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authorErik Johnston <erik@matrix.org>2020-06-24 18:48:18 +0100
committerGitHub <noreply@github.com>2020-06-24 18:48:18 +0100
commit0e0a2817a29391fd777f7ee683dc03d63cf40302 (patch)
tree21897195e00b33db69bb0c220d9c6d2896bea9ce /synapse/handlers/acme.py
parentadd org.matrix.login.jwt so that m.login.jwt can be deprecated (#7675) (diff)
downloadsynapse-0e0a2817a29391fd777f7ee683dc03d63cf40302.tar.xz
Yield during large v2 state res. (#7735)
State res v2 across large data sets can be very CPU intensive, and if
all the relevant events are in the cache the algorithm will run from
start to finish within a single reactor tick. This can result in
blocking the reactor tick for several seconds, which can have major
repercussions on other requests.

To fix this we simply add the occaisonal `sleep(0)` during iterations to
yield execution until the next reactor tick. The aim is to only do this
for large data sets so that we don't impact otherwise quick resolutions.=
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