是否可以取消子流程? [英] Is it possible to renice a subprocess?

问题描述

我了解 os.nice() ，它非常完美对于父进程，但我需要对子进程进行重复操作.我找到了解决方法，但似乎不太方便，也不过分:

I know about os.nice() it works perfect for parent process, but I need to do renice of my child subprocesses. I found way to do this, but it seems to be not very handy and too excessive:

os.system("renice -n %d %d" % ( new_nice, suprocess.pid ) )

在补全后不会返回结果良好的水平.

And it isn't return resulting nice level after renicing.

是否有更干净的方法来重用python中的子进程?

Is there more clean way to renice subprocesses in python?

推荐答案

使用preexec_fn参数"rel =" noreferrer> subprocess.Popen :

Use the preexec_fn parameter of subprocess.Popen:

如果将preexec_fn设置为可调用对象，则将在执行子级之前在子进程中调用此对象. (仅限Unix)

If preexec_fn is set to a callable object, this object will be called in the child process just before the child is executed. (Unix only)

示例:

>>> Popen(["nice"]).communicate()
0
(None, None)
>>> Popen(["nice"], preexec_fn=lambda : os.nice(10)).communicate()
10
(None, None)
>>> Popen(["nice"], preexec_fn=lambda : os.nice(20)).communicate()
19
(None, None)

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