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

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----- From: rules-users-bounces(a)lists.jboss.org [mailto: rules-users-bounces(a)lists.jboss.org] On Behalf Of rules-users-request(a)lists.jboss.org Sent: Friday, September 17, 2010 9:30 PM To: rules-users(a)lists.jboss.org Subject: rules-users Digest, Vol 46, Issue 58 Send rules-users mailing list submissions to rules-users(a)lists.jboss.org To subscribe or unsubscribe via the World Wide Web, visit https://lists.jboss.org/mailman/listinfo/rules-users or, via email, send a message with subject or body 'help' to rules-users-request(a)lists.jboss.org You can reach the person managing the list at rules-users-owner(a)lists.jboss.org When replying, please edit your Subject line so it is more specific than "Re: Contents of rules-users digest..." Today's Topics: 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(a)post.com&gt; Subject: Re: [rules-users] Perfromance issues and memory leaks in Drools To: Rules Users List <rules-users(a)lists.jboss.org&gt; Message-ID: <AANLkTinr2-+twT_myOijf1rc_wAw7E6CVtwjPNGKBOb_@mail.gmail.com&lt;AANLkTinr2-%2BtwT_myOijf1rc_wAw7E6CVtwjPNGKBOb_(a)mail.gmail.com&gt; > 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(a)mastek.com&gt; > 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 > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > Opinions expressed in this e-mail are those of the individual and not that of Mastek Limited, unless specifically indicated to that effect. Mastek Limited does not accept any responsibility or liability for it. This e-mail and attachments (if any) transmitted with it are confidential and/or privileged and solely for the use of the intended person or entity to which it is addressed. Any review, re-transmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. This e-mail and its attachments have been scanned for the presence of computer viruses. It is the responsibility of the recipient to run the virus check on e-mails and attachments before opening them. If you have received this e-mail in error, kindly delete this e-mail from desktop and server. > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > -- Edson Tirelli JBoss Drools Core Development JBoss by Red Hat @ www.jboss.com -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.jboss.org/pipermail/rules-users/attachments/20100917/2573a18... ------------------------------ _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users End of rules-users Digest, Vol 46, Issue 58 ******************************************* MASTEK LTD. In the US, we're called MAJESCOMASTEK ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Opinions expressed in this e-mail are those of the individual and not that of Mastek Limited, unless specifically indicated to that effect. Mastek Limited does not accept any responsibility or liability for it. This e-mail and attachments (if any) transmitted with it are confidential and/or privileged and solely for the use of the intended person or entity to which it is addressed. Any review, re-transmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. This e-mail and its attachments have been scanned for the presence of computer viruses. It is the responsibility of the recipient to run the virus check on e-mails and attachments before opening them. If you have received this e-mail in error, kindly delete this e-mail from desktop and server. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users