c# - 如何在 C#（托管代码）中获取 *THREAD* 的 CPU 使用率和/或 RAM 使用率？

Question

我知道如何获取进程的 CPU 使用率和内存使用率，但我想知道如何在每个线程级别上获取它。如果最好的解决方案是做一些 P-Invoking，那也没关系。

我需要的示例：

Thread myThread = Thread.CurrentThread;

// some time later in some other function...

Console.WriteLine(GetThreadSpecificCpuUsage(myThread));

Answer 1

如前所述，内存使用无法回答，因为这是整个进程的属性，但 CPU 使用：

Process p = Process.GetCurrentProcess(); // getting current running process of the app
foreach (ProcessThread pt in p.Threads)
{
    // use pt.Id / pt.TotalProcessorTime / pt.UserProcessorTime / pt.PrivilegedProcessorTime
}

Answer 2

您无法获取每个线程的内存使用情况，因为内存在进程中的所有线程之间共享。操作系统如何知道您是否在一个线程中分配内存并在另一个线程中使用它。这意味着什么？

Answer 3

这是一个执行您想要的操作的示例 http://www.codeproject.com/KB/system/processescpuusage.aspx

Answer 4

这是一个简单的程序，它启动 5 个消耗不同 CPU 量的线程，然后匹配哪个托管线程消耗多少 CPU。

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading;

class Program
{
[DllImport("Kernel32", EntryPoint = "GetCurrentThreadId", ExactSpelling = true)]
public static extern Int32 GetCurrentWin32ThreadId();

static void Main(string[] args)
{
    Dictionary<int, Thread> threads = new Dictionary<int, Thread>();

    // Launch the threads
    for (int i = 0; i < 5; i++)
    {
        Thread cpuThread = new Thread((start) =>
        {
            lock (threads)
            {
                threads.Add(GetCurrentWin32ThreadId(), Thread.CurrentThread);
            }

            ConsumeCPU(20 * (int)start);
        });
        cpuThread.Name = "T" + i;
        cpuThread.Start(i);
    }

    // Every second wake up and see how much CPU each thread is using.
    Thread monitoringThread = new Thread(() =>
        {
            Stopwatch watch = new Stopwatch();
            watch.Start();

            while (true)
            {
                Thread.Sleep(1000);
                Console.Write("\r");

                double totalTime = ((double)watch.ElapsedMilliseconds);
                if (totalTime > 0)
                {
                    Process p = Process.GetCurrentProcess();
                    foreach (ProcessThread pt in p.Threads)
                    {
                        Thread managedThread;
                        if (threads.TryGetValue(pt.Id, out managedThread))
                        {
                            double percent = (pt.TotalProcessorTime.TotalMilliseconds / totalTime);
                            Console.Write("{0}-{1:0.00} ", managedThread.Name, percent);
                        }
                    }
                }
            }
        });
    monitoringThread.Start();
}


// Helper function that generates a percentage of CPU usage
public static void ConsumeCPU(int percentage)
{
    Stopwatch watch = new Stopwatch();
    watch.Start();
    while (true)
    {
        if (watch.ElapsedMilliseconds > percentage)
        {
            Thread.Sleep(100 - percentage);
            watch.Reset();
            watch.Start();
        }
    }
}
}

请注意，CLR 可能会更改托管线程在其下执行的本机线程。但是，在实践中，我不确定这种情况实际发生的频率。