From fc87d2ffb39ca17065e19bd42ef25f1c84862d2c Mon Sep 17 00:00:00 2001 From: Erik Johnston Date: Wed, 19 Feb 2020 15:09:00 +0000 Subject: [PATCH] Freeze allocated objects on startup. (#6953) This may make gc go a bit faster as the gc will know things like caches/data stores etc. are frozen without having to check. --- changelog.d/6953.misc | 1 + synapse/app/_base.py | 9 +++++++++ 2 files changed, 10 insertions(+) create mode 100644 changelog.d/6953.misc diff --git a/changelog.d/6953.misc b/changelog.d/6953.misc new file mode 100644 index 000000000..0ab52041c --- /dev/null +++ b/changelog.d/6953.misc @@ -0,0 +1 @@ +Reduce time spent doing GC by freezing objects on startup. diff --git a/synapse/app/_base.py b/synapse/app/_base.py index 0e8b467a3..109b1e2fb 100644 --- a/synapse/app/_base.py +++ b/synapse/app/_base.py @@ -279,6 +279,15 @@ def start(hs, listeners=None): setup_sentry(hs) setup_sdnotify(hs) + + # We now freeze all allocated objects in the hopes that (almost) + # everything currently allocated are things that will be used for the + # rest of time. Doing so means less work each GC (hopefully). + # + # This only works on Python 3.7 + if sys.version_info >= (3, 7): + gc.collect() + gc.freeze() except Exception: traceback.print_exc(file=sys.stderr) reactor = hs.get_reactor()