Re: [rules-users] GC Overhead Limit Exceeded and 1B JoinLeftNode Objects

Ok, thanks. Here's what I have so far: 1) I am not retracting facts or setting expiration. This is by design since I am doing the next item. Do I need to retract globals? 2) I have disposed the session when I ran with a StatefulSession. I understood this means I do not need to retract facts. I do not attempt to reuse the session. I am now trying to use a StatelessSession. 3) Unfortunately, the rule base is very large and this will take a long time. I am hoping to at least get to a point where this runs end-to-end. If it takes several hours, I am ok with that. 4) I would expect everything except "eval" statements to take advantage of indexing in my rules. Are you talking about BetaNode indexing? In all cases, I use the property access over getters. 5) Since I am using a stateless session, I would expect no recursion. 6) Got it. Thanks. 7) Does this only apply with a shared KnowledgeBase? What if I spawn multiple sessions in separate threads? All in all, I reduced the allocated heap size and ran jmap as recommended by Wolfgang with a 6GB heap, 4 threads running sessions via a ForkJoinPool and less than 100K facts. Here is a snapshot of the top hits. I ran this multiple times, and just like JProfiler, the JoinNodeLeftTuple continue to grow and grow. I would expect this to fluctuate up and down in count and size since I am not re-using a session. Not being familiar with the internals of Drools, I am hoping someone could provide a sense of whether or not the below points to one of the issues Mark mentioned above. Also, during GC events only Eden space gets freed up so these objects appear to be living in Tenured space. This further concerns me that something is not being cleaned up. I fear it is all not so simple and will continue looking into Mark's list for opportunities in my code base as well as work towards simple test case. I appreciate all the time taken to read my rather lengthy emails. I am hoping that this detail will help others as it has me. Thank you. num #instances #bytes class name ---------------------------------------------- 1: 61754567 4940365360 org.drools.reteoo.JoinNodeLeftTuple 2: 1954644 109460064 org.drools.reteoo.RightTuple 3: 302247 24179760 org.drools.common.AgendaItem 4: 447814 21495072 com.mycompany.loader.FactsLoader <- A bunch of callable objects that get executed to load data to send to Drools when the processor(s) is (are) idle. 5: 302247 19343808 org.drools.reteoo.RuleTerminalNodeLeftTuple 6: 897091 14353456 java.lang.Integer 7: 447814 14330048 java.util.RandomAccessSubList 8: 300383 11743152 [C 9: 447815 10747560 java.util.Collections$SynchronizedRandomAccessList On Sat, Feb 23, 2013 at 5:57 PM, Julian Klein <julianklein(a)gmail.com&gt; wrote: