Re: [rules-users] Drools low concurrency/high synchronization? !NOSIG!

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 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 Geschäftsführer: Ingo Kriescher Amtsgericht Düsseldorf HRB48672 _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users