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Avoid forkserver method in OSX #3460

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mrocklin wants to merge 1 commit into from
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Avoid forkserver method in OSX #3460

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1 change: 1 addition & 0 deletions distributed/compatibility.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@

PYPY = platform.python_implementation().lower() == "pypy"
WINDOWS = sys.platform.startswith("win")
OSX = sys.platform == "darwin"

if sys.version_info[:2] >= (3, 7):
from asyncio import get_running_loop
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11 changes: 10 additions & 1 deletion distributed/utils.py
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Expand Up @@ -57,7 +57,7 @@
except ImportError:
PollIOLoop = None # dropped in tornado 6.0

from .compatibility import PYPY, WINDOWS, get_running_loop
from .compatibility import PYPY, OSX, WINDOWS, get_running_loop
from .metrics import time


Expand All @@ -77,6 +77,15 @@ def _initialize_mp_context():
return multiprocessing
else:
method = dask.config.get("distributed.worker.multiprocessing-method")
if method == "forkserver" and OSX:
logger.debug(
"forkserver multiprocessing method disabled on OSX. "
"Switching to spawn. "
"set `distributed.worker.multiprocessing-method` to spawn "
"to remove this warning. "
"https://docs.dask.org/en/latest/configuration.html"
)
method = "spawn"
ctx = multiprocessing.get_context(method)
# Makes the test suite much faster
preload = ["distributed"]
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