59 lines
1.9 KiB
Python
59 lines
1.9 KiB
Python
# Copyright (c) OpenMMLab. All rights reserved.
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import multiprocessing as mp
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import os
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import platform
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import cv2
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from mmengine.utils import set_multi_processing
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def test_setup_multi_processes():
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# temp save system setting
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sys_start_mehod = mp.get_start_method(allow_none=True)
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sys_cv_threads = cv2.getNumThreads()
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# pop and temp save system env vars
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sys_omp_threads = os.environ.pop('OMP_NUM_THREADS', default=None)
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sys_mkl_threads = os.environ.pop('MKL_NUM_THREADS', default=None)
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# test distributed
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set_multi_processing(distributed=True)
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assert os.getenv('OMP_NUM_THREADS') == '1'
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assert os.getenv('MKL_NUM_THREADS') == '1'
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# when set to 0, the num threads will be 1
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assert cv2.getNumThreads() == 1
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if platform.system() != 'Windows':
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assert mp.get_start_method() == 'fork'
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# test num workers <= 1
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os.environ.pop('OMP_NUM_THREADS')
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os.environ.pop('MKL_NUM_THREADS')
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set_multi_processing(distributed=False)
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assert 'OMP_NUM_THREADS' not in os.environ
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assert 'MKL_NUM_THREADS' not in os.environ
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# test manually set env var
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os.environ['OMP_NUM_THREADS'] = '4'
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set_multi_processing(distributed=False)
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assert os.getenv('OMP_NUM_THREADS') == '4'
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# test manually set opencv threads and mp start method
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config = dict(
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mp_start_method='spawn', opencv_num_threads=4, distributed=True)
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set_multi_processing(**config)
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assert cv2.getNumThreads() == 4
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assert mp.get_start_method() == 'spawn'
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# revert setting to avoid affecting other programs
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if sys_start_mehod:
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mp.set_start_method(sys_start_mehod, force=True)
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cv2.setNumThreads(sys_cv_threads)
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if sys_omp_threads:
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os.environ['OMP_NUM_THREADS'] = sys_omp_threads
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else:
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os.environ.pop('OMP_NUM_THREADS')
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if sys_mkl_threads:
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os.environ['MKL_NUM_THREADS'] = sys_mkl_threads
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else:
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os.environ.pop('MKL_NUM_THREADS')
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