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Posted to dev@qpid.apache.org by GitBox <gi...@apache.org> on 2021/11/02 09:20:22 UTC
[GitHub] [qpid-jms] franz1981 edited a comment on pull request #44: QPIDJMS-552 JMS 2 Completion threads shouldn't scale with the number of sessions
franz1981 edited a comment on pull request #44:
URL: https://github.com/apache/qpid-jms/pull/44#issuecomment-957253435
I've sent a change that it's introducing `HolderSuppliers` (bad name, so happy to receive feedbacks/suggestions) and `SharedDisposable` as a util that could be used on https://github.com/apache/qpid-jms/pull/45 to handle shared disposable/pre-configured reference counted resources.
Some points re this change:
1. thanks to FJ work stealing having a thread busy/blocked processing completions isn't a big deal as long as other FJ threads can handle other sessions completions
2. fairness isn't still "right": a perfectly fair system should just process a single completion and continue on the FJ pool, to guarantee other completions to get their chance to get executed; I've chosen to execute burst of completions to amortize the "virtual context switch" cost, improving locality, but in theory would be better to cap (time based) for how much time a burst of completions should keep a single thread busy (a good number could be the N * default timeslack_ns of linux ie N* 50 us)
It can now save creating a number of completion threads that is bounded to the number of sessions, just by adding `completionThreads=N` to the qpid url
This is one run of the [previous benchmarks](https://github.com/apache/qpid-jms/pull/44#issuecomment-951904530) with `completionThreads=2`, in violet, the FJ pool (single) thread in action, with 89 + 88 = 177 samples:
```
-> TEST 16,959 msg/sec
-> TEST 17,391 msg/sec
-> TEST 16,986 msg/sec
-> TEST 17,377 msg/sec
-> TEST 16,997 msg/sec
-> TEST 17,415 msg/sec
-> TEST 16,978 msg/sec
-> TEST 17,379 msg/sec
-> TEST 16,987 msg/sec
-> TEST 17,385 msg/sec
-> * 171,857 msg/sec
```
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