79 lines
2.4 KiB
Python
79 lines
2.4 KiB
Python
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"""torch.multiprocessing is a wrapper around the native :mod:`multiprocessing` module.
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It registers custom reducers, that use shared memory to provide shared
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views on the same data in different processes. Once the tensor/storage is moved
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to shared_memory (see :func:`~torch.Tensor.share_memory_`), it will be possible
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to send it to other processes without making any copies.
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The API is 100% compatible with the original module - it's enough to change
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``import multiprocessing`` to ``import torch.multiprocessing`` to have all the
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tensors sent through the queues or shared via other mechanisms, moved to shared
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memory.
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Because of the similarity of APIs we do not document most of this package
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contents, and we recommend referring to very good docs of the original module.
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"""
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import multiprocessing
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import sys
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import torch
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from .reductions import init_reductions
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__all__ = ["set_sharing_strategy", "get_sharing_strategy", "get_all_sharing_strategies"]
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from multiprocessing import * # noqa: F403
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__all__ += multiprocessing.__all__ # noqa: PLE0605 type: ignore[attr-defined]
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# This call adds a Linux specific prctl(2) wrapper function to this module.
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# See https://github.com/pytorch/pytorch/pull/14391 for more information.
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torch._C._multiprocessing_init()
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"""Add helper function to spawn N processes and wait for completion of any of
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them. This depends `mp.get_context` which was added in Python 3.4."""
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from .spawn import (
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ProcessContext,
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ProcessExitedException,
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ProcessRaisedException,
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spawn,
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SpawnContext,
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start_processes,
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)
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if sys.platform == "darwin" or sys.platform == "win32":
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_sharing_strategy = "file_system"
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_all_sharing_strategies = {"file_system"}
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else:
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_sharing_strategy = "file_descriptor"
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_all_sharing_strategies = {"file_descriptor", "file_system"}
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def set_sharing_strategy(new_strategy):
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"""Set the strategy for sharing CPU tensors.
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Args:
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new_strategy (str): Name of the selected strategy. Should be one of
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the values returned by :func:`get_all_sharing_strategies()`.
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"""
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global _sharing_strategy
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assert new_strategy in _all_sharing_strategies
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_sharing_strategy = new_strategy
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def get_sharing_strategy():
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"""Return the current strategy for sharing CPU tensors."""
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return _sharing_strategy
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def get_all_sharing_strategies():
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"""Return a set of sharing strategies supported on a current system."""
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return _all_sharing_strategies
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init_reductions()
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