Hello, I'm having trouble when trying to insert() facts inside parallel StatefulKnowledgeSessions. From a main() java program I start multiple threads. Every thread creates new KnowledgeBase and every KnowledgeBase creates new StatefulKnowledgeSession so I have one StatefulKnowledgeSession in every thread. Once StatefulKnowledgeSession has been created, I insert lots of facts in each StatefulKnowledgeSession. What was expected? I expected to run insert() in parallel, each insert inside its thread StatefulKnowledgeSession. 4 threads inserting lots of facts inside its own StatefulKnowledgeSession is expected to run in parallel and see how CPU usage increases. What have I seen? when all threads are inserting facts in its own StatefulKnowledgeSession I can see that only one CPU is being used so there is no parallel insertion in different StatefulKnowledgeSession. Is there a synchronization inside insert() code? It's so strange. Even if i try with 12 threads, I can't see a CPU usage increase when executing parallel insert() inside different StatefulKnowledgeSession (threads). Help please. This is my thread code (no static objects): public class KnowledgeSessionThread extends Thread { private StatefulKnowledgeSession session; private Message[] facts; public KnowledgeSessionThread(Message[] facts) throws Exception { session = readKnowledgeBase().newStatefulKnowledgeSession(); this.facts = facts; } public void run() { try { for( int i = 0; i< facts.length; i++ ) { session.insert(facts[i]); } session.startProcess("flowId"); session.fireAllRules(); session.dispose(); System.out.println("Thread finished"); } catch( Exception e ) { e.printStackTrace(); } } private KnowledgeBase readKnowledgeBase() throws Exception { KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"), ResourceType.DRL); kbuilder.add(ResourceFactory.newClassPathResource("Sample.bpmn"), ResourceType.BPMN2); KnowledgeBuilderErrors errors = kbuilder.getErrors(); if (errors.size()> 0) { for (KnowledgeBuilderError error: errors) { System.err.println(error); } throw new IllegalArgumentException("Could not parse knowledge."); } KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(); kbase.addKnowledgePackages(kbuilder.getKnowledgePackages()); return kbase; } } -- View this message in context:http://drools.46999.n3.nabble.com/ksession-insert-executes-sequen... 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