Re: [rules-users] Multi-threading inefficiency caused by static class synchronization?

Looking at the code of the thread you are running in parallel I guess that almost all of its time is spent in session creation, and during this (and the dispose) the knowledge base is a resource that needs protection. Thus, the test you are running isn't well suited for demonstrating concurrency. * Run one stateful session per thread, inserting and retracting (random) facts. * Add code wasting cycles to your rule(s). Also, make sure that the global (which is shared between sessions) isn't causing another bottleneck. -W On 11/12/2012, ping <jinpingv(a)hotmail.com&gt; wrote: > I tried profiling my test program and found that all thread spent most of > their time blocking or waiting for the same lock: > org.drools.runtime.process.ProcessRuntimeFactory.getProcessRuntimeFactoryService() > and > org.drools.common.AbstractRuleBase.lock() > > examples: > > Thread-6 [WAITING] CPU time: 1s > java.util.concurrent.locks.ReentrantReadWriteLock$WriteLock.lock() > org.drools.common.UpgradableReentrantReadWriteLock.lowPriorityWriteLock() > org.drools.common.UpgradableReentrantReadWriteLock.writeLock() > org.drools.common.AbstractRuleBase.lock() > org.drools.impl.StatelessKnowledgeSessionImpl.<init>(InternalRuleBase, > KnowledgeAgent, KnowledgeSessionConfiguration) > org.drools.impl.KnowledgeBaseImpl.newStatelessKnowledgeSession() > java.lang.Thread.run() > > > > Thread-7 [BLOCKED] CPU time: 1s > org.drools.runtime.process.ProcessRuntimeFactory.getProcessRuntimeFactoryService() > org.drools.runtime.process.ProcessRuntimeFactory.newProcessRuntime(AbstractWorkingMemory) > org.drools.common.AbstractWorkingMemory.createProcessRuntime() > org.drools.common.AbstractWorkingMemory.setKnowledgeRuntime(InternalKnowledgeRuntime) > org.drools.impl.StatefulKnowledgeSessionImpl.<init>(ReteooWorkingMemory, > KnowledgeBase) > org.drools.impl.StatelessKnowledgeSessionImpl.newWorkingMemory() > org.drools.impl.StatelessKnowledgeSessionImpl.execute(Object) > java.lang.Thread.run() > > > > > -- > View this message in context: > http://drools.46999.n3.nabble.com/Multi-threading-inefficiency-caused-by-... > 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 > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users