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Use spawn for multiprocessing start method #3284

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Use spawn for multiprocessing start method #3284

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9 changes: 8 additions & 1 deletion torchrec/distributed/test_utils/multi_process.py
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Original file line number Diff line number Diff line change
Expand Up @@ -107,9 +107,16 @@ def __init__(
) -> None:
super().__init__(methodName)

# In CUDA 12.8 we're seeing hangs from using forkserver, so we're
# switching to spawn.
# AMD's HIP runtime doesn't seem to work with forkserver; hipMalloc will fail
# Therefore we use spawn for HIP runtime until AMD fixes the issue
self._mp_init_mode: str = mp_init_mode if torch.version.hip is None else "spawn"
if (
torch.version.cuda is not None and torch.version.cuda >= "12.8"
) or torch.version.hip is not None:
self._mp_init_mode: str = "spawn"
else:
self._mp_init_mode: str = mp_init_mode
logging.info(f"Using {self._mp_init_mode} for multiprocessing")

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