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authorErik Johnston <erik@matrix.org>2017-05-17 14:31:23 +0100
committerErik Johnston <erik@matrix.org>2017-05-17 15:12:15 +0100
commitbbfe4e996c9b9729f19d5b104dc6abfe120531b4 (patch)
tree899deacf0159b07f84271abdb58c6ca4b02677c6 /jenkins-flake8.sh
parentMerge branch 'release-v0.21.0' of github.com:matrix-org/synapse into develop (diff)
downloadsynapse-bbfe4e996c9b9729f19d5b104dc6abfe120531b4.tar.xz
Make get_state_groups_from_groups faster.
Most of the time was spent copying a dict to filter out sentinel values
that indicated that keys did not exist in the dict. The sentinel values
were added to ensure that we cached the non-existence of keys.

By updating DictionaryCache to keep track of which keys were known to
not exist itself we can remove a dictionary copy.
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