[jboss-jira] [JBoss JIRA] (DROOLS-3412) Performance degradation with session pools

Performance degradation with session pools ------------------------------------------ Key: DROOLS-3412 URL: https://issues.jboss.org/browse/DROOLS-3412 Project: Drools Issue Type: Bug Reporter: Christian Liebhardt Assignee: Mario Fusco Priority: Major Attachments: gc.png Hello, We've today updates to Drools 7.15 and as discussed with DROOLS-3228 we changed our code from calling _StatefulKnowledgeSessionImpl.reset_ ourselves to _KieSessionsPool_. However we then recognized that our application quickly became slower and slower over time (roughly after a few minutes of uptime, or a couple of hundred session create/dispose cycles). I haven't yet found the reason what is causing the slow down. However I think there is a difference in how we reset our sessions before session pools and how session pools do it. Perhaps that is a lead. *What we did* # Create a session # Use the session # Dispose and reset the session and go back to 2 for the next facts *What happens with session pools* # Create a session # Use the session # Skip dispose (because of _pool != null_ in the dispose method), reset the session and go back to 2 for the next facts So the difference seems to be that with session pools the session doesn't get disposed before reset it called. If I do the same without session pools then I also see the same slow down. So it seems that something is left behind and causes a slow down. The results however seem to be correct, so the right consequences appear to be triggered. An example on how we use the session pool can be found here: https://github.com/liebharc/JavaRules/blob/master/src/main/java/com/githu... Thanks once more for your help.