C# 为什么我的性能监控值与任务管理器中的值不完全相同？

Question

我按照接受的答案Using PerformanceCounter to Track Memory and CPU Usage

但我发现任务管理器中的结果值不同：

var processName = Process.GetCurrentProcess().ProcessName;
PerformanceCounter ramCounter = new PerformanceCounter("Process", "Working Set", processName);
PerformanceCounter cpuCounter = new PerformanceCounter("Process", "% Processor Time", processName);
while (true)
{
    Thread.Sleep(500);
    double ram = ramCounter.NextValue();
    double cpu = cpuCounter.NextValue();
    Console.WriteLine("RAM: " + (ram / 1024 / 1024) + " MB; CPU: " + (cpu) + " %");
 }

代码正确吗？如何在任务管理器中获得完全相同的值？

Answer 1

您的代码即将完成，但需要一点改进：

1. "Process"-"% Processor Time" 始终返回系统中所有 CPU 的 CPU 使用率。所以返回值应该除以Environment.ProcessorCount。这是任务管理器显示的实际值
2. 正如 Hans Passant 在这个答案中所说的 How to calculate private working set (memory)? 任务管理器实际上使用"Process", "Working Set - Private" 但不是 "Process"-"Working Set"

最终代码：

        var processName = Process.GetCurrentProcess().ProcessName;
        PerformanceCounter ramCounter = new PerformanceCounter("Process", "Working Set - Private", processName);
        PerformanceCounter cpuCounter = new PerformanceCounter("Process", "% Processor Time", processName);

        while (true)
        {
            double ram = ramCounter.NextValue();
            double cpu = cpuCounter.NextValue() / Environment.ProcessorCount;

            Console.Clear();
            Console.WriteLine("RAM: "
                              + (ram / 1024).ToString("N0") + " KB; CPU: "
                              + cpu.ToString("N1") + " %;");

            Thread.Sleep(500);
        }