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

Sat Sep 18 04:00:55 EDT 2010

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

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Today's Topics:

   1. Re: Perfromance issues and memory leaks in Drools (Edson Tirelli)

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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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