[rules-users] permgen error for simple rule stress test

[anjana.ackroyd]

We are running a simple stress test (whose code I will paste below) for a
numbercompare rule file)
We get the following error before the test finishes. Which seems odd for one
rule
javax.servlet.ServletException: java.lang.OutOfMemoryError: PermGen space

This test is run against 3 loablanced tomcat servers 


Here is my JVM_OPTS for each of those tomcat 
JVM_OPTS="-Xms4096m -Xmx4096m -XX:NewSize=2048m -XX:PermSize=512m
-XX:MaxPermSize=512m -Xss1024K -XX:+UseCodeCacheFlushing
-XX:-UseSplitVerifier"

Here is 

I have a simple rule file deployed on guvnor on my abc with JVM_OPTS on the
guvnor being
JVM_OPTS="-Xms4096m -Xmx4096m -XX:NewSize=2048m -XX:PermSize=512m
-XX:MaxPermSize=512m -Xss1024K 




Here is my stress test that we are running

package DroolsTest;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
 
import confident.guppy.tools.Caller;
 
public class DroolsSpeedTest {
                
                public static void main(String[] args) {
                                HttpURLConnection httpURLConnection = null;
                                InputStream inputStream = null;
                                BufferedReader bufferedReader = null;
 
                                long t1 = System.currentTimeMillis();
                                for (int i = 0; i < 10000; i++) {
                                                try {
                                                                long start =
System.currentTimeMillis();
                                                                // Three
boxes
                                                                String url =
"https://abc-uat2.xyz.com/ces/v2.0/rules/10/compare/10";
                                                                
                                                                                          
                                                
                                                               
httpURLConnection = (HttpURLConnection) ( new URL(url).openConnection());
 
                                                                if
(httpURLConnection != null) {
                                                                               
inputStream = httpURLConnection.getInputStream();
                                                                               
bufferedReader = new BufferedReader(new InputStreamReader(
                                                                                                               
inputStream));
                                                                               
String results = "";
                                                                               
String info = "";
                                                                               
while ((info = bufferedReader.readLine()) != null) {
                                                                                               
results += info;
                                                                               
}
                                                                               
//caller.log(results);
                                                                } else {
                                                                               
System.out.println("Unable to create the HTTP connection with the required
server...");
                                                                }
 
                                                                if (i % 20
== 0 && i != 0 ) {
                                                                               
System.out.println(" passing " + i + "     ms " + (
System.currentTimeMillis() - start ));
                                                                }
 
                                                } catch (Exception boom) {
                                                               
boom.printStackTrace();
                                                               
System.out.println("It died on the " + i + " attempt because " +
boom.getMessage());
                                                }
                                }
                                long t2 = System.currentTimeMillis() - t1 ;
                                System.out.println("I took ms : "+  t2 );
                }
}




Here is my rules defined on guvnor 



package org.numbercompare;
declare NumberCompare
    message : String
    numberone: Integer
    numbertwo: Integer
end

rule "numberone is equals to numbertwo"

    when
        n: NumberCompare(numberone == numbertwo);

    then
        n.setMessage("numberone is equals to numbertwo");

end

rule "numberone is greater than numbertwo"
    when
        n: NumberCompare(numberone > numbertwo);

    then
        n.setMessage("numberone is greater than numbertwo");
end

rule "numberone is less than numbertwo"
    when
        n: NumberCompare(numberone < numbertwo);

    then
        n.setMessage("numberone is less than numbertwo");

end


Here is my code that updates the rule file



    public KnowledgeBase readKnowledgeBase() throws Exception {
         ResourceFactory.getResourceChangeNotifierService().start();
        ResourceFactory.getResourceChangeScannerService().start();
        ResourceChangeScannerConfiguration sconf =
ResourceFactory.getResourceChangeScannerService().newResourceChangeScannerConfiguration();
        sconf.setProperty("drools.resource.scanner.interval", "2");
        ResourceFactory.getResourceChangeScannerService().configure(sconf);
        KnowledgeAgentConfiguration kaconf =
KnowledgeAgentFactory.newKnowledgeAgentConfiguration();
        kaconf.setProperty("drools.agent.scanDirectories", "true");
        kaconf.setProperty("drools.agent.scanResources", "true");
        kaconf.setProperty("drools.agent.newInstance", "false");
        KnowledgeAgent kagent =
KnowledgeAgentFactory.newKnowledgeAgent("CS", kaconf);
       
kagent.applyChangeSet(ResourceFactory.newClassPathResource("ChangeSet.xml"));
        KnowledgeBase kbase = kagent.getKnowledgeBase();

        return kbase;
    }

    @Override
    public DroolsDTO getDroolsDTO(int numberone, int numbertwo) throws
Exception {
        DroolsDTO droolsDTO = new DroolsDTO();
        KnowledgeBase kb = readKnowledgeBase();
        FactType factType = kb.getFactType("org.numbercompare",
"NumberCompare");
        Object nc = factType.newInstance();
        factType.set(nc, "numberone", numberone);
        factType.set(nc, "numbertwo", numbertwo);
        StatefulKnowledgeSession ksession =
kb.newStatefulKnowledgeSession();
        ksession.insert(nc);
        ksession.fireAllRules();
        ksession.dispose();
        droolsDTO.setMessage(factType.get(nc, "message").toString());
        return droolsDTO;
    }


My changeset.xml
<change-set xmlns='http://drools.org/drools-5.0/change-set'
    xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'
    xs:schemaLocation='http://drools.org/drools-5.0/change-set
http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-api/src/main/resources/change-set-1.0.0.xsd'
>
    <add>
         <resource
source='http://abc:8082/guvnor/org.drools.guvnor.Guvnor/package/org.numbercompare/LATEST'
type='PKG' basicAuthentication="enabled" username="admin" password="admin"/>
    </add>
</change-set>







Also in the guvnor logs during the test I see 
, I see thousands of these: WARN 28-01 11:50:55,551
(RulesRepositoryManager.java:getRulesRepository:70) Creating RulesRepository
with default username. =============== session-guest-864931
and the session-guest numbers keep climbing.
and admin user logging in about every second.




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