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Richard van der Hoff 6a78ede569 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.	3 years ago
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synapse.html	Improve `reactor_tick_time` metric (#11724 )	3 years ago

Richard van der Hoff 6a78ede569

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.

3 years ago

synapse.html

Improve `reactor_tick_time` metric (#11724 )

3 years ago