Mono ThreadPool 并发问题 [英] Mono ThreadPool concurrency issues

问题描述

我编写了一款使用 ThreadPool 进行多线程处理的软件.

I wrote one software that uses ThreadPool for multithreading.

ThreadPool.SetMinThreads(128, 128);
ThreadPool.SetMaxThreads(512, 512);

for (int i = 0; i < 40; i++)
{
    ThreadPool.QueueUserWorkItem(_ =>
    {
        Console.Write("!");
        Thread.Sleep(1000);
        Console.Write(".");
    }, null);
}

在每个线程中，我执行阻塞网络操作(使用 http).围绕阻塞网络模型设计的软件，我无法转向非阻塞 1 线程 I/O.

Inside each thread I perform blocking network operations(work with http). Software designed around blocking network model and I cannot move to non blocking 1 threaded I/O.

它在 Windows 平台上完美运行，我可以在每个内核上使用 128-512 个线程，没有任何问题，一切正常.但是当我转向单声道时，我看到了一些非常奇怪的行为.我不能让 mono 在每个 CPU 内核上运行多个线程，我可以获得的最大值 - 每个内核 1 个线程，这与我在 SetMinThreads/SetMaxThreads 中指定的内容无关.

It works perfect on windows platform, I can use 128-512 threads per one core without any issues, all work as it should work. But when I moved to mono, I saw some really strange behaviour. I cannot make mono run many threads per one CPU core, max I can get - 1 thread per core, doesn't matter what I do specify in SetMinThreads/SetMaxThreads.

在 Linux 下使用 .NET 4/4.5、MONO 版本 3.2.1 和我以前的系统上的一些旧版本进行了尝试.顺便说一句，纯线程代码效果很好，例如这给出了预期的结果:

tried under Linux with .NET 4/4.5, MONO version 3.2.1 and some older version on my previous system. Btw, plain threading code works well, for example this gives desired result:

for (int i = 0; i < 20; i++)
{
   var t = new Thread(_ => {
      Console.Write("!");
      Thread.Sleep(1000);
      Console.Write(".");
   });
   t.Start();
}

推荐答案

我们还对 mono 进行了很多试验，看起来以下帮助:

We've also experimented alot with mono and looks that following helps:

1. 将环境变量 MONO_THREADS_PER_CPU 设置为更高的值.例如导出 MONO_THREADS_PER_CPU=300 (linux).我不确定，但如果没有设置每个 cpu 更多线程"，您将无法通过 setmin/max 线程调整线程池.
2. 使用 --server 开关运行单声道，但它从 3.2.3 开始工作.这里解释http://www.mono-project.com/Release_Notes_Mono_3.2，但只有在没有足够的线程被触发时，这个标志才可能在启动时有帮助.

1. setup environment variable MONO_THREADS_PER_CPU to higher values. for example export MONO_THREADS_PER_CPU=300 (linux). I'am not sure but looks that you can't tweak threadpool by setmin/max threads without "more threads per cpu" set.
2. run mono with --server switch, but it works starting from 3.2.3. here explanation http://www.mono-project.com/Release_Notes_Mono_3.2 , but may be this flag helps at start only when not enough threads fired.

我们在 linux 上同时使用 options 和 mono 的速度非常快(与 windows 上的 .net 相当)

We're using both options and mono on linux acting quite fast( comparable to .net on windows )

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