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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 16:49:54 +03:00

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