10:02 a.m.
This looks different to what was fixed in 4.0.4. I'm cc'ing brockm to
get his feedback as it looks like an MVEL bug on accessors.
Mark
Fernando Meyer wrote:
Hi Ingomar,
Which drools version are you using? We made improvements on 4.0.4,
that fixes concurrency issues on mvel core, so if you aren't using it
please do an update and try test against your environment.
Please let me know if your problems go away when you upgrade.
Thanks
On Jan 22, 2008 11:13 AM, Ingomar Otter <ingomar.otter(a)valtech.de
<mailto:ingomar.otter@valtech.de>> wrote:
Folks,
I am currently trying to scale our implementation by farming out
request into mutliple threads. I am on a 4 CPU Mac.
A few things I am wondering about:
1. Although I see an increase in CPU load when going from single
to multi-threaded processing the throughput increased marginally.
I am pretty sure that my measurements are correct. I have checked
the GC and this is not the source of congestion. My question here
is whether Drools is using lot's of synchronization that may
explain this.
2. When I share the RuleBase accross threads (which I think is
valid?) I get interesting errors during execution. eg:
org.drools.RuntimeDroolsException : Exception executing predicate
org.drools.base.mvel.MVELPredicateExpression@bb981e
atorg.drools.rule.PredicateConstraint.isAllowedCachedRight(
PredicateConstraint.java:246)
at
org.drools.common.TripleBetaConstraints.isAllowedCachedRight(TripleBetaConstraints.java:200)
atorg.drools.reteoo.JoinNode.assertObject(JoinNode.java:150)
atorg.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:318)
atorg.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:153)
at org.drools.reteoo.Rete.assertObject(Rete.java:175)
atorg.drools.reteoo.ReteooRuleBase.assertObject
(ReteooRuleBase.java:192)
at
org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:71)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:909)
atorg.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:881)
atorg.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:682)
atxxxx.DroolsPD.validate(DroolsPD.java:66)
at xxxx.DroolsMTRunner.run(DroolsMTRunner.java:30)
at java.lang.Thread.run(Thread.java:552)
Caused by: org.mvel.CompileException: cannot invoke getter:
getSAClass [declr.class: xxx.AbstractSA; act.class: null]
atorg.mvel.optimizers.impl.refl.GetterAccessor.getValue(
GetterAccessor.java:52)
at
org.mvel.optimizers.impl.refl.VariableAccessor.getValue(VariableAccessor.java:39)
at
org.mvel.ast.VariableDeepPropertyNode.getReducedValueAccelerated(VariableDeepPropertyNode.java:22)
atorg.mvel.ast.PropertyASTNode.getReducedValueAccelerated(PropertyASTNode.java:21)
at
org.mvel.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:21)
at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
at org.mvel.CompiledExpression.getValue(CompiledExpression.java:111)
atorg.mvel.MVEL.executeExpression(MVEL.java:235)
at
org.drools.base.mvel.MVELPredicateExpression.evaluate(MVELPredicateExpression.java:36)
atorg.drools.rule.PredicateConstraint.isAllowedCachedRight(PredicateConstraint.java:240)
... 13 more
Caused by: java.lang.NullPointerException
atsun.reflect.GeneratedMethodAccessor6.invoke (Unknown Source)
atsun.reflect.DelegatingMethodAccessorImpl.invoke(
DelegatingMethodAccessorImpl.java:25)
atjava.lang.reflect.Method.invoke( Method.java:324)
at
org.mvel.optimizers.impl.refl.GetterAccessor.getValue(GetterAccessor.java:42)
... 22 more
Details:
* I use StatelessSessions which are private to the threads
* No data is shared between threads (with the exception of the
RuleBase, as outline above)
* I am on JDK 1.5
I would be grateful for any pointers for 'correct' use of Drools
in an MT environment.
Cheers,
Ingomar
Ingomar Otter
Chief Technology Officer
ingomar.otter(a)valtech.de <mailto:ingomar.otter@valtech.de>
Mobile: +49 172 2367867
Valtech GmbH
Bahnstraße 16
40212 Düsseldorf
Germany
Phone: +49 (0)211 179237-0
Fax: +49 211 179237-19
www.valtech.de <http://www.valtech.de/>
Geschäftsführer: Ingo Kriescher
Amtsgericht Düsseldorf HRB48672
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--
Fernando Meyer http://fmeyer.org
JBoss Rules Core Developer
fernando(a)fmeyer.org <mailto:fernando@fmeyer.org>
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