[rules-users] Starting engine using fireUntilHalt and inserting no facts results in 50% CPU usage

[mardo]

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 at lists.jboss.org
[mailto:rules-users-bounces at 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 at yahoo.com>:
>
>
> 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 at juergenschmied.de>
> To: rules-users at 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.
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-- 
  Edson Tirelli
  JBoss Drools Core Development
  JBoss by Red Hat @ www.jboss.com

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