Hi, I have written a Java application that reads in approximately 6000 .dslr rules at runtime. This takes around 6minutes, however I have installed the application on the target (rather old!) machine and load time is in excess of 20minutes. I have been trying without success to find a way to speed up loading: I have tried: 1. Serialising the KnowledgePackages themselves. This works well but has limited effect on load time. 2. Serialising the KnowledgeBase, this does not seem to work on large rule bases and fails with StackOverflowException when I load more than about 200 rules. 3. Serialising the StatefulKnowledgeSession using Marshaller marshaller = MarshallerFactory.newMarshaller(knowledgeBase); marshaller.marshall(out, session); This works well for the life of the marshaller but does not solve my problem as I need to restart the application and therefore cannot use the same instance of marshaller later on. Marshaller is not serialisable. I know some of these points are discussed in other posts. But is there anything I can do or have I missed the point? Any help or comments very much appreciated, Regards, Jen -- View this message in context: http://www.nabble.com/Failing-serialisation-of-large-rule-base-tp24444231... Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Hi Michal, With regard to point 2, the StackOverflowException was thrown based on standard Java stack size and not from within the DroolsObject stream as I thought. Increasing the stack size allowed me to serialise the full KnowledgeBase with noticable speed results. I am keen to do things 'properly' though so on to point 3.... The method 'createSerializableMarshaller' in MarshallingTest.java takes a KnowledgeBase as parameter. So I create a Marshaller and .marshall the StatefulKnowledgeSession. No problems. Then to unmarshall I create a new Marshaller? but I no longer have the same knowledgeBase and a null pointer exception is thrown when I use marshaller.unmarshall. java.lang.NullPointerException at org.drools.common.ConcurrentNodeMemories.getNodeMemory(ConcurrentNodeMemories.java:69) at org.drools.common.AbstractWorkingMemory.getNodeMemory(AbstractWorkingMemory.java:1534) at org.drools.marshalling.impl.InputMarshaller.readFactHandles(InputMarshaller.java:334) at org.drools.marshalling.impl.InputMarshaller.readSession(InputMarshaller.java:207) at org.drools.marshalling.impl.DefaultMarshaller.unmarshall(DefaultMarshaller.java:75) at org.drools.marshalling.impl.DefaultMarshaller.unmarshall(DefaultMarshaller.java:47) Or am I misunderstanding... should I be able to serialise the Marshaller created in createSerializableMarshaller? This would make sense by the name!! How do I serialise it? DroolsObjectOutputStream? Regards, Jen Michal Bali-2 wrote: > > Hi Jen, > > To answer your 3. point. You can create a serializable marshaller like > this: > > MarshallerFactory.newSerializeMarshallingStrategy( acceptor ); > > You can find complete examples here: > http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-compiler... > > Best regards, > Michal > > > On Sat, Jul 11, 2009 at 11:55 PM, LadyCode <j_whittlesea(a)hotmail.com&gt; > wrote: > >> >> Hi, >> >> I have written a Java application that reads in approximately 6000 .dslr >> rules at runtime. This takes around 6minutes, however I have installed >> the >> application on the target (rather old!) machine and load time is in >> excess >> of 20minutes. I have been trying without success to find a way to speed >> up >> loading: >> >> I have tried: >> >> 1. Serialising the KnowledgePackages themselves. This works well but has >> limited effect on load time. >> 2. Serialising the KnowledgeBase, this does not seem to work on large >> rule >> bases and fails with StackOverflowException when I load more than about >> 200 >> rules. >> 3. Serialising the StatefulKnowledgeSession using >> >> Marshaller marshaller = MarshallerFactory.newMarshaller(knowledgeBase); >> marshaller.marshall(out, session); >> >> This works well for the life of the marshaller but does not solve my >> problem >> as I need to restart the application and therefore cannot use the same >> instance of marshaller later on. Marshaller is not serialisable. >> >> I know some of these points are discussed in other posts. But is there >> anything I can do or have I missed the point? >> >> Any help or comments very much appreciated, >> >> Regards, >> Jen >> -- >> View this message in context: >> http://www.nabble.com/Failing-serialisation-of-large-rule-base-tp24444231... >> Sent from the drools - user mailing list archive at Nabble.com. >> >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users >> > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > -- View this message in context: http://www.nabble.com/Failing-serialisation-of-large-rule-base-tp24444231... Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users