[rules-users] Performance and Memory Utilization - StatefulKnowledgeSession

[Edson Tirelli]

   You are leaking memory there, because you are not calling the dispose in
the first session, if you run the second.

   []s
   Edson

2010/2/4 HonorGod <jagadeesh.motamarri at barclayscapital.com>

>
> I have over million rows of data that are stored in a fact model. I have to
> apply 2 sets of rules [coming from 2 decision tables - cannot combine them
> for a specific reason] on each fact model.
>
> I have created static knowledgebases and stored them in cache so that they
> can be used when ever new StatefulKnowledgeSessions are required.
>
> This is how I am doing it -
>
> Iterating over the fact model one after the other and pass them to the
> method that applies rules -
>
>  public int applyRules(MyModel model) {
>        int noOfRulesFired  = 0 ;
>        StatefulKnowledgeSession kSession =
>
> ((KnowledgeBase)DroolsKnowledgeBaseManager.getInstance().knowledgeBases.get("FirstSetOfRules")).newStatefulKnowledgeSession()
> ;
>        kSession.insert(model);
>        noOfRulesFired = kSession.fireAllRules();
>
>        if( noOfRulesFired >= 1  ) {
>        kSession =
>
> ((KnowledgeBase)DroolsKnowledgeBaseManager.getInstance().knowledgeBases.get("SecondSetOfRules")).newStatefulKnowledgeSession()
> ;
>
>        kSession.insert(model);
>        kSession.insert(this);
>        noOfRulesFired +=kSession.fireAllRules();
>        }
>        kSession.dispose() ;
>        return noOfRulesFired ;
>    }
>
> Is this good approach? How can I reuse StatefulKnowledgeSessions so that I
> can insert my fact models one at a time and fire rules. Creating new
> StatefulKnowledgeSession for every fact model is consuming lot of memory
> and
> even though dispose() is called before existing method - GC might not clean
> it instently.
>
> Please assist [I am in middle of UAT and started to notice that memory
> consumption is too high] .
>
> Thanks
> --
> View this message in context:
> http://n3.nabble.com/Performance-and-Memory-Utilization-StatefulKnowledgeSession-tp187463p187463.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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