Set multiprocessing start method explicitly through context #447
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Well, this obviously fails on Windows, which can't fork... |
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I implemented accessors for the reusable global multiprocessing state used by the cooler CLI. They are initialized on first access. It creates a context with "fork" on Unix/MacOS and "spawn" in Windows, but the method can be overridden with an environment variable This has the benefit that multiprocessing objects won't be constructed if only the cooler API is used, as in #329 where multiprocessing synchronization primitives are not available on AWS lambda. cc @pkerpedjiev |
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The default start method for multiprocessing will change from "fork" to "spawn" on all platforms: https://docs.python.org/3/library/multiprocessing.html#contexts-and-start-methods
This PR uses contexts to keep the current fork behavior until we decide to migrate to spawn or refactor further. cc @mimakaev