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favyen2
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Jan 20, 2026
| def init_mp() -> None: | ||
| """Set start method to preload and configure forkserver preload.""" | ||
| multiprocessing.set_start_method("forkserver", force=True) | ||
| multiprocessing.set_forkserver_preload( |
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Can we keep the preload, in case ? It makes it much faster if forkserver is used.
favyen2
reviewed
Jan 20, 2026
| def init_mp(context: str | None = None, sharing_strategy: str | None = None) -> None: | ||
| """Set start method for multiprocessing. | ||
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| Uses RSLEARN_MULTIPROCESSING_CONTEXT if provided, else defaults to forkserver. |
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I think this could be clarified a bit. Also context does not seem like the correct name, should it be mp_start_method instead? Something like:
Args:
mp_start_method: the multiprocessing start method to set. If not set, use the RSLEARN_MULTIPROCESSING_CONTEXT if provided. Otherwise, it defaults to forkserver.
sharing_strategy: the torch sharing strategy to set. If not set, use the MP_SHARING_STRATEGY_ENV_VAR if provided. Otherwise, the sharing strategy is not changed.
favyen2
reviewed
Jan 20, 2026
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| if __name__ == "__main__": | ||
| multiprocessing.set_start_method("forkserver") |
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init_mp should be called here since we only call it in the entrypoints, not in the main functions. Moving init_mp into the main function in rslearn_main.py could be okay too.
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