python隐藏exe进程,Python多重处理不断产生pythonw.exe进程，而没有做任何实际工作...

I don't understand why this simple code

# file: mp.py

from multiprocessing import Process

import sys

def func(x):

print 'works ', x + 2

sys.stdout.flush()

p = Process(target= func, args= (2, ))

p.start()

p.join()

p.terminate()

print 'done'

sys.stdout.flush()

creates "pythonw.exe" processes continuously and it doesn't print anything, even though I run it from the command line:

python mp.py

I am running the latest of Python 2.6 on Windows 7 both 32 and 64 bits

解决方案

This is a Windows specific problem. On Windows your module has to be imported into a new Python interpreter in order for it to access your target code. If you don't stop this new interpreter running the start up code it will spawn another child, which will then spawn another child, until it's pythonw.exe processes as far as the eye can see.

Other platforms use os.fork() to launch the subprocesses so don't have the problem of reimporting the module.

So your code will need to look like this:

from multiprocessing import Process

import sys

def func(x):

print 'works ', x + 2

sys.stdout.flush()

if __name__ == '__main__':

p = Process(target= func, args= (2, ))

p.start()

p.join()

p.terminate()

print 'done'

sys.stdout.flush()