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

[ping]

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()




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