24 lines
1.2 KiB
Python
24 lines
1.2 KiB
Python
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from torch._C._distributed_c10d import _DEFAULT_PG_TIMEOUT
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from datetime import timedelta
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from typing import Optional
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__all__ = ['default_pg_timeout', 'default_pg_nccl_timeout']
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# Default process group wide timeout, if applicable.
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# This only applies to the non-nccl backends
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# To make an attempt at backwards compatibility with THD, we use an
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# extraordinarily high default timeout, given that THD did not have timeouts.
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default_pg_timeout: timedelta = _DEFAULT_PG_TIMEOUT
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# Separate timeout for PGNCCL mainly becuase it's always been that way in the C++ layer, but until recently
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# there was one default that applied across all backends in the python layer.
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# Later, we could consider merging them back together at the c++ layer if we can align on a same value.
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# (only if TORCH_NCCL_BLOCKING_WAIT or TORCH_NCCL_ASYNC_ERROR_HANDLING is set to 1).
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try:
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from torch._C._distributed_c10d import _DEFAULT_PG_NCCL_TIMEOUT
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default_pg_nccl_timeout: Optional[timedelta] = _DEFAULT_PG_NCCL_TIMEOUT
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except ImportError:
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# if C++ NCCL support is not compiled, we don't have access to the default nccl value.
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# if anyone is actually trying to use nccl in this state, it should error.
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default_pg_nccl_timeout = None
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