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Skip the final GC on shutdown to improve restart times (#10712)

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Use `gc.freeze()` on exit to exclude all existing objects from the final GC.
In testing, this sped up shutdown by up to a few seconds.

`gc.freeze()` runs in constant time, so there is little chance of performance
regression.

Signed-off-by: Sean Quah <seanq@element.io>
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Sean 2021-09-01 11:55:31 +01:00 • committed by GitHub
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commit f8bf83b811
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1
changelog.d/10712.feature Normal file
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@ -0,0 +1 @@
Skip final GC at shutdown to improve restart performance.

7
synapse/app/_base.py
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@ -12,6 +12,7 @@
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and # See the License for the specific language governing permissions and
# limitations under the License. # limitations under the License.
import atexit
import gc import gc
import logging import logging
import os import os
@ -403,6 +404,12 @@ async def start(hs: "HomeServer"):
gc.collect() gc.collect()
gc.freeze() gc.freeze()
# Speed up shutdowns by freezing all allocated objects. This moves everything
# into the permanent generation and excludes them from the final GC.
# Unfortunately only works on Python 3.7
if platform.python_implementation() == "CPython" and sys.version_info >= (3, 7):
atexit.register(gc.freeze)
def setup_sentry(hs): def setup_sentry(hs):
"""Enable sentry integration, if enabled in configuration """Enable sentry integration, if enabled in configuration