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| author | Mathieu Velten <matmaul@gmail.com> | 2024-03-14 14:49:54 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2024-03-14 13:49:54 +0000 |
| commit | cb562d73aaa592c05b96672724ba296d02cee896 (patch) | |
| tree | eead02d23e1dbb580e0a7410894be84d02d70ddb /docs/metrics-howto.md | |
| parent | Bump types-psycopg2 from 2.9.21.16 to 2.9.21.20240311 (#16995) (diff) | |
| download | synapse-cb562d73aaa592c05b96672724ba296d02cee896.tar.xz | |
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.
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