[jboss-jira] [JBoss JIRA] Created: (JBRULES-1056) Performance of RuleBase().addPackage(.) goes down on sub sequent instances of RuleBase with large number of packages.
Ming Jin (JIRA)
jira-events at lists.jboss.org
Thu Aug 2 17:08:59 EDT 2007
Performance of RuleBase().addPackage(.) goes down on sub sequent instances of RuleBase with large number of packages.
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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
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; }
}
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