在 Python 中更改进程优先级，跨平台 [英] Change process priority in Python, cross-platform

问题描述

我有一个执行耗时计算的 Python 程序.由于它使用高 CPU，并且我希望我的系统保持响应，我希望程序将其优先级更改为低于正常.

I've got a Python program that does time-consuming computations. Since it uses high CPU, and I want my system to remain responsive, I'd like the program to change its priority to below-normal.

我发现了这个:在 Windows 中设置进程优先级 - ActiveState

但我正在寻找跨平台的解决方案.

But I'm looking for a cross-platform solution.

推荐答案

这是我用来将我的进程设置为低于正常优先级的解决方案:

Here's the solution I'm using to set my process to below-normal priority:

lowpriority.py

def lowpriority():
    """ Set the priority of the process to below-normal."""

    import sys
    try:
        sys.getwindowsversion()
    except AttributeError:
        isWindows = False
    else:
        isWindows = True

    if isWindows:
        # Based on:
        #   "Recipe 496767: Set Process Priority In Windows" on ActiveState
        #   http://code.activestate.com/recipes/496767/
        import win32api,win32process,win32con

        pid = win32api.GetCurrentProcessId()
        handle = win32api.OpenProcess(win32con.PROCESS_ALL_ACCESS, True, pid)
        win32process.SetPriorityClass(handle, win32process.BELOW_NORMAL_PRIORITY_CLASS)
    else:
        import os

        os.nice(1)

在 Windows 和 Linux 上的 Python 2.6 上测试.

Tested on Python 2.6 on Windows and Linux.

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