RE: [rules-users] Drools 4 poor performance scaling?

> -----Original Message----- > From: rules-users-bounces(a)lists.jboss.org > [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Ron Kneusel > Sent: Thursday, June 26, 2008 12:47 PM > To: rules-users(a)lists.jboss.org > Subject: [rules-users] Drools 4 poor performance scaling? > > > I am testing Drools 4 for our application and while sequential mode is > very fast I get very poor scaling when I increase the number of facts > for stateful or stateless sessions. I want to make sure I'm not doing > something foolish before deciding on whether or not to use Drools > because from what I am reading online it should be fast with the > number of facts I have. > > The scenario: I have 1000 rules in a DRL file. They are all of the > form: > > rule rule0000 > when > Data(type == 0, value> 0.185264); > Data(type == 3, value < 0.198202); > then > insert(new AlarmRaised(0)); > warnings.setAlarm(0, true); > end > > where the ranges checked on the values and the types are randomly > generated. Then, I create a Stateful session and run in a loop timing > how long it takes the engine to fire all rules as the number of > inserted facts increases: > > // Run > for(j=0; j < 100; j+=5) { > > if (j==0) { > nfacts = 1; > } else { > nfacts = j; > } > > System.out.println(nfacts + ":"); > > // Get a working memory > StatefulSession wm = ruleBase.newStatefulSession(); > > // Global - output > warnings = new Alarm(); > wm.setGlobal("warnings", warnings); > > // Add facts > st = (new Date()).getTime(); > for(i=0; i < nfacts; i++) { > wm.insert(new Data(rand.nextInt(4), > rand.nextDouble()-0.5)); > } > en = (new Date()).getTime(); > System.out.println(" facts = " + (en-st)); > > // Now run the rules > st = (new Date()).getTime(); > wm.fireAllRules(); > en = (new Date()).getTime(); > System.out.println(" rules = " + (en-st)); > > // Clean up > wm.dispose(); > > System.out.println("\n"); > } > > This code is based on the HelloWorldExample.java code from the manual > and the setup for the rule base is the same as in the manual. As the > number of facts increases runtime increases dramatically: > > facts -- runtime (ms) > 10 -- 168 > 20 -- 166 > 30 -- 344 > 40 -- 587 > 50 -- 1215 > 60 -- 1931 > 70 -- 2262 > 80 -- 3000 > 90 -- 4754 > > with a maximum memory use of about 428 MB RAM. By contrast, if I use > sequential stateless sessions, everything runs in about 1-5 ms. > > Is there something in my set up that would cause this, or is this how > one would expect Drools to scale? I read about people using thousands > of facts so I suspect I'm setting something up incorrectly. > > Any help appreciated! > > Ron