String intern
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fbdeb1778d
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2 changed files with 17 additions and 3 deletions
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@ -15,6 +15,7 @@
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from ._base import SQLBaseStore
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from synapse.util.caches.descriptors import cached, cachedList
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from synapse.util.caches import intern_string
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from twisted.internet import defer
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@ -155,7 +156,9 @@ class StateStore(SQLBaseStore):
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@defer.inlineCallbacks
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def get_current_state_for_key(self, room_id, event_type, state_key):
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event_ids = yield self._get_current_state_for_key(room_id, event_type, state_key)
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event_ids = yield self._get_current_state_for_key(
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room_id, intern_string(event_type), intern_string(state_key)
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)
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events = yield self._get_events(event_ids, get_prev_content=False)
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defer.returnValue(events)
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@ -202,7 +205,7 @@ class StateStore(SQLBaseStore):
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results = {}
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for row in rows:
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key = (row["type"], row["state_key"])
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key = (intern_string(row["type"]), intern_string(row["state_key"]))
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results.setdefault(row["state_group"], {})[key] = row["event_id"]
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return results
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@ -393,7 +396,10 @@ class StateStore(SQLBaseStore):
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# cache absence of the key, on the assumption that if we've
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# explicitly asked for some types then we will probably ask
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# for them again.
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state_dict = {key: None for key in types}
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state_dict = {
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(intern_string(etype), intern_string(state_key)): None
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for (etype, state_key) in types
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}
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state_dict.update(results[group])
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results[group] = state_dict
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else:
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@ -14,6 +14,7 @@
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# limitations under the License.
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import synapse.metrics
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from lrucache import LruCache
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DEBUG_CACHES = False
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@ -25,3 +26,10 @@ cache_counter = metrics.register_cache(
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lambda: {(name,): len(caches_by_name[name]) for name in caches_by_name.keys()},
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labels=["name"],
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)
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_string_cache = LruCache(5000)
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caches_by_name["string_cache"] = _string_cache
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def intern_string(string):
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return _string_cache.setdefault(string, string)
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