[rules-users] Perfromance issues and memory leaks in Drools (Edson Tirelli)

Sat Sep 18 12:48:03 EDT 2010

   That improvement was developed for Drools 5.1.x. The current
version on the downloads page is 5.1.1.

   As mentioned by Leonardo, make sure you are not rebuilding the
kbase every time. Just create it once and reuse it for your sessions.

   Edson

2010/9/18 Nikhil S. Kulkarni <Nikhil.Kulkarni at mastek.com>:
> Hi Edson,
>
> Thanks for the information.
> But now I want to ask you one thing. I have seen your post. The problem in application is mainly usage of memory
> You posted that Match 30,2010. I downloaded Drools 5.0 on August 2009 and I am using that.
>
> SO this "True modify" algorithm is implemented in Drools 5.1 only or it is even available in latest Drools 5.0
>
> If I use Drools 5.1 then Whether I will get any advantage.
>
>        In application we are using Rules Template ,Rule Flows and drls. When I am calling Rules from Java then it is taking more time compared to calling Java method from rules.
>
>
>        In addition to this can u suggest me how to write better rules Query.
>
> I am using very simple way of writing Rules Query like :-
>
> When
> Abc : ABC(condition==A)
> Then
>  Call method
> End;
>
>
>
> Thanks & Regards,
> Nikhil S. Kulkarni
>
>
>
>
>
> -----Original Message-----
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>   1. Re: Perfromance issues and memory leaks in Drools (Edson Tirelli)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 17 Sep 2010 11:04:55 -0400
> From: Edson Tirelli <tirelli at post.com>
> Subject: Re: [rules-users] Perfromance issues and memory leaks in
>        Drools
> To: Rules Users List <rules-users at lists.jboss.org>
> Message-ID:
>        <AANLkTinr2-+twT_myOijf1rc_wAw7E6CVtwjPNGKBOb_ at mail.gmail.com>
> Content-Type: text/plain; charset="windows-1252"
>
>    Nikhil,
>
>    Maybe you are using the term "memory leak" loosely here, but otherwise,
> Drools 4.0.7 and Drools 5.0.1 were both tested to exhaustion for memory
> leaks and I can tell you that no memory leak was found, and I personally
> doubt there is one there on regular use. Also, FYI, Drools 5.x eliminates
> the need for shadow facts, what is a considerable memory save over 4.x, but
> adds some other overheads for performance improvement that kind of offset
> those gains. On the other hand, Drools 5.1.1 takes the algorithm to a new
> level, saving a lot of memory on systems that use modify actions on their
> rules.
>
> http://blog.athico.com/2010/03/drools-halves-memory-use-with-new-true.html
>
>    Regarding your performance, all I can tell you is that a rules engine is
> a relational engine that works pretty much like a database, and rules as
> databases queries. The same way you can write SQL queries that run fast or
> slow on a database, you can write rules that run fast or slow on a rules
> engine. It all depends on how the rules/queries are written, how your data
> model/domain model looks like, etc.
>
>    So, regarding your question, we can't tell you how to improve those
> metrics without knowing your domain model, rules and etc.
>
>    []s
>    Edson
>
> 2010/9/17 Nikhil S. Kulkarni <Nikhil.Kulkarni at mastek.com>
>
>>  Hi,
>>
>>
>>
>>                 I have written 2 different Drools programs. One is with
>> Using rule Base of Drools 4.0 and other is using Knowledge Base of Drools
>> 5.0.
>>
>> I was trying to check that is there any improvement in Drools 5.0. But I
>> haven?t got any performance improvement in Drools 5.0 code compared to
>> Drools 4.0.
>>
>>
>>
>>                 One more important thing is I am calling this drools code
>> from  My application which itself is heavy application, when I am doing
>> Performance tuning
>>
>> I got one point i.e. session.execute() method is taking around 6-7 seconds
>> to initialize rules and even the memory utilized by Rules is huge.
>>
>>
>>
>> So is there any way that we can reduce the Memory leakage and improve
>> performance.
>>
>>
>>
>> Waiting for Reply.
>>
>>
>>
>> Thanks & Regards,
>>
>> Nikhil S. Kulkarni
>>
>> Emp No: - 9254
>>
>>
>>
>>
>>
>> MASTEK LTD.
>> In the US, we're called MAJESCOMASTEK
>>
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>
>
> --
>  Edson Tirelli
>  JBoss Drools Core Development
>  JBoss by Red Hat @ www.jboss.com
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-- 
  Edson Tirelli
  JBoss Drools Core Development
  JBoss by Red Hat @ www.jboss.com