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[Test] Fix test_num_threads that instantiate the env in the main process #3283

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Merged
vmoens merged 1 commit into from
Jan 1, 2026
Merged

[Test] Fix test_num_threads that instantiate the env in the main process #3283

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11 changes: 8 additions & 3 deletions test/test_envs.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3418,13 +3418,18 @@ class TestLibThreading:
def test_num_threads(self):
gc.collect()
num_threads = torch.get_num_threads()
main_pid = os.getpid()
try:
# Wrap the env factory to check thread count inside the subprocess.
# The env is created AFTER torch.set_num_threads() is called in the worker.
# Note: the factory is also called in the main process to get metadata,
# so we only check thread count when running in a subprocess.
def make_env():
assert (
torch.get_num_threads() == 3
), f"Expected 3 threads, got {torch.get_num_threads()}"
if os.getpid() != main_pid:
# Only check thread count in subprocess, not during metadata extraction
assert (
torch.get_num_threads() == 3
), f"Expected 3 threads, got {torch.get_num_threads()}"
return ContinuousActionVecMockEnv()

env = ParallelEnv(2, make_env, num_sub_threads=3, num_threads=7)
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