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Hot idling when in subthread (runserver)

See original GitHub issue

When Daphne is embedded as a subthread inside something else (such as channels’ runserver) it idles very hot, using a full CPU core on my machine, even with a Twisted-native ASGI backend.

It looks like the Twisted reactor might be the cause, but can’t be sure yet.

Issue Analytics

State:
Created 7 years ago
Comments:19 (8 by maintainers)

Top GitHub Comments

3reactions

andrewgodwincommented, Feb 23, 2017

It’s partially a problem with the synchronous polling, yes - I’m working on fixing that soon. It’s also something else, though, because calling epoll 100 times a second should not cause a lot of load. If you look at the output from @cbay you can see it’s polling far more than it’s talking to Redis.

I’m not sure why this is, but I need to sit down and sort this out, make IPC more efficient, and probably redesign the way daphne handles socket listening entirely.

0reactions

andrewgodwincommented, Feb 2, 2018

Hot idling is gone with daphne 2 as it’s all asyncio now.