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authorRichard van der Hoff <richard@matrix.org>2018-07-12 11:37:44 +0100
committerRichard van der Hoff <richard@matrix.org>2018-07-12 11:37:44 +0100
commitfa5c2bc082185580e7d65a8759a8b5213933a137 (patch)
treed17427df60d28be7fabed6f6ecf0de5dc2a05c5f /contrib
parentMerge pull request #3505 from matrix-org/erikj/receipts_cahce (diff)
downloadsynapse-fa5c2bc082185580e7d65a8759a8b5213933a137.tar.xz
Reduce set building in get_entities_changed
This line shows up as about 5% of cpu time on a synchrotron:

    not_known_entities = set(entities) - set(self._entity_to_key)

Presumably the problem here is that _entity_to_key can be largeish, and
building a set for its keys every time this function is called is slow.

Here we rewrite the logic to avoid building so many sets.
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