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Switch threading model to fork on macOS #8347

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Switch threading model to fork on macOS #8347

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16 changes: 16 additions & 0 deletions python/tvm/driver/tvmc/main.py
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,9 @@

from tvm.driver.tvmc.common import TVMCException

import multiprocessing as mp
from sys import platform
import os

REGISTERED_PARSER = []

Expand Down Expand Up @@ -91,6 +94,19 @@ def _main(argv):


def main():
if platform == "darwin":
# This fixes a crash on macOS. Note, that for tvmc to run
# safely on macOS the user needs to set the environment variable
# OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES _before_ the process
# is run. See this analysis for more information:
# https://wefearchange.org/2018/11/forkmacos.rst.html
mp.set_start_method("fork", force=True)
if os.environ.get("OBJC_DISABLE_INITIALIZE_FORK_SAFETY") != "YES":
sys.stderr.write("We suggest you set the environment variable\n"
"OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES\n"
"when running tvmc on macOS. More details here: "
"https://wefearchange.org/2018/11/forkmacos.rst.html")

sys.exit(_main(sys.argv[1:]))


Expand Down