从计算过程Process.TotalProcessorTime CPU使用率 [英] Calculating process cpu usage from Process.TotalProcessorTime

问题描述

我一直在试图从使用的PerformanceCounter 类移开用于监视一个进程的CPU占用率，因为它似乎它需要CPU的一个体面的数额时，进程计数得到体面高（监控了许多工序时）。

我的第一种方法是采取使用 Win32_PerfFormattedData_PerfOS_Processor ​​类和PercentProcessorTime的WMI路线属性，但似乎有尝试计算在多个内核的CPU使用率（它返回被100％使得不可能根据CPU核心数量除以它，导致不准确的结果的最大值）时的一个问题。

所以最后我决定使用过程的类的 TotalProcessorTime 财产。可悲的是，我不能确定如何计算基于价值的过程中所使用的CPU使用总量的百分比。我知道我应该从以前的PercentProcessorTime值中减去当前PercentProcessorTime值来获得处理器的过程中花了多少时间在一定时限内，但我不确定如何从那里继续。

先谢谢了。

解决方案

 类GetCPUUsage 
 {
静态时间跨度启动; 
公共静态双CPUUsageTotal 
 {
获得; 
私人集; 
} 
 
公共静态双CPUUsageLastMinute 
 {
获得; 
私人集; 
} 
 
静态时间跨度oldCPUTime =新的时间跨度（0）; 
静态的DateTime lastMonitorTime = DateTime.UtcNow; 
公共静态的DateTime开始时间= DateTime.UtcNow; 
 //调用一次一切准备就绪
静态无效OnStartup（）
 {
开始= Process.GetCurrentProcess（）TotalProcessorTime。 
} 
 
 //调用这个每30秒
静态无效CallCPU（）
 {
时间跨度newCPUTime = Process.GetCurrentProcess（）TotalProcessorTime  - 启动; 
 CPUUsageLastMinute =（newCPUTime  -  oldCPUTime）.TotalSeconds /（Environment.ProcessorCount * DateTime.UtcNow.Subtract（lastMonitorTime）.TotalSeconds）; 
 lastMonitorTime = DateTime.UtcNow; 
 CPUUsageTotal = newCPUTime.TotalSeconds /（Environment.ProcessorCount * DateTime.UtcNow.Subtract（开始时间）.TotalSeconds）; 
 oldCPUTime = newCPUTime; 
} 
} 
 
类GetCPUInfo 
 {
公共静态字符串GetInfoMinute（）
 {
返回的String.Format（ {0：0.0}，GetCPUUsage.CPUUsageLastMinute * 100）; 
} 
 
公共静态字符串GetInfoTotal（）
 {
返回的String.Format（{0：0.0}，GetCPUUsage.CPUUsageTotal * 100）; 
} 
} 
  

I've been trying to move away from using the PerformanceCounter class for monitoring a process's CPU usage since it seems it requires a decent amount of CPU when the process count gets decently high (when monitoring a lot of processes).

My first approach was to take the WMI route using Win32_PerfFormattedData_PerfOS_Processor class and the PercentProcessorTime property, but there seems to be an issue when trying to calculate the CPU usage over multiple cores (the max value it's returning is 100% making it impossible to divide it based on the CPU core count, resulting in inaccurate results).

So finally I decided to use the Process's class TotalProcessorTime property. Sadly I am unsure how to calculate the percentage of the total CPU usage used by the Process based the value. I know that I should subtract the current PercentProcessorTime value from a previous PercentProcessorTime value to get how much time the processor spent on the process within a certain time limit but I am unsure how to continue from there.

Thanks in advance.

解决方案

class GetCPUUsage
{
    static TimeSpan start;
    public static double CPUUsageTotal
    {
        get;
        private set;
    }

    public static double CPUUsageLastMinute
    {
        get;
        private set;
    }

    static TimeSpan oldCPUTime = new TimeSpan(0);
    static DateTime lastMonitorTime = DateTime.UtcNow;
    public static DateTime StartTime = DateTime.UtcNow;
    // Call it once everything is ready
    static void OnStartup()
    {
        start = Process.GetCurrentProcess().TotalProcessorTime;
    }

    // Call this every 30 seconds
    static void CallCPU()
    {
        TimeSpan newCPUTime = Process.GetCurrentProcess().TotalProcessorTime - start;
        CPUUsageLastMinute = (newCPUTime - oldCPUTime).TotalSeconds / (Environment.ProcessorCount * DateTime.UtcNow.Subtract(lastMonitorTime).TotalSeconds);
        lastMonitorTime = DateTime.UtcNow;
        CPUUsageTotal = newCPUTime.TotalSeconds / (Environment.ProcessorCount * DateTime.UtcNow.Subtract(StartTime).TotalSeconds);
        oldCPUTime = newCPUTime;
    }
}

class GetCPUInfo
{
    public static string GetInfoMinute()
    {
        return String.Format("{0:0.0}", GetCPUUsage.CPUUsageLastMinute * 100);
    }

    public static string GetInfoTotal()
    {
        return String.Format("{0:0.0}", GetCPUUsage.CPUUsageTotal * 100);
    }
}

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