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Make executor max_workers consistent between python versions (#38821)

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The default on python 3.8 is for max_workers is significantly
lower than the default on python 3.7 which means we can get starved
for workers.

To determine a reasonable maximum, the maximum was increased to large
number on 5 production instances.

The number of worker threads created during startup that were
needed to avoid waiting for a thread:

  HOU 1 - 71
  HOU 2 - 48
  OGG 1 - 60
  OGG 2 - 68
  OGG 3 - 64

This lead to a selection of 64 as it was reliable in all cases
and did not have a significant memory impact
This commit is contained in:
J. Nick Koston 2020-08-13 03:12:18 -05:00 committed by GitHub
parent 3957337b9f
commit a6cec21c43
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1 changed files with 15 additions and 1 deletions
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16
homeassistant/runner.py
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@ -11,6 +11,18 @@ from homeassistant import bootstrap
from homeassistant.core import callback
from homeassistant.helpers.frame import warn_use
#
# Python 3.8 has significantly less workers by default
# than Python 3.7. In order to be consistent between
# supported versions, we need to set max_workers.
#
# In most cases the workers are not I/O bound, as they
# are sleeping/blocking waiting for data from integrations
# updating so this number should be higher than the default
# use case.
#
MAX_EXECUTOR_WORKERS = 64
@dataclasses.dataclass
class RuntimeConfig:
@ -57,7 +69,9 @@ class HassEventLoopPolicy(PolicyBase): # type: ignore
if self.debug:
loop.set_debug(True)
executor = ThreadPoolExecutor(thread_name_prefix="SyncWorker")
executor = ThreadPoolExecutor(
thread_name_prefix="SyncWorker", max_workers=MAX_EXECUTOR_WORKERS
)
loop.set_default_executor(executor)
loop.set_default_executor = warn_use( # type: ignore
loop.set_default_executor, "sets default executor on the event loop"