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 sounds like a bug.
Stateless session should definitely not get
repeatedly slower - as it's really just conenience wrapper around a
stateful session.
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.
Maybe someone can review the stateless
session code and try and find
where the memory leak is coming from?
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 <mailto:kris.nuttycombe@gmail.com>> 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 <mailto:rules-users@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