CPU使用率与任务管理器,PerformanceCounter或ManagementObjectSearcher不匹配

Question

我只是想获得与任务管理器匹配的准确CPU使用率.到目前为止,我已经尝试了四种不起作用的推荐方法.

首先,我尝试了类似的解决方案或建议,我可以找到.这里的代码示例使用四种方法,所有方法都不准确.其次,我知道任务管理器会波动并取决于它何时被采样.这仍然没有考虑到差异.最后,我知道有不同的方法,任务管理器只使用一种方法.由于这适用于一般用户,因此需要靠近任务管理器.

public partial class MainWindow : Window
{
    //*** Method 1 & 2
    PerformanceCounter cpuCounterPi = new PerformanceCounter("Processor Information", "% Processor Time", "_Total");
    PerformanceCounter cpuCounterP = new PerformanceCounter("Processor", "% Processor Time", "_Total");

    //*** method 3
    ManagementObjectSearcher query1 = new ManagementObjectSearcher("select loadpercentage from win32_processor");

    //*** Mixed method usage below
    CounterSample csPi1, csPi2, csP1, csP2;
    double cpuPercentagePi, cpuPercentageP, cpuPercentageLoad;
    int count = -1;
    Boolean alternate = false;

    System.Windows.Threading.DispatcherTimer dispatcherTimer = new System.Windows.Threading.DispatcherTimer();

    public MainWindow()
    {
        InitializeComponent();

        dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick);
        dispatcherTimer.Interval = new TimeSpan(0, 0, 5);
        dispatcherTimer.Start();
    }

    private void dispatcherTimer_Tick(object sender, EventArgs e)
    {
        count++;
        //***Method 1 & 2
        if (alternate)
        {
            csPi1 = cpuCounterPi.NextSample();
            cpuPercentagePi = CounterSample.Calculate(csPi2, csPi1);
            csP1 = cpuCounterP.NextSample();
            cpuPercentageP = CounterSample.Calculate(csP2, csP1);

        }
        else
        {
            csPi2 = cpuCounterPi.NextSample();
            cpuPercentagePi = CounterSample.Calculate(csPi1, csPi2);
            csP2 = cpuCounterP.NextSample();
            cpuPercentageP = CounterSample.Calculate(csP1, csP2);
        }
        alternate = !alternate;

        if (count==5) { textBox.Clear(); count = 0; }
        textBox.Text = textBox.Text + "\nProcessor Information (Method 1)         " + cpuPercentagePi.ToString();
        textBox.Text = textBox.Text + "\nProcessor  (Method 2)                          " + cpuPercentageP.ToString();
        textBox.Text = textBox.Text + "\nProcessor ½  (Method 2 divided by 2)   " + (cpuPercentageP/2).ToString();
        //*****  Method 3 ****
        ManagementObjectCollection cpuColl = query1.Get();
        foreach (ManagementObject mo in cpuColl)
        {
            cpuPercentageLoad = Convert.ToDouble(mo["loadpercentage"]);
        }
        textBox.Text = textBox.Text +  "\nProcessor Load  (Method 3)                " + cpuPercentageLoad.ToString() + "\n";

    }

以下是与任务管理器相比的两个示例.

从图中可以看出,我有一个双核CPU,有四个逻辑处理器.CPU是Intel Skylake i7-6650U,运行Windows 10.

谢谢

供参考 - 这些链接类似: PerformanceCounter报告的CPU使用率高于观察到的 如何获得C#中的CPU使用率？ 计算Windows进程的CPU使用率？

Answer 1

你有 2 个核心但有 4 个线程，所以你需要除以 4，而不是 2。我怀疑你的 WMI 方法只会检查 1 个核心。检查实际上是否有多个win32_processor可用对象。