python - 多处理酸洗错误:_pickle.PicklingError: Can't pickle:它与 __main__.myProcess 不是同一个对象
问题描述
我正在阅读和应用 python 书中的代码,我不能在简单的示例中使用多处理,您可以在下面看到:
import multiprocessing
def myProcess():
print("Currently Executing Child Process")
print("This process has it's own instance of the GIL")
print("Executing Main Process")
print("Creating Child Process")
myProcess = multiprocessing.Process(target=myProcess)
myProcess.start()
myProcess.join()
print("Child Process has terminated, terminating main process")
我的平台是 Windows 10 64 位并使用 if __name_ == "__main_" : 在这种情况下不起作用。这里有什么问题?此代码应在 python 3.5 及更高版本中工作。我使用的 Python 版本是 3.7。完整的错误信息如下:
C:\Users\Xian\AppData\Local\Programs\Python\Python37-32\python.exe "C:/OneDrive/Utilizing sub-process.py"
Traceback (most recent call last):
File "C:/OneDrive/Utilizing sub-process.py", line 25, in <module>
myProcess.start()
File "C:\Users\Xian\AppData\Local\Programs\Python\Python37-32\lib\multiprocessing\process.py", line 112, in start
self._popen = self._Popen(self)
File "C:\Users\Xian\AppData\Local\Programs\Python\Python37-32\lib\multiprocessing\context.py", line 223, in _Popen
return _default_context.get_context().Process._Popen(process_obj)
File "C:\Users\Xian\AppData\Local\Programs\Python\Python37-32\lib\multiprocessing\context.py", line 322, in _Popen
return Popen(process_obj)
File "C:\Users\Xian\AppData\Local\Programs\Python\Python37-32\lib\multiprocessing\popen_spawn_win32.py", line 65, in __init__
reduction.dump(process_obj, to_child)
File "C:\Users\Xian\AppData\Local\Programs\Python\Python37-32\lib\multiprocessing\reduction.py", line 60, in dump
ForkingPickler(file, protocol).dump(obj)
_pickle.PicklingError: Can't pickle <function myProcess at 0x02B2D420>: it's not the same object as __main__.myProcess
解决方案
尝试这个
def test()
import multiprocessing
multiprocessing.set_start_method("fork")
p = multiprocessing.Process(target=xxx)
p.start()
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