线程池在c#中太慢了，有没有办法加速它?Thread.Sleep(0)和QueueUserWorkItem问题

我在一个需要做一些cpu密集型工作的c#应用程序中使用Threadpool。顺便说一下，它似乎太慢了(编辑:它每10秒只打印出调试字符串"Calculating on " + lSubArea.X + ":" + lSubArea.Y + " " + lSubArea.Width + ":" + lSubArea.Height几次，而我期望看到至少NUM_ROWS_GRID^2 = 16次每隔几秒)，也通过SetMinThreads方法改变MinThreads。我不知道是否切换到自定义线程，或者是否有办法加快它。在谷歌搜索返回一些结果，但没有工作;MSDN也是如此。

旧代码如下:

private void StreamerRoutine()
{
   if (this._state.Area.Width == 0 && this._state.Area.Height == 0)
      this._state.Area = new Rectangle(0, 0, Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
   while (this._state.WorkEnd == false)
   {
      // Ends time slice if video is off
      if (this._state.VideoOn == false)
         Thread.Sleep(0);
      else
      {
         lock(this._state.AreaSync)
         {
             Int32 lWidth = this._state.Area.Width / Constants.NUM_ROWS_GRID;
             Int32 lHeight = this._state.Area.Height / Constants.NUM_ROWS_GRID;
             for (Int32 lX = 0; lX + lWidth <= this._state.Area.Width; lX += lWidth)
                for (Int32 lY = 0; lY + lHeight <= this._state.Area.Height; lY += lHeight)
                   ThreadPool.QueueUserWorkItem(CreateDiffFrame, (Object)new Rectangle(lX, lY, lWidth, lHeight));
         }
      }
    }
}
private void CreateDiffFrame(Object pState)
{
   Rectangle lSubArea = (Rectangle)pState;
   SmartDebug.DWL("Calculating on " 
          + lSubArea.X + ":" + lSubArea.Y + " " 
          + lSubArea.Width + ":" + lSubArea.Height);
   // TODO : calculate frame
   Thread.Sleep(0);
}

编辑:CreateDiffFrame函数只是一个存根，我用来知道每秒调用多少次。它将被替换为CPU密集型工作，因为我定义了在这种情况下使用线程的最佳方式。

编辑:我删除了所有的Thread.Sleep(0);我认为这可能是一种加快日常工作的方法，但似乎它可能成为瓶颈。新代码如下:

编辑:我使WorkEnd和VideoOn易失性，以避免缓存值和无限循环;我还添加了一个信号量，使每一堆工作项在前一堆完成后开始。现在它工作得很好

private void StreamerRoutine()
    {
        if (this._state.Area.Width == 0 && this._state.Area.Height == 0)
            this._state.Area = new Rectangle(0, 0, Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
        this._state.StreamingSem = new Semaphore(Constants.NUM_ROWS_GRID * Constants.NUM_ROWS_GRID, Constants.NUM_ROWS_GRID * Constants.NUM_ROWS_GRID);

        while (this._state.WorkEnd == false)
        {
            if (this._state.VideoOn == true)
            {
                for (int i = 0; i < Constants.NUM_ROWS_GRID * Constants.NUM_ROWS_GRID; i++)
                    this._state.StreamingSem.WaitOne();
                lock(this._state.AreaSync)
                {
                    Int32 lWidth = this._state.Area.Width / Constants.NUM_ROWS_GRID;
                    Int32 lHeight = this._state.Area.Height / Constants.NUM_ROWS_GRID;
                    for (Int32 lX = 0; lX + lWidth <= this._state.Area.Width; lX += lWidth)
                        for (Int32 lY = 0; lY + lHeight <= this._state.Area.Height; lY += lHeight)
                            ThreadPool.QueueUserWorkItem(CreateDiffFrame, (Object)new Rectangle(lX, lY, lWidth, lHeight));
                }
            }
        }
    }
private void CreateDiffFrame(Object pState)
    {
        Rectangle lSubArea = (Rectangle)pState;
        SmartDebug.DWL("Calculating on " + lSubArea.X + ":" + lSubArea.Y + " " + lSubArea.Width + ":" + lSubArea.Height);
        // TODO : calculate frame
        this._state.StreamingSem.Release(1);
    }