http://woolfel.blogspot.com/2006/03/jess6-vs-drools3-vs-clips-623.html
Since last Spring, Drools has been making steady progress on improving
the core RETE implementation. Tonight I ran manners64 in both Jess6 and
Drools3.
Jess 6 - 2208 ms
Drools 3 - 9781 ms
CLIPS 6.23 - 67.219 seconds
To put things in perspective, JESS is one of the fastest RETE engines
and many commercial engines can't beat it. Take for example Blaze
Advisor, which has been around for over a decade. The old blaze engine
was slow. It's well known within the rule industry. Last year FairIssacs
bought RulesPower, to get a faster engine.
In the last 8 months, Mark has rewritten Drools core and managed to make
significant performance and scalability improvements. Using the old
Drools2 core, 16 guests took several minute. Now 64 guests finishes
within 10 seconds. A modest guess is that drools3 is atleast 10-20x
faster than drools2. Hopefully the users will appreciate all the hard
work the drools team put into drools3. It's nice to know the code I
contributed last year has helped Drools 3 match CLIPS 6.23 performance.
