Feature Requests item #454802, was opened at 2001-08-23 18:13 You can respond by visiting: http://sourceforge.net/tracker/?func=detail&atid=376688&aid=454802&group_id=22866 Category: None Group: None Status: Open Priority: 5 Submitted By: Doug Palmer (charvolant) Assigned to: Nobody/Anonymous (nobody) Summary: Performance decline/monitoring (x2) Initial Comment: A while back, I reported an odd decline in performance in JBoss when heavy loads were run. The first run would report fairly impressive throughput. Subsequent runs would then fall back to a (stable) lesser figure. http://www.jboss.org/forums/thread.jsp?forum=51&thread=536 has a discussion of this. At the time, it looked like the pool manager was the culprit. I've been experimenting with different management systems and collecting performance results. And it appears that I'm wrong; the pool behaviour is a symptom of something else happening withing JBoss. Fiddling with the logging has produced a minor improvement in performance, on the order of 5%. Different allocation schemes, including a straight mutexed free list, has no discernable impact on performance. So I've got no fix: Sorry 'bout that. I've been using the JBoss 2.5 source to do the testing. And I've also noticed a significant decline in throughput from 2.2.2 to 2.5. (This may be due to no profiling at this stage, though.) Using identical set-ups: 3 x dual 930 MHz systems for database (Oracle8/thin client) 100 clients and a version of the TPCC benchmark on stateless session beans. 200 beans in the pool and 30 database connections in the pool. 2.2.2 records a throughput of 630/530 transactions per second (first/subsequent run); 2.5 records a throughput of 510/420 TPS. So the "feature" I'm requesting is some performance monitoring. The decline in performance between fist/subsequent runs suggests that there's a resource leak somewhere. ---------------------------------------------------------------------- You can respond by visiting: http://sourceforge.net/tracker/?func=detail&atid=376688&aid=454802&group_id=22866 _______________________________________________ Jboss-development mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-development
