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String intern

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This commit is contained in:
Erik Johnston 2016-03-22 18:22:52 +00:00
parent fbdeb1778d
commit 75daede92f
2 changed files with 17 additions and 3 deletions
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12
synapse/storage/state.py
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@ -15,6 +15,7 @@
from ._base import SQLBaseStore
from synapse.util.caches.descriptors import cached, cachedList
from synapse.util.caches import intern_string
from twisted.internet import defer
@ -155,7 +156,9 @@ class StateStore(SQLBaseStore):
@defer.inlineCallbacks
def get_current_state_for_key(self, room_id, event_type, state_key):
event_ids = yield self._get_current_state_for_key(room_id, event_type, state_key)
event_ids = yield self._get_current_state_for_key(
room_id, intern_string(event_type), intern_string(state_key)
)
events = yield self._get_events(event_ids, get_prev_content=False)
defer.returnValue(events)
@ -202,7 +205,7 @@ class StateStore(SQLBaseStore):
results = {}
for row in rows:
key = (row["type"], row["state_key"])
key = (intern_string(row["type"]), intern_string(row["state_key"]))
results.setdefault(row["state_group"], {})[key] = row["event_id"]
return results
@ -393,7 +396,10 @@ class StateStore(SQLBaseStore):
# cache absence of the key, on the assumption that if we've
# explicitly asked for some types then we will probably ask
# for them again.
state_dict = {key: None for key in types}
state_dict = {
(intern_string(etype), intern_string(state_key)): None
for (etype, state_key) in types
}
state_dict.update(results[group])
results[group] = state_dict
else:

8
synapse/util/caches/__init__.py
View file

@ -14,6 +14,7 @@
# limitations under the License.
import synapse.metrics
from lrucache import LruCache
DEBUG_CACHES = False
@ -25,3 +26,10 @@ cache_counter = metrics.register_cache(
lambda: {(name,): len(caches_by_name[name]) for name in caches_by_name.keys()},
labels=["name"],
)
_string_cache = LruCache(5000)
caches_by_name["string_cache"] = _string_cache
def intern_string(string):
return _string_cache.setdefault(string, string)