From 0b91ccce47bd821ed69ea2628f80c98f83981033 Mon Sep 17 00:00:00 2001 From: Erik Johnston Date: Tue, 14 May 2024 14:39:04 +0100 Subject: Improve perf of sync device lists (#17191) It's almost always more efficient to query the rooms that have device list changes, rather than looking at the list of all users whose devices have changed and then look for shared rooms. --- synapse/handlers/sync.py | 37 ++++++------------------------------- 1 file changed, 6 insertions(+), 31 deletions(-) (limited to 'synapse/handlers/sync.py') diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py index 8ff45a3353..0bef58351c 100644 --- a/synapse/handlers/sync.py +++ b/synapse/handlers/sync.py @@ -1803,38 +1803,13 @@ class SyncHandler: # Step 1a, check for changes in devices of users we share a room # with - # - # We do this in two different ways depending on what we have cached. - # If we already have a list of all the user that have changed since - # the last sync then it's likely more efficient to compare the rooms - # they're in with the rooms the syncing user is in. - # - # If we don't have that info cached then we get all the users that - # share a room with our user and check if those users have changed. - cache_result = self.store.get_cached_device_list_changes( - since_token.device_list_key - ) - if cache_result.hit: - changed_users = cache_result.entities - - result = await self.store.get_rooms_for_users(changed_users) - - for changed_user_id, entries in result.items(): - # Check if the changed user shares any rooms with the user, - # or if the changed user is the syncing user (as we always - # want to include device list updates of their own devices). - if user_id == changed_user_id or any( - rid in joined_rooms for rid in entries - ): - users_that_have_changed.add(changed_user_id) - else: - users_that_have_changed = ( - await self._device_handler.get_device_changes_in_shared_rooms( - user_id, - sync_result_builder.joined_room_ids, - from_token=since_token, - ) + users_that_have_changed = ( + await self._device_handler.get_device_changes_in_shared_rooms( + user_id, + sync_result_builder.joined_room_ids, + from_token=since_token, ) + ) # Step 1b, check for newly joined rooms for room_id in newly_joined_rooms: -- cgit 1.5.1