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

hi, I'm new to Drools and I'm doing some performance benchmark to see if I can scale up a StatelessSession engine. I did the benchmark on a 8 core machine but the results shows the engine can only take advantage of 1.5 cores at any time. here is my tests: 1. create a KnowledgeBase 2. started multiple threads (I tried 4/8/16 threads) running same loop: create a stateless session from KnowledgeBase and create a new fact, then insert the fact into the session. After running the test for multiple times I found that it can only utilize at most 1.5 cores at the same time. I also found that most of time threads were blocked by static class locks like: public static synchronized ProcessRuntimeFactoryService getProcessRuntimeFactoryService() Anyone has experience scaling up a stateless drools engine? Thanks a lot. -Ping -- 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.