Synapse 0.14 is released!

We just released Synapse 0.14.0 - a major update which incorporates lots of work on making Synapse more RAM efficient. There's still a lot of room for further improvements, but the main headlines are reducing the resident memory footprint dramatically by interning strings and deduplicating events across the many different caches. It also adds a much-needed SYNAPSE_CACHE_FACTOR environment variable that can be used to globally decrease or increase the sizing of all of Synapse's various caches (with an associated slow-down or speed-up in performance). Quite how improved the new memory footprint seems to very much depend on your own use case, but it's certainly a step in the right direction.

For more details on recent Synapse performance work (and a general state of the union for the whole Matrix ecosystem), check out our Spring update.

Get all new synapse from https://github.com/matrix-org/synapse - we recommend upgrading (or installing!) asap :)

Full changelog follows:

Changes in synapse v0.14.0 (2016-03-30)

No changes from v0.14.0-rc2

Changes in synapse v0.14.0-rc2 (2016-03-23)

Features:

• Add published room list API (PR #657)

Changes:

• Change various caches to consume less memory (PR #656, #658, #660, #662, #663, #665)
• Allow rooms to be published without requiring an alias (PR #664)
• Intern common strings in caches to reduce memory footprint (#666)

Bug fixes:

• Fix reject invites over federation (PR #646)
• Fix bug where registration was not idempotent (PR #649)
• Update aliases event after deleting aliases (PR #652)
• Fix unread notification count, which was sometimes wrong (PR #661)

Changes in synapse v0.14.0-rc1 (2016-03-14)

Features:

• Add event_id to response to state event PUT (PR #581)
• Allow guest users access to messages in rooms they have joined (PR #587)
• Add config for what state is included in a room invite (PR #598)
• Send the inviter's member event in room invite state (PR #607)
• Add error codes for malformed/bad JSON in /login (PR #608)
• Add support for changing the actions for default rules (PR #609)
• Add environment variable SYNAPSE_CACHE_FACTOR, default it to 0.1 (PR #612)
• Add ability for alias creators to delete aliases (PR #614)
• Add profile information to invites (PR #624)

Changes:

• Enforce user_id exclusivity for AS registrations (PR #572)
• Make adding push rules idempotent (PR #587)
• Improve presence performance (PR #582, #586)
• Change presence semantics for last_active_ago (PR #582, #586)
• Don't allow m.room.create to be changed (PR #596)
• Add 800x600 to default list of valid thumbnail sizes (PR #616)
• Always include kicks and bans in full /sync (PR #625)
• Send history visibility on boundary changes (PR #626)
• Register endpoint now returns a refresh_token (PR #637)

Bug fixes:

• Fix bug where we returned incorrect state in /sync (PR #573)
• Always return a JSON object from push rule API (PR #606)
• Fix bug where registering without a user id sometimes failed (PR #610)
• Report size of ExpiringCache in cache size metrics (PR #611)
• Fix rejection of invites to empty rooms (PR #615)
• Fix usage of bcrypt to not use checkpw (PR #619)
• Pin pysaml2 dependency (PR #634)
• Fix bug in /sync where timeline order was incorrect for backfilled events (PR #635)