mwashburn2 commented on PR #2276: URL: https://github.com/apache/activemq/pull/2276#issuecomment-6195426135
### Production evidence (5.18.x pre change, 64 cores, ~600 transport threads, mostly non-persistent topics) Five thread dumps were taken about 30s apart. The global `MemoryUsage` RRWL was the dominant contention point in every one: | Dump | Threads parked on global usage RRWL | Threads parked on queue cursor RRWLs (holders blocked on the global lock) | |---|---|---| | 1 | 49 | 15 | | 2 | 34 | 2 | | 3 | 26 | 45 | | 4 | 60 | 26 | | 5 | 58 | 8 | Breakdown from one dump, by operation on the lock: | Operation | Waiters | |---|---| | `isFull` ← `Topic.send` | 38 | | `isFull` ← `Queue.send` | 9 | | `decreaseUsage` ← `decrementReferenceCount` | 7 | | `increaseUsage` ← `incrementReferenceCount` | 3 | | `getPercentUsage` ← `isParentFull` | 3 | -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected] For further information, visit: https://activemq.apache.org/contact
