hoernschen/dendrite
1
0
Fork 0
mirror of https://github.com/hoernschen/dendrite.git synced 2025-07-31 13:22:46 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Optimise getting local members and membership counts (#3150)

Browse source 
The previous version was getting **ALL** membership events (as
`ClientEvents`, so going through `NewEventFromTrustedJSONWithID`) for a
given room.
Now we are querying only locally joined users as `ClientEvents`, which
should **significantly** reduce allocations.

Take for example a large room with 2k membership events, but only 1
local user - avoiding 1999 `NewEventFromTrustedJSONWithID` calls just to
calculate the `roomSize` which we can also query by other means.

This is also getting called for every `OutputRoomEvent` in the userAPI.

Benchmark with 1 local user and 100 remote users.
```
pkg: github.com/matrix-org/dendrite/userapi/consumers
cpu: 12th Gen Intel(R) Core(TM) i5-12500H
                    │   old.txt   │               new.txt               │
                    │   sec/op    │   sec/op     vs base                │
LocalRoomMembers-16   375.9µ ± 7%   327.6µ ± 6%  -12.85% (p=0.000 n=10)

                    │    old.txt    │               new.txt                │
                    │     B/op      │     B/op      vs base                │
LocalRoomMembers-16   79.426Ki ± 0%   8.507Ki ± 0%  -89.29% (p=0.000 n=10)

                    │   old.txt   │              new.txt               │
                    │  allocs/op  │ allocs/op   vs base                │
LocalRoomMembers-16   1015.0 ± 0%   277.0 ± 0%  -72.71% (p=0.000 n=10)
```
This commit is contained in:
Till 2023-07-13 14:19:08 +02:00 • committed by GitHub
parent f12982472c
commit 5267cc0f54
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
4 changed files with 109 additions and 19 deletions
Download patch file Download diff file Expand all files Collapse all files

14
roomserver/internal/query/query.go
View file

@ -974,6 +974,20 @@ func (r *Queryer) LocallyJoinedUsers(ctx context.Context, roomVersion gomatrixse
return joinedUsers, nil
}
func (r *Queryer) JoinedUserCount(ctx context.Context, roomID string) (int, error) {
info, err := r.DB.RoomInfo(ctx, roomID)
if err != nil {
return 0, err
}
if info == nil {
return 0, nil
}
// TODO: this can be further optimised by just using a SELECT COUNT query
nids, err := r.DB.GetMembershipEventNIDsForRoom(ctx, info.RoomNID, true, false)
return len(nids), err
}
// nolint:gocyclo
func (r *Queryer) QueryRestrictedJoinAllowed(ctx context.Context, roomID spec.RoomID, senderID spec.SenderID) (string, error) {
// Look up if we know anything about the room. If it doesn't exist