如何在C#中获得CPU使用率？

Question

我想获得C#中应用程序的总CPU使用率.我已经找到了许多方法来深入研究进程的属性,但我只想要进程的CPU使用率,以及你在TaskManager中获得的总CPU.

我怎么做？

Answer 1

您可以使用System.Diagnostics中的PerformanceCounter类.

像这样初始化:

PerformanceCounter cpuCounter;
PerformanceCounter ramCounter;

cpuCounter = new PerformanceCounter("Processor", "% Processor Time", "_Total");
ramCounter = new PerformanceCounter("Memory", "Available MBytes");

消费如下:

public string getCurrentCpuUsage(){
            return cpuCounter.NextValue()+"%";
}

public string getAvailableRAM(){
            return ramCounter.NextValue()+"MB";
} 

Answer 2

多一点是requsted,但我使用额外的计时码追踪和警报,如果CPU使用率是90%或更高,1分钟或更长的持续期.

public class Form1
{

    int totalHits = 0;

    public object getCPUCounter()
    {

        PerformanceCounter cpuCounter = new PerformanceCounter();
        cpuCounter.CategoryName = "Processor";
        cpuCounter.CounterName = "% Processor Time";
        cpuCounter.InstanceName = "_Total";

                     // will always start at 0
        dynamic firstValue = cpuCounter.NextValue();
        System.Threading.Thread.Sleep(1000);
                    // now matches task manager reading
        dynamic secondValue = cpuCounter.NextValue();

        return secondValue;

    }


    private void Timer1_Tick(Object sender, EventArgs e)
    {
        int cpuPercent = (int)getCPUCounter();
        if (cpuPercent >= 90)
        {
            totalHits = totalHits + 1;
            if (totalHits == 60)
            {
                Interaction.MsgBox("ALERT 90% usage for 1 minute");
                totalHits = 0;
            }                        
        }
        else
        {
            totalHits = 0;
        }
        Label1.Text = cpuPercent + " % CPU";
        //Label2.Text = getRAMCounter() + " RAM Free";
        Label3.Text = totalHits + " seconds over 20% usage";
    }
}

Answer 3

花了一些时间阅读几个看起来相当复杂的不同线程,我想出了这个.我需要它用于我想监视SQL服务器的8核机器.对于下面的代码,我传入"sqlservr"作为appName.

private static void RunTest(string appName)
{
    bool done = false;
    PerformanceCounter total_cpu = new PerformanceCounter("Process", "% Processor Time", "_Total");
    PerformanceCounter process_cpu = new PerformanceCounter("Process", "% Processor Time", appName);
    while (!done)
    {
        float t = total_cpu.NextValue();
        float p = process_cpu.NextValue();
        Console.WriteLine(String.Format("_Total = {0}  App = {1} {2}%\n", t, p, p / t * 100));
        System.Threading.Thread.Sleep(1000);
    }
}

它似乎正确地测量了我的8核服务器上SQL使用的CPU百分比.

Answer 4

没关系,我明白了!谢谢你的帮助!

这是执行此操作的代码:

private void button1_Click(object sender, EventArgs e)
{
    selectedServer = "JS000943";
    listBox1.Items.Add(GetProcessorIdleTime(selectedServer).ToString());
}

private static int GetProcessorIdleTime(string selectedServer)
{
    try
    {
        var searcher = new
           ManagementObjectSearcher
             (@"\\"+ selectedServer +@"\root\CIMV2",
              "SELECT * FROM Win32_PerfFormattedData_PerfOS_Processor WHERE Name=\"_Total\"");

        ManagementObjectCollection collection = searcher.Get();
        ManagementObject queryObj = collection.Cast<ManagementObject>().First();

        return Convert.ToInt32(queryObj["PercentIdleTime"]);
    }
    catch (ManagementException e)
    {
        MessageBox.Show("An error occurred while querying for WMI data: " + e.Message);
    }
    return -1;
}

Answer 5

您可以使用WMI获取CPU百分比信息.如果您具有正确的权限,甚至可以登录到远程计算机.请访问http://www.csharphelp.com/archives2/archive334.html,了解您可以完成的任务.

另外有用的可能是Win32_Process命名空间的MSDN参考.

另请参阅CodeProject示例如何:(几乎)通过C#在WMI中的所有内容.

Answer 6

CMS是正确的,但如果您在visual studio中使用服务器资源管理器并使用性能计数器选项卡,那么您可以弄清楚如何获得大量有用的指标.