[jboss-jira] [JBoss JIRA] Commented: (JBRULES-1056) Performance of RuleBase().addPackage(.) goes down on sub sequent instances of RuleBase with large number of packages.

Performance of RuleBase().addPackage(.) goes down on sub sequent instances of RuleBase with large number of packages. --------------------------------------------------------------------------------------------------------------------- Key: JBRULES-1056 URL: http://jira.jboss.com/jira/browse/JBRULES-1056 Project: JBoss Rules Issue Type: Bug Security Level: Public(Everyone can see) Components: Drl Parser/Builder Affects Versions: 4.0.0.GA Environment: Windows Reporter: Ming Jin Assigned To: Mark Proctor Fix For: 4.0.1 Attachments: testdrools.zip I encountered a strange behavior when trying to test the performance of rule registration, meaning to add Package's to a new instance of RuleBase. I ran the same test 5 times in a sequence, and the RuleBase instance was discarded right away. The test ran with different different number of packages, 20, 50, 100, and 200. The results are as the followings: Added 20 packages to rulebase in 0:00:0.15 Added 20 packages to rulebase in 0:00:0.21 Added 20 packages to rulebase in 0:00:0.21 Added 20 packages to rulebase in 0:00:0.301 Added 20 packages to rulebase in 0:00:0.18 Added 20 packages to rulebase 5 times in 0:00:1.051 Added 50 packages to rulebase in 0:00:0.17 Added 50 packages to rulebase in 0:00:1.422 Added 50 packages to rulebase in 0:00:1.252 Added 50 packages to rulebase in 0:00:1.322 Added 50 packages to rulebase in 0:00:1.331 Added 50 packages to rulebase 5 times in 0:00:5.497 Added 100 packages to rulebase in 0:00:0.19 Added 100 packages to rulebase in 0:00:5.278 Added 100 packages to rulebase in 0:00:5.297 Added 100 packages to rulebase in 0:00:5.228 Added 100 packages to rulebase in 0:00:5.327 Added 100 packages to rulebase 5 times in 0:00:21.32 Added 200 packages to rulebase in 0:00:0.22 Added 200 packages to rulebase in 0:00:21.691 Added 200 packages to rulebase in 0:00:21.481 Added 200 packages to rulebase in 0:00:21.642 Added 200 packages to rulebase in 0:00:21.341 Added 200 packages to rulebase 5 times in 0:01:26.385 As you can see, the timing of creating first RuleBase instance is always good, while the subsequent one's were very bad. Is there an attribute I could adjust in configuration to improve the performance for this scenario? Please advise if there is other alternatives. I would be glad to provide details if needed. The following test program would demonstrate the problem: import java.util.List; import java.util.ArrayList; import java.util.Random; import java.io.StringReader; import java.io.IOException; import org.drools.rule.Package; import org.drools.compiler.PackageBuilder; import org.drools.compiler.DroolsParserException; import org.drools.RuleBase; import org.drools.RuleBaseFactory; /** * Created by IntelliJ IDEA. User: SG0521861 Date: Aug 2, 2007 Time: 2:53:50 PM To change this template use File | * Settings | File Templates. */ public class TestDrools { private static final String ALPHABET= "abcdefghijklmnopqrstuvwxyz"; private static final String DRL_TEMPLATE = "package testpackage\n" + "import test.TestObject\n"+ "rule \"testrule_$1\"\n" + " when\n" + " h:TestObject(value1==\"$2\", value2 in (\"$3\"))\n" + " then\n" + " h.setResult(\"$4\");\n" + "end"; private int count; public TestDrools(int count) { this.count = count; } public void run() throws Exception { List<String> drls = generateDrls(); List<Package> pkgs = generatePackages(drls); for (int i = 0; i < 3; i++) { addPackages(pkgs, i+1); } } private static RuleBase addPackages(List<Package> pkgs, int id) throws Exception { long time = System.currentTimeMillis(); RuleBase rb = RuleBaseFactory.newRuleBase(); for (Package pkg : pkgs) rb.addPackage(pkg); System.out.println("Added "+pkgs.size()+" packages to rulebase"+id+" in "+ (System.currentTimeMillis()-time)/1000.0+" seconds"); return rb; } private List<String> generateDrls() { List<String> list = new ArrayList<String>(count); for (int i = 0; i < count; i++) { list.add(getDrl(i)); } return list; } private static List<Package> generatePackages(List<String> drls) throws DroolsParserException, IOException { List<Package> list = new ArrayList<Package>(drls.size()); for (String drl : drls) { PackageBuilder builder = new PackageBuilder(); builder.addPackageFromDrl(new StringReader(drl)); list.add(builder.getPackage()); } return list; } private String getDrl(int seed) { String drl = DRL_TEMPLATE.replace("$1", Integer.toString(seed)); drl = drl.replace("$2", getRandomString()); drl = drl.replace("$3", getRandomString()); return drl.replace("$4", getRandomString()); } private Random rand = new Random(); private String getRandomString() { StringBuilder sb = new StringBuilder(); for (int i = Math.abs(rand.nextInt() % 16) + 1; i-- > 0; ) sb.append(ALPHABET.charAt(Math.abs(rand.nextInt() % ALPHABET.length()))); return sb.toString(); } public static void main(String[] argv) { if (argv.length > 0) { try { new TestDrools(Integer.parseInt(argv[0])).run(); } catch (Exception ex) { ex.printStackTrace(); } } else System.out.println("Usage: TestDrool [# of packages]"); } } package test; /** * Created by IntelliJ IDEA. User: SG0521861 Date: Aug 2, 2007 Time: 3:38:13 PM To change this template use File | * Settings | File Templates. */ public class TestObject { private String value1; private String value2; private String result; public String getValue1() { return value1; } public void setValue1(String value1) { this.value1 = value1; } public String getValue2() { return value2; } public void setValue2(String value2) { this.value2 = value2; } public String getResult() { return result; } public void setResult(String result) { this.result = result; } }