[rules-users] Drools 5.5.0 - Execution Performance

[Wolfgang Laun]

You are aware of Java's JIT compilation?

Do you retract the facts after each cycle? Is the Working Memory in
Identity or Equality assertion mode?

Micro-benchmarking Java is tricky. "Beware of the Microbenchmark!" (Dr
Heinz Kabutz,  http://www.javaspecialists.eu/archive/Issue124.html)

Try to separate the effects by inserting one set of facts until
insertion times have stabilized. Of course, Identity without
retraction will not tell you anything about the speed of handling
assertions with your particular rule set.

-W

On 25/11/2013, ch3xy <igor.strilic at gmail.com> wrote:
> Hello,
>
> first of all I'd like to mention that i am pretty new to Drools, so please
> be patient :-)
> We are using Drools 5.5.0. we have a knowledgeBase of about 500 rules and a
> pretty complex object structure. So far everything is working fine … at the
> moment we are testing the performance of the engine and we encountered a
> quite strange  thing. We generated about 10 objects, inserted it into the
> session and measured time needed for execution of rules. To simulate a high
> number of facts, we inserted the same objects over and over again (100x,
> 1000x, 10000x). When the first objects were inserted, the time of execution
> was about 100ms but for each iteration the execution got faster and faster
> (20ms, 10ms and later on even 1ms) ..
>
> Now my question: Are the objects somehow cached in the working memory, so
> that execution gets faster or does this increase of performance has an other
> reason? I read a few things about shadow facts which are not present anymore
> since Drools 5 and sync and async Rete and I think this could be a potential
> answer for my question, but I am not able to understand this completely. For
> me it is important to know whether the increase of performance is only due
> to the fact that we are inserting the same facts over and over again or if a
> significant increase of performance is still possible if facts are not
> identical?
>
> Can someone help me?
>
> Thanks in advance
>
>
>
>
> --
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>
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