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| # Copyright (c) Meta Platforms, Inc. and affiliates. | |
| # All rights reserved. | |
| # | |
| # This source code is licensed under the license found in the | |
| # LICENSE file in the root directory of this source tree. | |
| import os | |
| import platform | |
| import warnings | |
| import torch.multiprocessing as mp | |
| def set_multi_processing(mp_start_method: str = 'fork', | |
| opencv_num_threads: int = 0, | |
| distributed: bool = False) -> None: | |
| """Set multi-processing related environment. | |
| Args: | |
| mp_start_method (str): Set the method which should be used to start | |
| child processes. Defaults to 'fork'. | |
| opencv_num_threads (int): Number of threads for opencv. | |
| Defaults to 0. | |
| distributed (bool): True if distributed environment. | |
| Defaults to False. | |
| """ | |
| # set multi-process start method as `fork` to speed up the training | |
| if platform.system() != 'Windows': | |
| current_method = mp.get_start_method(allow_none=True) | |
| if (current_method is not None and current_method != mp_start_method): | |
| warnings.warn( | |
| f'Multi-processing start method `{mp_start_method}` is ' | |
| f'different from the previous setting `{current_method}`.' | |
| f'It will be force set to `{mp_start_method}`. You can ' | |
| 'change this behavior by changing `mp_start_method` in ' | |
| 'your config.') | |
| mp.set_start_method(mp_start_method, force=True) | |
| try: | |
| import cv2 | |
| # disable opencv multithreading to avoid system being overloaded | |
| cv2.setNumThreads(opencv_num_threads) | |
| except ImportError: | |
| pass | |
| # setup OMP threads | |
| # This code is referred from https://github.com/pytorch/pytorch/blob/master/torch/distributed/run.py # noqa | |
| if 'OMP_NUM_THREADS' not in os.environ and distributed: | |
| omp_num_threads = 1 | |
| warnings.warn( | |
| 'Setting OMP_NUM_THREADS environment variable for each process' | |
| f' to be {omp_num_threads} in default, to avoid your system ' | |
| 'being overloaded, please further tune the variable for ' | |
| 'optimal performance in your application as needed.') | |
| os.environ['OMP_NUM_THREADS'] = str(omp_num_threads) | |
| # setup MKL threads | |
| if 'MKL_NUM_THREADS' not in os.environ and distributed: | |
| mkl_num_threads = 1 | |
| warnings.warn( | |
| 'Setting MKL_NUM_THREADS environment variable for each process' | |
| f' to be {mkl_num_threads} in default, to avoid your system ' | |
| 'being overloaded, please further tune the variable for ' | |
| 'optimal performance in your application as needed.') | |
| os.environ['MKL_NUM_THREADS'] = str(mkl_num_threads) | |