Re: [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 _________________________________________________________________ The other season of giving begins 6/24/08. Check out the i’m Talkathon. http://www.imtalkathon.com?source=TXT_EML_WLH_SeasonOfGiving _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users