2-3 times slower on very large set of rules (~1000). Looking at Yourkit analysis again, I see that the number of classes generated and the perm gen consumption is about 3 times higher in 5.4.0.Final. I honestly don't know how to address this. I've tried to find some other posts concerning these issues, to no avail. I don't see any work around this, short of code changes, and for reducing the number of generated classes I simply have no idea. Please correct me if I am wrong, any help would be greatly appreciated -- View this message in context: http://drools.46999.n3.nabble.com/Migrating-from-4-0-7-to-5-4-0-Final-tp4... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users