Re: [rules-users] Drools compiler memory & stateless sessions?

hi, I was facing similar issues some time back, though I was using a ruleflow and had >20000 fact objects evaluated daily. The problem I was facing was that the running time would get significantly slower day by day. The solution that fixed it was to use a statefulSession and call dispose() on the session once it is done. This made a single-run slower than before, but atleast fixed the problem of exponentially increasing the run-time after several days. This might not necessarily be the ideal solution, so before you move to a StatefulSession and call session.dispose() after processing, you might want to try to increase the memory for the jvm, if is lower than the size of your facts, this might fix it. It'd be useful to know if somebody has a better solution to Kris's problem. Thanks, - am On Wed, Nov 26, 2008 at 9:35 AM, Kris Nuttycombe < kris.nuttycombe(a)gmail.com&gt; wrote: > Hi, all, > > I'm encountering significant problems with running out of memory when > executing a small ruleset (only 16 rules, < 100 facts). I've run jmap on the > process (which has previously spawned multiple stateless sessions in > parallel) and it looks like Drools, and specifically the Eclipse jdt > compiler, is seriously eating up memory. The code calling the is fairly > simple; one of the initial facts is an accumulator that I refer to later: > > StatelessSession session = ruleBase.newStatelessSession(); > session.execute(initialFact, accumulator); > > accumulator.doSomething(); > > where ruleBase is a shared instance, and initialFact is a base fact that > is expanded during rules processing. Is there something I should be doing to > dispose the session after use to release the objects created by the drools > compiler after use? I'm using a shared RuleBase, and I'm wondering whether > it is somehow keeping references around. Are these sorts of object counts to > be expected? > > Thanks, > > Kris > Instance Counts for All Classes (excluding platform) 104827 instances<http://carrot.gaiam.com:7000/instances/0x2aaacf5646f8>of class > net.jxta.impl.document.LiteXMLElement$charRange<http://carrot.gaiam.com:7000/class/0x2aaacf5646f8> > 26806 instances <http://carrot.gaiam.com:7000/instances/0x2aaacf5631e8>of class > net.jxta.impl.document.LiteXMLElement$tagRange<http://carrot.gaiam.com:7000/class/0x2aaacf5631e8> > 26733 instances <http://carrot.gaiam.com:7000/instances/0x2aaad66ea7f0>of class > org.eclipse.jdt.internal.compiler.lookup.MethodBinding<http://carrot.gaiam.com:7000/class/0x2aaad66ea7f0> > 17366 instances <http://carrot.gaiam.com:7000/instances/0x2aaad66e3c88>of class > [Lorg.eclipse.jdt.internal.compiler.lookup.TypeBinding;<http://carrot.gaiam.com:7000/class/0x2aaad66e3c88> > 12412 instances <http://carrot.gaiam.com:7000/instances/0x2aaacf032560>of class > com.sun.enterprise.loader.EJBClassLoader$SentinelInputStream<http://carrot.gaiam.com:7000/class/0x2aaacf032560> > 10974 instances <http://carrot.gaiam.com:7000/instances/0x2aaad5504450>of class > org.apache.commons.collections.SequencedHashMap$Entry<http://carrot.gaiam.com:7000/class/0x2aaad5504450> > 8683 instances <http://carrot.gaiam.com:7000/instances/0x2aaad68c3840> of > class org.eclipse.jdt.internal.compiler.codegen.CachedIndexEntry<http://carrot.gaiam.com:7000/class/0x2aaad68c3840> > 7708 instances <http://carrot.gaiam.com:7000/instances/0x2aaacf55e9d8> of > class net.jxta.impl.document.LiteXMLElement<http://carrot.gaiam.com:7000/class/0x2aaacf55e9d8> > 7450 instances <http://carrot.gaiam.com:7000/instances/0x2aaad5c4b6c0> of > class org.hibernate.engine.CollectionKey<http://carrot.gaiam.com:7000/class/0x2aaad5c4b6c0> > 6836 instances <http://carrot.gaiam.com:7000/instances/0x2aaaced3c3f8> of > class org.netbeans.modules.schema2beans.AttrProp<http://carrot.gaiam.com:7000/class/0x2aaaced3c3f8> > 6271 instances <http://carrot.gaiam.com:7000/instances/0x2aaad6642d18> of > class org.eclipse.jdt.internal.compiler.lookup.FieldBinding<http://carrot.gaiam.com:7000/class/0x2aaad6642d18> > 5643 instances <http://carrot.gaiam.com:7000/instances/0x2aaad6796890> of > class org.eclipse.jdt.internal.compiler.ast.MessageSend<http://carrot.gaiam.com:7000/class/0x2aaad6796890> > 4928 instances <http://carrot.gaiam.com:7000/instances/0x2aaad68a6018> of > class org.eclipse.jdt.internal.compiler.util.HashtableOfObject<http://carrot.gaiam.com:7000/class/0x2aaad68a6018> > 4895 instances <http://carrot.gaiam.com:7000/instances/0x2aaad66e3fa8> of > class [Lorg.eclipse.jdt.internal.compiler.lookup.ReferenceBinding;<http://carrot.gaiam.com:7000/class/0x2aaad66e3fa8> > 4546 instances <http://carrot.gaiam.com:7000/instances/0x2aaad669f968> of > class org.eclipse.jdt.internal.compiler.lookup.LocalVariableBinding<http://carrot.gaiam.com:7000/class/0x2aaad669f968> > 4472 instances <http://carrot.gaiam.com:7000/instances/0x2aaad687a0a8> of > class [Lorg.eclipse.jdt.internal.compiler.lookup.LocalVariableBinding;<http://carrot.gaiam.com:7000/class/0x2aaad687a0a8> > 4128 instances <http://carrot.gaiam.com:7000/instances/0x2aaad6103ff0> of > class org.drools.rule.Pattern<http://carrot.gaiam.com:7000/class/0x2aaad6103ff0> > 3899 instances <http://carrot.gaiam.com:7000/instances/0x2aaacf493c90> of > class net.jxta.impl.id.UUID.UUID<http://carrot.gaiam.com:7000/class/0x2aaacf493c90> > 3867 instances <http://carrot.gaiam.com:7000/instances/0x2aaad5c416c0> of > class org.hibernate.engine.EntityEntry<http://carrot.gaiam.com:7000/class/0x2aaad5c416c0> > 3731 instances <http://carrot.gaiam.com:7000/instances/0x2aaad5c54d88> of > class org.hibernate.collection.PersistentSet<http://carrot.gaiam.com:7000/class/0x2aaad5c54d88> > 3685 instances <http://carrot.gaiam.com:7000/instances/0x2aaad66ca420> of > class org.eclipse.jdt.internal.compiler.lookup.UnresolvedReferenceBinding<http://carrot.gaiam.com:7000/class/0x2aaad66ca420> > 3360 instances <http://carrot.gaiam.com:7000/instances/0x2aaad6c12770> of > class org.drools.reteoo.SingleTupleSinkAdapter<http://carrot.gaiam.com:7000/class/0x2aaad6c12770> > 3266 instances <http://carrot.gaiam.com:7000/instances/0x2aaacf543dc0> of > class net.jxta.document.MimeMediaType<http://carrot.gaiam.com:7000/class/0x2aaacf543dc0> > 3264 instances <http://carrot.gaiam.com:7000/instances/0x2aaad6370288> of > class org.drools.spi.PatternExtractor<http://carrot.gaiam.com:7000/class/0x2aaad6370288> > 3163 instances <http://carrot.gaiam.com:7000/instances/0x2aaad5f8b990> of > class org.apache.axis.encoding.TypeMappingImpl$Pair<http://carrot.gaiam.com:7000/class/0x2aaad5f8b990> > 3137 instances <http://carrot.gaiam.com:7000/instances/0x2aaad5caad98> of > class org.hibernate.collection.PersistentBag<http://carrot.gaiam.com:7000/class/0x2aaad5caad98> > 2881 instances <http://carrot.gaiam.com:7000/instances/0x2aaad681b000> of > class org.eclipse.jdt.internal.compiler.lookup.MethodScope<http://carrot.gaiam.com:7000/class/0x2aaad681b000> > 2688 instances <http://carrot.gaiam.com:7000/instances/0x2aaad6161860> of > class org.drools.base.ClassFieldExtractor<http://carrot.gaiam.com:7000/class/0x2aaad6161860> > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > -- I'm worst at what I do best, and for this gift I feel blessed -- Kurt Cobain _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users