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authorAmber Brown <hawkowl@atleastfornow.net>2018-06-28 11:04:18 +0100
committerGitHub <noreply@github.com>2018-06-28 11:04:18 +0100
commit72d2143ea8fe43464b1db59936acef53293b1b2a (patch)
tree06a27dc808cb5696e953671a13910fade4881b4e
parentBetter testing framework for homeserver-using things (#3446) (diff)
downloadsynapse-72d2143ea8fe43464b1db59936acef53293b1b2a.tar.xz
Revert "Revert "Try to not use as much CPU in the StreamChangeCache"" (#3454)
-rw-r--r--changelog.d/3447.misc0
-rw-r--r--synapse/util/caches/stream_change_cache.py6
2 files changed, 4 insertions, 2 deletions
diff --git a/changelog.d/3447.misc b/changelog.d/3447.misc
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/changelog.d/3447.misc
diff --git a/synapse/util/caches/stream_change_cache.py b/synapse/util/caches/stream_change_cache.py
index 817118e30f..0fb8620001 100644
--- a/synapse/util/caches/stream_change_cache.py
+++ b/synapse/util/caches/stream_change_cache.py
@@ -78,7 +78,8 @@ class StreamChangeCache(object):
             not_known_entities = set(entities) - set(self._entity_to_key)
 
             result = (
-                set(self._cache.values()[self._cache.bisect_right(stream_pos) :])
+                {self._cache[k] for k in self._cache.islice(
+                    start=self._cache.bisect_right(stream_pos))}
                 .intersection(entities)
                 .union(not_known_entities)
             )
@@ -113,7 +114,8 @@ class StreamChangeCache(object):
         assert type(stream_pos) is int
 
         if stream_pos >= self._earliest_known_stream_pos:
-            return self._cache.values()[self._cache.bisect_right(stream_pos) :]
+            return [self._cache[k] for k in self._cache.islice(
+                start=self._cache.bisect_right(stream_pos))]
         else:
             return None