If you use a stateless session per transaction you should generally be OK. How much lag you're likely to encounter is a much harder question to answer: how well does your database retrieval scale, would this present an issue before the rules engine? The rules engine is "just a POJO library" the overall scalability would IMO depend upon your application's architecture. On 27 April 2011 11:27, Sumeet Karawal <sumeet.karawal(a)tcs.com&gt; wrote:

Not that I'm aware of (although the general "performance" topic comes up on this forum from time-to-time, so other users may report back). Obviously performance of rules depends on how complex they are; and whether you then optimise them - much like "how many SQL queries can RDBMS xyz execute per second" On 27 April 2011 11:52, Sumeet Karawal <sumeet.karawal(a)tcs.com&gt; wrote:

Thanks Mark for the reply. Regards, Sumeet Karawal Mailto: sumeet.karawal(a)tcs.com From: Mark Proctor <mproctor(a)codehaus.org&gt; To: rules-users(a)lists.jboss.org Date: 04/27/2011 05:21 PM Subject: Re: [rules-users] Drools Performance Sent by: rules-users-bounces(a)lists.jboss.org On 27/04/2011 11:52, Sumeet Karawal wrote: figure I can write one rule that runs much slower than something with 1000 rules. So we suggest people do their own real life proof of concepts and see if they run fast enough. We tend to avoid benchmarking only because it ends up a focus point between competitors and all of them cheat making the exercise pointless. MArk OK. an IMO according _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users =====-----=====-----===== Notice: The information contained in this e-mail message and/or attachments to it may contain confidential or privileged information. If you are not the intended recipient, any dissemination, use, review, distribution, printing or copying of the information contained in this e-mail message and/or attachments to it are strictly prohibited. If you have received this communication in error, please notify us by reply e-mail or telephone and immediately and permanently delete the message and any attachments. Thank you

Thanks Nicolas. The information is really helpful. Regards, Sumeet Karawal Mailto: sumeet.karawal(a)tcs.com From: Nicolas Héron <nicolas.heron.java(a)gmail.com&gt; To: Rules Users List <rules-users(a)lists.jboss.org&gt; Date: 04/27/2011 05:37 PM Subject: Re: [rules-users] Drools Performance Sent by: rules-users-bounces(a)lists.jboss.org Hi, I have done a loyalty system with drools 4 (now they are in version 5) for a retail company in France 3 years that calculates your discount given your points, history, etc.. You have to put a lot of data in memory cache (ehcache for example) as the database is the the weak point in concurrent mode. As for drools, it was running on a simple bi-core server with 4 GB of ram and it could handle 10 concurrent calculations without problems. The total calculation time all inclusive (network connection, database, etc) does never exceed 2 seconds with about 10000 loyalty rules for 800000 products. The biggerst shop they have has more than a 100 cash machines that can be all open on a saturday afternoon. With a modern server (4-core hyperthreaded=8 cores) and all the rest and even with more ram (= place for data caching) you can even do much better. Hope it helps Regards Nicolas Héron 2011/4/27 Michael Anstis <michael.anstis(a)gmail.com&gt; If you use a stateless session per transaction you should generally be OK. How much lag you're likely to encounter is a much harder question to answer: how well does your database retrieval scale, would this present an issue before the rules engine? The rules engine is "just a POJO library" the overall scalability would IMO depend upon your application's architecture. On 27 April 2011 11:27, Sumeet Karawal <sumeet.karawal(a)tcs.com&gt; wrote: Hi, I have an Application where I have to give the discount to user according to their profile points. i.e. when the user logs in, his profile points are fetched from the database, and respectively he is given the required discount. My concern is how many concurrent users will be supported by the rules engine, will there a performance lag if the concurrent number of users exceed a certain limit. Please help me on this as I have no idea regarding this. Thanks and Reagrds, Sumeet Karawal Mailto: sumeet.karawal(a)tcs.com =====-----=====-----===== Notice: The information contained in this e-mail message and/or attachments to it may contain confidential or privileged information. If you are not the intended recipient, any dissemination, use, review, distribution, printing or copying of the information contained in this e-mail message and/or attachments to it are strictly prohibited. If you have received this communication in error, please notify us by reply e-mail or telephone and immediately and permanently delete the message and any attachments. Thank you _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users =====-----=====-----===== Notice: The information contained in this e-mail message and/or attachments to it may contain confidential or privileged information. If you are not the intended recipient, any dissemination, use, review, distribution, printing or copying of the information contained in this e-mail message and/or attachments to it are strictly prohibited. If you have received this communication in error, please notify us by reply e-mail or telephone and immediately and permanently delete the message and any attachments. Thank you