That looks great, presumably it makes little difference on the actual running times of the rules? The thing I’d really like to be optimized is rule compilation and load time (particularly as it seems to be getting slower!), however I’ve a feeling that it may not be as simple a thing to improve! Thomas From: rules-dev-bounces(a)lists.jboss.org [mailto:rules-dev-bounces@lists.jboss.org] On Behalf Of Mario Fusco Sent: 26 September 2011 09:44 To: rules-dev(a)lists.jboss.org Subject: [rules-dev] Optimizing working memory Hi, as suggested by Mark, last Thursday I pushed some optimization to the working memory. https://github.com/droolsjbpm/drools/commit/763ebf8d23d5f9ab0a47774c23aa7... As you can see I basically lazy initialized all the non-strictly necessary data structures and rewrote the updateEntryPointsCache method. Now I also had time to benchmark these improvements in terms of both memory occupation and speed. I did this by just creating a StatefulKnowledgeSession starting from a KnowledgeBase with a single simple rule. Before my optimization, each StatefulKnowledgeSession occupied 11,336 bytes and I can create (on my machine) 4,668 of them in one second. After it, each StatefulKnowledgeSession is now 8,610 bytes and in one second I can create 12,304 of them. I guess those results are truly positive and interesting especially if compared with the time (just a few hours) I needed to implement them. Would be great If you think there are other parts of the project where it could be possible to achieve similar results and then you could signal them. Mario Fusco twitter: http://twitter.com/#!/mariofusco ________________________________ ************************************************************************************** This message is confidential and intended only for the addressee. If you have received this message in error, please immediately notify the postmaster(a)nds.com and delete it from your system as well as any copies. The content of e-mails as well as traffic data may be monitored by NDS for employment and security purposes. To protect the environment please do not print this e-mail unless necessary. NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18 4EX, United Kingdom. A company registered in England and Wales. Registered no. 3080780. VAT no. GB 603 8808 40-00 **************************************************************************************

Has this gone in since the Beta version then? See http://drools.46999.n3.nabble.com/Drools-5-2-performance-building-Knowled... for my previous experiences about this. I’m trying to upgrade out drools to the latest version as we speak anyway (thanks for releaseing the CR1 yesterday it means I don’t get people asking me why we are using a Beta ☺ ) Will let you know if I notice any difference in the numbers once I’ve done this, Thanks, Thomas From: rules-dev-bounces(a)lists.jboss.org [mailto:rules-dev-bounces@lists.jboss.org] On Behalf Of Mario Fusco Sent: 26 September 2011 09:59 To: Rules Dev List Subject: Re: [rules-dev] Optimizing working memory Hi Thomas, did you already give a look to the release notes of the last 5.3.0.CR1 ? http://docs.jboss.org/drools/release/5.3.0.CR1/droolsjbpm-introduction-do... I personally worked to some optimization of both the MVEL library and Drools internals and, as you can read there, this last release should should be (accordingly to my benchmarks) about 3 times faster in both the supported dialects. Would be great if you could give it a try and confirm that you experience a similar improvement. Thanks, Mario ________________________________ ************************************************************************************** This message is confidential and intended only for the addressee. If you have received this message in error, please immediately notify the postmaster(a)nds.com and delete it from your system as well as any copies. The content of e-mails as well as traffic data may be monitored by NDS for employment and security purposes. To protect the environment please do not print this e-mail unless necessary. NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18 4EX, United Kingdom. A company registered in England and Wales. Registered no. 3080780. VAT no. GB 603 8808 40-00 **************************************************************************************