获得从WMI每个进程的CPU使用率 [英] Get the Cpu usage of each process from wmi

问题描述

我发现许多来源获得每个进程的CPU占用率。一般来说有很多方法可以获取进程的CPU占用率。

I found many sources to get the cpu usage of each process. in general there are many ways to get the cpu usage of process .

1. 从win32_perfformatteddata_perfproc_process percentprocessortime


2. 在System.Diagnostics程序


3. 通过手工计算


4. Process类PerformanceCounter类（由process.getcurrentprocess（）totalprocessortime;）
   作为所说在这里。

1. percentprocessortime from win32_perfformatteddata_perfproc_process
2. performancecounter class in system.diagnostics
3. by manual calculation
4. Process class (by process.getcurrentprocess().totalprocessortime;) as said in here.

FirstWay：

有关远程过程监控（我的方案是远程监控），该percentprocessortime总是显示为0〜100+。这种100+是因为系统中的多个处理器。它可以通过使用percentprocessortime / processorcount来计算。

For the remote process monitoring(my scenario is remote monitoring), the percentprocessortime always shows value 0 to 100+. this 100+ happens because of multiple processors in a system. it can be calculated by using percentprocessortime/ processorcount.

问在firstway：

我可以读取WMI浏览器中的percentprocessortime，它显示了所有的值是0或100只不大于该值其他。是这个值是正确的？或者是监测值有用

i can read the percentprocessortime in wmi explorer, it shows all the values are 0 or 100 only not other than this value. is this value is correct? or is it useful for monitoring the value?

第二种方式：

有关PerformanceCounter类的监测，它只能为本地完成。所以我不能用这个。 ？是否有可能使用它进行远程

for PerformanceCounter class monitoring, it can be done for local only. so i cannot use this. is it possible to use this for remote?

第三条道路：

（最大的困惑发生在这里无论在哪个公式来使用。）这种计算通过从一个WMI PerformanceCounter类或Win32_Process类的。也有人说，通过使用follwing

(biggest confusion happening here in terms of which formula to use.) this calculation is made either by a PerformanceCounter class or win32_process class from wmi. some says to calculate the performance counter by using the follwing

计算性能计数器考虑单CPU以及

consider single CPU and

（processor\％处理器时间）= 10％

(processor\%processor time) = 10%

（processor\％用户时间）= 8％

(processor\%user time) = 8%

（processor\\ \\％特权时间）= 2％

(processor\% privilege time) = 2%

（process\％的处理器time\your应用程序）= 80％

(process\% processor time\your application) = 80%

您应用程序正在使用的（processor\％用户时间）80％，它是（8 * 0.8）= 6.4的CPU％。

You application is using 80% of the (processor\% user time) which is (8*.8)=6.4% of the CPU.

更多参考的这里。

通过使用下列公式

DateTime firstSample, secondSample;
firstSample = DateTime.Now;
queryObj.Get();
//get cpu usage
ulong u_oldCPU = (ulong)queryObj.Properties["UserModeTime"].Value 
                +(ulong)queryObj.Properties["KernelModeTime"].Value;
//sleep to create interval
System.Threading.Thread.Sleep(1000);
//refresh object
secondSample = DateTime.Now;
queryObj.Get();
//get new usage
ulong u_newCPU = (ulong)queryObj.Properties["UserModeTime"].Value
               + (ulong)queryObj.Properties["KernelModeTime"].Value;
decimal msPassed = Convert.ToDecimal(
                             (secondSample - firstSample).TotalMilliseconds);

//formula to get CPU ussage
if (u_newCPU > u_oldCPU)
    PercentProcessorTime = (decimal)((u_newCPU - u_oldCPU) / 
                               (msPassed * 100 * Environment.ProcessorCount));

Console.WriteLine("Process name " + queryObj.Properties["name"].value);                       
Console.WriteLine("processor time " + PercentProcessorTime);

以上代码的结果输出85.999，有时135.89888。我是如此迷茫哪种方式我可以计算过程中的CPU占用

the above code results output in 85.999 and sometimes 135.89888. i was so confused which way can i calculate the cpu usage of process.

注意：
它是一种重复。我不能来从现有的资源的结论。我被搞糊涂了。所以只有我问一个问题。

Note: Its a duplicate. I cannot come to the conclusion from the existing sources. and i was confused. so only i asked a question.

推荐答案

您可以使用WMI查询此。我认为你正在寻找的 Win32_PerfFormattedData_PerfProc_Process 的类

You can use WMI to query this. I think you are looking for Win32_PerfFormattedData_PerfProc_Process class.

using System;
using System.Management;
using System.Windows.Forms;

namespace WMISample
{
  public class MyWMIQuery
  {
    public static void Main()
    {
        try
        {
            ManagementObjectSearcher searcher = 
                new ManagementObjectSearcher("root\\CIMV2", 
                "SELECT * FROM Win32_PerfFormattedData_PerfProc_Process"); 

            foreach (ManagementObject queryObj in searcher.Get())
            {
                Console.WriteLine("-----------------------------------");
                Console.WriteLine("Name: {0}", queryObj["Name"]);
                Console.WriteLine("PercentProcessorTime: {0}", queryObj["PercentProcessorTime"]);
            }
        }
        catch (ManagementException e)
        {
            MessageBox.Show("An error occurred while querying for WMI data: " + e.Message);
        }
    }
  }
}

输出： -

Output:-

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