<div><br></div><div> Unfortunately, it is a hard question to answer, because it is the same as asking: what is the performance of a database (postgreSQL, Oracle, etc)? It is totally dependent on the data you load, the queries you write and the indexes you use.</div>
<div><br></div><div> So you need to think about overhead and pay-off of using such a technology. If you are considering performance alone, an nothing else (ease of rule maintenance, knowledge management lifecycle, time to market, training costs, etc) and you have 10 rules, the optimizations that the engine bring into place will probably not pay off in terms of performance and it would be more performant to write the 10 rules in java. If you have 10k rules, then the optimizations will pay off multiple times and you will have better performance than coding the rules in java (unless you are coding your rules like a rules engine compiler does).</div>
<div><br></div><div> The more rules you have, the more advantage you have using a rules engine. </div><div><br></div><div> Finally, when talking about high volumes, you will have to think about horizontal scalability as it vertical scalability is much more expensive to achieve. Using multiple agents is an easy way to do that, as long as you can partition your data.</div>
<div><br></div><div> I can tell you I've personally worked with customers with knowledge bases in the order of several tens of thousands of rules large, as well as customers with millions of facts simultaneously in memory. So it is possible to scale, but the performance of your system will depend on your use case and the more rules you have, the more benefits you get.</div>
<div><br></div><div> Edson</div><div><br></div><div> </div><br><br><div class="gmail_quote">2011/10/14 slyfox <span dir="ltr"><<a href="mailto:bobby.richards@gmail.com">bobby.richards@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
ok bad example.<br>
<br>
Are there any metrics on drools performance that I could reference?<br>
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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br> Edson Tirelli<br> JBoss Drools Core Development<br> JBoss by Red Hat @ <a href="http://www.jboss.com">www.jboss.com</a><br>