1。系统时间

Question

我试图通过pid获取进程cpu的使用情况。我做了一些关于它的研究，我发现我可以使用GetSystemTimes（）函数来计算它。我在此链接中找到了计算：http://www.codeproject.com/Articles/10258/How-to-get-CPU-usage-of-processes-and-threads

我需要Python中的这段代码但是我不知道如何做到这一点。所以我找到了这段代码：https://sites.google.com/site/cadspython/home/modules/calcprocesscpuusage-py

我试图运行它，一切都运行正常，但是当我运行一个小程序（从cpu利用率中占28％）时，代码显示我100％和98％。这不好。

所以，我要求一个代码，通过在Python中使用GetSystemTimes（）函数计算进程cpu使用率（使用pywin32）。

提前致谢。

Answer 1

经过一番研究后，我找到了解决方案。

因此，为了获得进程cpu使用率的百分比，我们需要一些参数：

1。系统时间

要计算这个，我们需要用户模式时间，内核模式时间和空闲模式时间：

    from ctypes import *
    import time

    class FILETIME(Structure):
       _fields_ = [
          ("dwLowDateTime", DWORD),
          ("dwHighDateTime", DWORD)]

    def GetSystemTimes():
        """
        Uses the function GetSystemTimes() (win32) in order to get the user    mode time, kernel mode time and idle mode time
        :return: user time, kernel time and idle time (Dictinary)
        """

        __GetSystemTimes = windll.kernel32.GetSystemTimes
        idleTime, kernelTime, userTime = FILETIME(), FILETIME(), FILETIME()

        success = __GetSystemTimes(

        byref(idleTime),
        byref(kernelTime),
        byref(userTime))

        assert success, ctypes.WinError(ctypes.GetLastError())[1]

        return {
            "idleTime": idleTime.dwLowDateTime,
            "kernelTime": kernelTime.dwLowDateTime,
            "userTime": userTime.dwLowDateTime
           }


    def get_sys():  

        FirstSystemTimes = GetSystemTimes()
        time.sleep(SLEEP_TIME_1_5)
        SecSystemTimes = GetSystemTimes()

        """
         The total amount of time the system has operated since the last measurement is calculated by getting 
         kernel + user
        """

       usr = SecSystemTimes['userTime'] - FirstSystemTimes['userTime']
       ker = SecSystemTimes['kernelTime'] - FirstSystemTimes['kernelTime']
       idl = SecSystemTimes['idleTime'] - FirstSystemTimes['idleTime']

       sys = usr + ker
       return sys

2。处理用户模式时间和进程内核时间

要首先获取这些参数，我们需要创建一个新的流程句柄，然后我们将能够获得流程用户模式时间并处理内核时间：

def cpu_process_util(pid):
    """
    Returns the process usage of CPU

    Source: http://www.philosophicalgeek.com/2009/01/03/determine-cpu-usage-of-current-process-c-and-c/
    :return: Process CPU usage (int)
    """

    # Creates a process handle
    proc = win32api.OpenProcess(ALL_PROCESS_ACCESS, False, pid)

    FirstProcessTimes = win32process.GetProcessTimes(proc)
    time.sleep(SLEEP_TIME_1_5)
    SecProcessTimes = win32process.GetProcessTimes(proc)

    """
     Process CPU usage is calculated by getting the total amount of time
     the system has operated since the last measurement
     made up of kernel + user) and the total
     amount of time the process has run (kernel + user).
    """

    proc_time_user_prev = FirstProcessTimes['UserTime']
    proc_time_kernel_prev = FirstProcessTimes['KernelTime']

    proc_time_user = SecProcessTimes['UserTime']
    proc_time_kernel = SecProcessTimes['KernelTime']

    proc_usr = proc_time_user - proc_time_user_prev
    proc_ker = proc_time_kernel - proc_time_kernel_prev

    proc_total_time = proc_usr + proc_ker

    return (100 * proc_total_time) / get_sys()

通过Python计算进程cpu使用情况

1 个答案:

1。系统时间

2。处理用户模式时间和进程内核时间