3 people 0bd28389b1 Improve caching for presence (#19939) ...

This does two things, first it adds a config flag to ignore rooms for
the purposes of presence routing.

Secondly, it changes the caching behaviour to try and improve the cache
hit ratio. Previously, the size of the `do_users_share_a_room` cache
(which stores pairs of users) needs to `O(n²)` for the number of online
users, which is infeasible for large servers.

Instead, we call `get_users_in_room` for both the syncing and updated
users. This sounds more expensive, but a) we will already have cached
the syncing user's rooms, and b) we will only calculate the updated
user's rooms once (rather than once per syncing user).

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Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

2026-07-13 09:34:07 +01:00

..

v1

Machine-readable config description (#17892)

2025-06-03 10:29:38 +01:00

synapse-config.schema.yaml

Improve caching for presence (#19939)

2026-07-13 09:34:07 +01:00