From: Greg Barton <greg_barton(a)yahoo.com&gt; Subject: Re: [rules-users] Starting engine using fireUntilHalt and inserting no facts results in 50% CPU usage To: "Rules Users List" <rules-users(a)lists.jboss.org&gt; Date: Monday, October 25, 2010, 3:18 PM I was going to look at this at some point.  I guess that point will be tonight. :) GreG On Oct 25, 2010, at 15:02, Edson Tirelli <tirelli(a)post.com&gt; wrote:   No worries, it is a good starting point anyway. Hopefully someone can continue from there or I will eventually fix it. Just a lot of stuff in my plate already that have priority over this.   Edson 2010/10/25 mardo <mardo(a)abicola.de&gt;: Unfortunately no, I just had a look how it was implemented (like http://tutorials.jenkov.com/java-concurrency/thread-signaling.html#missedsig nals) -> missed signals and noticed that it somehow didn't work as intended. But no idea how to directly correct it, sorry. -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli Sent: Montag, 25. Oktober 2010 21:30 To: Rules Users List Subject: Re: [rules-users] Starting engine using fireUntilHalt and inserting no facts results in 50% CPU usage   Do you have a solution/patch for it?   Edson 2010/10/25 mardo <mardo(a)abicola.de&gt;: Luckily just stumbled upon this mail... You can take a look at http://drools-java-rules-engine.46999.n3.nabble.com/fireUntilHalt-and-OSGi-C PU-load-td1022352.html where I already provided a minimal example (don't know if it covers all cases) and tracked it down to missedNotifyAll in DefaultAgenda cheers -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli Sent: Montag, 25. Oktober 2010 21:17 To: Rules Users List Subject: Re: [rules-users] Starting engine using fireUntilHalt and inserting no facts results in 50% CPU usage This is clearly a regression as Drools should be not be using busy waits in fireUntilHalt(). It should use monitors and locks as it was doing before. Can anyone open a JIRA? also, if anyone would be willing to take investigate and fix this one, it would really help. Otherwise, I will add it to my queue. Thanks,   Edson 2010/10/25 Norman C <rent_my_time(a)yahoo.com&gt;: Note that the 100% CPU issue with fireUntiHalt is only with the 5.1 version of Drools.  In 5.0.x, CPU is close to 0% when there are no rules to fire.  I saw this when I was testing upgrading to 5.1. Norman ----- Original Message ---- From: jschmied <nabble(a)juergenschmied.de&gt; To: rules-users(a)lists.jboss.org Sent: Sun, October 24, 2010 4:06:02 AM Subject: Re: [rules-users] Starting engine using fireUntilHalt and inserting no facts results in 50% CPU usage Hi! fireUntilHalt uses one processor with 100%. You have a dualcore, so it's 50%. It's by design like this. You can: - Call fireAllRules after every insert if you have no ruleflow. - Use fireAllRules in a loop with a small sleep and check for the end of the ruleflow in the loop: while (prc.getState() == ProcessInstance.STATE_ACTIVE) {     Threads.sleep(20);     ksession.fireAllRules(); } with both methods you get a low cpu load. bye juergen -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Starting-engine-using-fi reUntilHalt-and-inserting-no-facts-results-in-50-CPU-usage-tp1760370p1761821 .html Sent from the Drools - User 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 --   Edson Tirelli   JBoss Drools Core Development   JBoss by Red Hat @ www.jboss.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 --   Edson Tirelli   JBoss Drools Core Development   JBoss by Red Hat @ www.jboss.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 --   Edson Tirelli   JBoss Drools Core Development   JBoss by Red Hat @ www.jboss.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