宁好 我使用python2.7执行您写的进程代码报错

Question

环境：python2.7

执行代码块:

from multiprocessing import Process
#
def foo(i):
   print"This is Process "

for i in range(5):
   p = Process(target=foo, args=(i,))
   p.start()

报错信息：

Traceback (most recent call last):

  File "<string>", line 1, in <module>

  File "C:\Python27\lib\multiprocessing\forking.py", line 380, in main

    prepare(preparation_data)

  File "C:\Python27\lib\multiprocessing\forking.py", line 509, in prepare

    '__parents_main__', file, path_name, etc

  File "G:\��ɵĹ���\python basic\Process thread co process.py", line 26, in <module>

    p.start()

  File "C:\Python27\lib\multiprocessing\process.py", line 130, in start

    self._popen = Popen(self)

  File "C:\Python27\lib\multiprocessing\forking.py", line 258, in __init__

    cmd = get_command_line() + [rhandle]

  File "C:\Python27\lib\multiprocessing\forking.py", line 358, in get_command_line

    is not going to be frozen to produce a Windows executable.''')

RuntimeError: 

            Attempt to start a new process before the current process

            has finished its bootstrapping phase.

            This probably means that you are on Windows and you have

            forgotten to use the proper idiom in the main module:

                if __name__ == '__main__':

                    freeze_support()

                    ...

            The "freeze_support()" line can be omitted if the program

            is not going to be frozen to produce a Windows executable.

Traceback (most recent call last):

  File "<string>", line 1, in <module>

  File "C:\Python27\lib\multiprocessing\forking.py", line 380, in main

    prepare(preparation_data)

  File "C:\Python27\lib\multiprocessing\forking.py", line 509, in prepare

    '__parents_main__', file, path_name, etc

  File "G:\��ɵĹ���\python basic\Process thread co process.py", line 26, in <module>

    p.start()

  File "C:\Python27\lib\multiprocessing\process.py", line 130, in start

    self._popen = Popen(self)

  File "C:\Python27\lib\multiprocessing\forking.py", line 258, in __init__

    cmd = get_command_line() + [rhandle]

  File "C:\Python27\lib\multiprocessing\forking.py", line 358, in get_command_line

    is not going to be frozen to produce a Windows executable.''')

RuntimeError: 

            Attempt to start a new process before the current process

            has finished its bootstrapping phase.

            This probably means that you are on Windows and you have

            forgotten to use the proper idiom in the main module:

                if __name__ == '__main__':

                    freeze_support()

                    ...

            The "freeze_support()" line can be omitted if the program

            is not going to be frozen to produce a Windows executable.

Traceback (most recent call last):

  File "<string>", line 1, in <module>

  File "C:\Python27\lib\multiprocessing\forking.py", line 380, in main

    prepare(preparation_data)

  File "C:\Python27\lib\multiprocessing\forking.py", line 509, in prepare

    '__parents_main__', file, path_name, etc

  File "G:\��ɵĹ���\python basic\Process thread co process.py", line 26, in <module>

    p.start()

  File "C:\Python27\lib\multiprocessing\process.py", line 130, in start

    self._popen = Popen(self)

  File "C:\Python27\lib\multiprocessing\forking.py", line 258, in __init__

    cmd = get_command_line() + [rhandle]

  File "C:\Python27\lib\multiprocessing\forking.py", line 358, in get_command_line

    is not going to be frozen to produce a Windows executable.''')

RuntimeError: 

            Attempt to start a new process before the current process

            has finished its bootstrapping phase.

            This probably means that you are on Windows and you have

            forgotten to use the proper idiom in the main module:

                if __name__ == '__main__':

                    freeze_support()

                    ...

            The "freeze_support()" line can be omitted if the program

            is not going to be frozen to produce a Windows executable.

Traceback (most recent call last):

  File "<string>", line 1, in <module>

  File "C:\Python27\lib\multiprocessing\forking.py", line 380, in main

    prepare(preparation_data)

  File "C:\Python27\lib\multiprocessing\forking.py", line 509, in prepare

    '__parents_main__', file, path_name, etc

  File "G:\��ɵĹ���\python basic\Process thread co process.py", line 26, in <module>

    p.start()

  File "C:\Python27\lib\multiprocessing\process.py", line 130, in start

    self._popen = Popen(self)

  File "C:\Python27\lib\multiprocessing\forking.py", line 258, in __init__

    cmd = get_command_line() + [rhandle]

  File "C:\Python27\lib\multiprocessing\forking.py", line 358, in get_command_line

    is not going to be frozen to produce a Windows executable.''')

RuntimeError: 

            Attempt to start a new process before the current process

            has finished its bootstrapping phase.

            This probably means that you are on Windows and you have

            forgotten to use the proper idiom in the main module:

                if __name__ == '__main__':

                    freeze_support()

                    ...

            The "freeze_support()" line can be omitted if the program

            is not going to be frozen to produce a Windows executable.

Traceback (most recent call last):

  File "<string>", line 1, in <module>

  File "C:\Python27\lib\multiprocessing\forking.py", line 380, in main

    prepare(preparation_data)

  File "C:\Python27\lib\multiprocessing\forking.py", line 509, in prepare

    '__parents_main__', file, path_name, etc

  File "G:\��ɵĹ���\python basic\Process thread co process.py", line 26, in <module>

    p.start()

  File "C:\Python27\lib\multiprocessing\process.py", line 130, in start

    self._popen = Popen(self)

  File "C:\Python27\lib\multiprocessing\forking.py", line 258, in __init__

    cmd = get_command_line() + [rhandle]

  File "C:\Python27\lib\multiprocessing\forking.py", line 358, in get_command_line

    is not going to be frozen to produce a Windows executable.''')

RuntimeError: 

            Attempt to start a new process before the current process

            has finished its bootstrapping phase.

            This probably means that you are on Windows and you have

            forgotten to use the proper idiom in the main module:

                if __name__ == '__main__':

                    freeze_support()

                    ...

            The "freeze_support()" line can be omitted if the program

            is not going to be frozen to produce a Windows executable.

Answer 1

毫末 2018-02-26 13:21:43

windows上需要面函数，

可以参考：

http://blog.csdn.net/yanhuatangtang/article/details/75270655

from multiprocessing import Process  

#window不可以用fork()，但是可以用multiprocessing，可以跨平台使用  

import time  

  

def test():  

    print("hello")  

  

if __name__=='__main__':  

    #freeze__support()  

    p=Process(target=test)  

    p.start()  

#所有的进程结束后，程序才结束  

• 慕虎5501786 #1

  谢谢老师的解答，这个也解决了我的问题

Answer 2

提问者 bob_jie 2018-02-26 20:43:42

感谢老师 我明天测试下

Answer 3

毫末 2018-02-26 13:18:23

加以下一段试试

import parallelTestModule

if __name__ == '__main__':    
   extractor = parallelTestModule.ParallelExtractor()
   extractor.runInParallel(numProcesses=2, numThreads=4)

参考，https://stackoverflow.com/questions/18204782/runtimeerror-on-windows-trying-python-multiprocessing