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author | Richard van der Hoff <1389908+richvdh@users.noreply.github.com> | 2022-01-17 12:14:40 +0000 |
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committer | GitHub <noreply@github.com> | 2022-01-17 12:14:40 +0000 |
commit | 6a78ede56932b486c0ca3cc7c6edd84a2f373366 (patch) | |
tree | dcfe2e7e2ba0acf0f7e23a741b5b4b8333e12f8e /changelog.d/11742.misc | |
parent | Make pagination of rooms in admin api stable (#11737) (diff) | |
download | synapse-6a78ede56932b486c0ca3cc7c6edd84a2f373366.tar.xz |
Improve `reactor_tick_time` metric (#11724)
The existing implementation of the `python_twisted_reactor_tick_time` metric is pretty useless, because it *only* measures the time taken to execute timed calls and callbacks from threads. That neglects everything that happens off the back of I/O, which is obviously quite a lot for us. To improve this, I've hooked into a different place in the reactor - in particular, where it calls `epoll`. That call is the only place it should wait for something to happen - the rest of the loop *should* be quick. I've also removed `python_twisted_reactor_pending_calls`, because I don't believe anyone ever looks at it, and it's a nuisance to populate.
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