Robert,

    This is a very complex evaluation to do, since most of the published benchmarks will give you different results for the same rules engine. :) Also, the first and third links you listed bellow, all refer to Drools 2.x series that were not Rete complete implementations. Just to show you the difference between drools 2.x and 3.x, check this:

http://blog.athico.com/2006/11/rush-hour-and-content-based-routing.html

    Drools 4.x is even faster for complex rules scenarios with lots of partial matches.

    The testimonies though are good for you to check out as they are recent testimonies.

    Best thing to do would be, if possible, to build a prototype with a use case closer to what you need and check the numbers out. We are sure that on a face to face performance comparison, you will be pleasant surprised with the power of the Drools rules engine.

    If you need help on the prototype, just mail the list, or if you want official support for it, just contact Red Hat.

    Regards,
       Edson


2007/8/1, Robert Mertens < rmertens@bobm.org>:

I would be interested in any feedback from users who have used / are using
the JBoss Rules engine in a high performance environment.

In order to justify the use of JBoss Rules / Drools, I need to be able to
reference implementations that are using this rule engine in a production
environment.

The BRMS components that form part of release 4.0 allow it to be evaluated
alongside Ilog Rules and Blaze Advisor; however, I really need some case
studies that detail the numbers of facts and rules that are in production
use, and any related stability issues.

To date, I have come across the following links :

http://legacy.drools.codehaus.org/Testimonies
http://lists.jboss.org/pipermail/rules-users/2007-July/002097.html
http://geekswithblogs.net/cyoung/articles/54022.aspx - Microsoft's Rule
Engine Scalability Results - A comparison with Jess and Drools

Does anybody know of any links to case studies, or performance /scalability
tests?

Thanks

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  Edson Tirelli
  Software Engineer - JBoss Rules Core Developer
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