Process.WorkingSet64 返回最大值 4294967295 [英] Process.WorkingSet64 returns max value of 4294967295

问题描述

我正在尝试使用 C# 监视另一个进程的内存.但是，Process.WorkingSet64 或 Process.PrivateMemorySize64 将输出的最大内存值是 4294967295.我也遇到了与性能计数器相同的问题.

I'm trying to monitor the memory of another process with C#. However, the maximum memory value that Process.WorkingSet64 or Process.PrivateMemorySize64 will output is 4294967295. I've also have the same problem with Performance Counters.

这是我的代码:

using System;
using System.Diagnostics;

namespace perfmon
{
    class Program
    {
        static void Main(string[] args)
        {
            int pid;
            if (int.TryParse(args[0], out pid))
            {
                var p = Process.GetProcessById(pid);

                var ramCounter = new PerformanceCounter("Process", "Working Set", p.ProcessName);
                Console.WriteLine($"ProcessName:{p.ProcessName}");

                var ram = ramCounter.NextValue();
                p.Refresh();

                Console.WriteLine("WorkingSet64\tPrivateMemorySize64\tRam PC");
                Console.WriteLine($"{p.WorkingSet64}\t{p.PrivateMemorySize64}\t\t{ram}");
            }

        }
    }
}

在带有 .net 4.61 的 Windows Server 2012 R2 上运行.

Running on Windows Server 2012 R2 with .net 4.61.

输出:

C:\XXX\perfmon>perfmon.exe 15800
ProcessName:XXX.Windows.Services
WorkingSet64    PrivateMemorySize64     Ram PC
4294967295      4294967295              4.294967E+09

进程的 Powershell 输出:

Powershell output for process:

PS C:\Users\xxx> get-process -id 15800 | select-object -property workingSet64
WorkingSet64
------------
5079859200

进程的任务列表输出:

C:\Users\xxx>tasklist /FI "PID eq 15800"

Image Name                     PID Session Name        Session#    Mem Usage
========================= ======== ================ =========== ============
XXX.Windows.Services         15800 Services                   0   5,031,424 K

如您所见，C# 进程在 4294967295 处停止.但是使用 powershell 或 tasklist 继续测量超过 4 GB 的内存.

As you can see, the C# process stops at 4294967295. However using powershell or tasklist continues to measure memory above 4 GB.

这是我的代码中的问题还是使用 C#/.net 进行内存测量的已知问题?

Is this a problem in my code or is this a known issue with memory measurement with C#/.net?

推荐答案

您无法从 32 位应用程序可靠地监视 64 位进程，Wow64 仿真器会处理数字以防止它们溢出 UInt32.MaxValue.只需移除抖动强制，您也可以作为 64 位进程运行.

You cannot reliably monitor a 64-bit process from a 32-bit app, numbers are cooked by the Wow64 emulator to prevent them from overflowing UInt32.MaxValue. Just remove the jitter forcing so you can run as a 64-bit process as well.

Project > Properties > Build tab > Platform target = AnyCPU，取消勾选 Prefer 32-bit.

Project > Properties > Build tab > Platform target = AnyCPU, untick Prefer 32-bit.

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