c# 计算特定应用程序的 CPU 使用率

Question

我试图弄清楚如何获取特定进程的 CPU 使用率，但只能找到与 整体 CPU 使用率相关的信息。

有谁知道如何提取特定应用程序的当前 CPU 使用率百分比？

Answer 1

性能计数器 - 进程 - 处理器时间百分比。

小示例代码给你的想法：

using System;
using System.Diagnostics;
using System.Threading;

namespace StackOverflow
{
    class Program
    {
        static void Main(string[] args)
        {
            PerformanceCounter myAppCpu = 
                new PerformanceCounter(
                    "Process", "% Processor Time", "OUTLOOK", true);

            Console.WriteLine("Press the any key to stop...\n");
            while (!Console.KeyAvailable)
            {
                double pct = myAppCpu.NextValue();
                Console.WriteLine("OUTLOOK'S CPU % = " + pct);
                Thread.Sleep(250);
            }
        }
    }
}

根据进程ID查找实例的注意事项：

我不知道有什么更好的方法，希望有人知道。如果没有，这里有一种方法可以在给定进程 ID 和进程名称的情况下为您的进程找到正确的实例名称。

在"Process" 系列下还有另一个名为"ID Process" 的性能计数器（PC）。它返回实例的 PID。因此，如果您已经知道名称（即“chrome”或“myapp”），则可以测试每个实例，直到找到匹配的 PID。

每个实例的命名都很简单：“myapp”“myapp#1”“myapp#2”...等

...  new PerformanceCounter("Process", "ID Process", appName, true);

一旦 PC 的值等于 PID，您就找到了正确的 appName。然后，您可以将 appName 用于其他计数器。

Answer 2

一种在不使用 PerformanceCounter 的情况下计算单个进程的处理器使用率的方法。

using System;
using System.Diagnostics;

namespace cpuusage
{
    class Program
    {
        private static DateTime lastTime;
        private static TimeSpan lastTotalProcessorTime;
        private static DateTime curTime;
        private static TimeSpan curTotalProcessorTime;

        static void Main(string[] args)
        {
            string processName = "OUTLOOK";

            Console.WriteLine("Press the any key to stop...\n");
            while (!Console.KeyAvailable)
            {
                Process[] pp = Process.GetProcessesByName(processName);
                if (pp.Length == 0)
                {
                    Console.WriteLine(processName + " does not exist");
                }
                else
                {
                    Process p = pp[0];
                    if (lastTime == null || lastTime == new DateTime())
                    {
                        lastTime = DateTime.Now;
                        lastTotalProcessorTime = p.TotalProcessorTime;
                    }
                    else
                    {
                        curTime = DateTime.Now;
                        curTotalProcessorTime = p.TotalProcessorTime;

                        double CPUUsage = (curTotalProcessorTime.TotalMilliseconds - lastTotalProcessorTime.TotalMilliseconds) / curTime.Subtract(lastTime).TotalMilliseconds / Convert.ToDouble(Environment.ProcessorCount);
                        Console.WriteLine("{0} CPU: {1:0.0}%",processName,CPUUsage * 100);

                        lastTime = curTime;
                        lastTotalProcessorTime = curTotalProcessorTime;
                    }
                }

                Thread.Sleep(250);
            }
        }
    }
}

您可以遍历进程来选择哪一个，或者如果您已经知道 id，只需使用此命令而不是 GetProcessesByName()

Process p = Process.GetProcessById(123);

Answer 3

我从几个答案（最明显的是this one）中收集了信息，并提出了以下代码，这些代码能够根据 Windows 提供的性能计数器信息获取有关当前进程的 CPU 和 RAM 使用情况的信息：

public object GetUsage()
{
    // Getting information about current process
    var process = Process.GetCurrentProcess();

    // Preparing variable for application instance name
    var name = string.Empty;

    foreach (var instance in new PerformanceCounterCategory("Process").GetInstanceNames())
    {
        if (instance.StartsWith(process.ProcessName))
        {
            using (var processId = new PerformanceCounter("Process", "ID Process", instance, true))
            {
                if (process.Id == (int)processId.RawValue)
                {
                    name = instance;
                    break;
                }
            }
        }
    }

    var cpu = new PerformanceCounter("Process", "% Processor Time", name, true);
    var ram = new PerformanceCounter("Process", "Private Bytes", name, true);

    // Getting first initial values
    cpu.NextValue();
    ram.NextValue();

    // Creating delay to get correct values of CPU usage during next query
    Thread.Sleep(500);

    dynamic result = new ExpandoObject();

    // If system has multiple cores, that should be taken into account
    result.CPU = Math.Round(cpu.NextValue() / Environment.ProcessorCount, 2);
    // Returns number of MB consumed by application
    result.RAM = Math.Round(ram.NextValue() / 1024 / 1024, 2);

    return result;
}

实例名称在没有任何破解或猜测的情况下确定，我也在关注多核。

检索到的信息与我在 VS 的进程资源管理器和性能窗口中看到的信息内联。

Answer 4

PerformanceCounter ProcessCPUCounter = new PerformanceCounter();
            ProcessCPUCounter.CategoryName = "Process";
            ProcessCPUCounter.CounterName = "% Processor Time";
            ProcessCPUCounter.InstanceName = "TestServiceName"; 
            ProcessCPUCounter.ReadOnly = true;

t3 = new Timer();
            t3.Tick += new EventHandler(ProcessCPUThread); // Everytime t3 ticks, th2_Tick will be called
            t3.Interval = (1000) * (1);              // Timer will tick evert second
            t3.Enabled = true;                       // Enable the t3
            t3.Start(); 

private void ProcessCPUThread(object sender, EventArgs e)
        {
            try
            {         
                Int32 processCPU = Convert.ToInt32( ProcessCPUCounter.NextValue());

                tbCPUperPrcocess.Text = Convert.ToString(processCPU / Environment.ProcessorCount);
            }
            catch (Exception ex)
            {

                MessageBox.Show(ex.Message.ToString());
            }
        }