synapse/changelog.d/16840.misc at 1c1b0bfa778e32bf740469b0a86be55102bc01b4 - mirrors/synapse - Sadium Git

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Mathieu Velten cb562d73aa

Improve lock performance when a lot of locks are waiting (#16840 )

When a lot of locks are waiting for a single lock, notifying all locks
independently with `call_later` on each release is really costly and
incurs some kind of async contention, where the CPU is spinning a lot
for not much.

The included test is taking around 30s before the change, and 0.5s
after.

It was found following failing tests with
https://github.com/element-hq/synapse/pull/16827.

2024-03-14 13:49:54 +00:00

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Improve lock performance when a lot of locks are all waiting for a single lock to be released.