问题描述
我刚刚使用此链接 如下:
Console.WriteLine("Number of Threads: {0}", System.Diagnostics.Process.GetCurrentProcess().Threads.Count);
int count = 0;
Parallel.For(0, 50000, options,(i, state) =>
{
count++;
});
Console.WriteLine("Number of Threads: {0}", System.Diagnostics.Process.GetCurrentProcess().Threads.Count);
Console.ReadKey();
它在 Parellel.For 之前为我提供了 15 个线程，在它仅提供了 17 个线程之后.所以只有 2 个线程被 Parellel.For 占用.
It gives me 15 thread before Parellel.For and after it gives me 17 thread only. So only 2 thread is occupy with Parellel.For.
然后我使用此链接创建了另一个示例代码，如下所示:
Then I have created a another sample code using This Link like below:
var options = new ParallelOptions { MaxDegreeOfParallelism = Environment.ProcessorCount * 10 };
Console.WriteLine("MaxDegreeOfParallelism : {0}", Environment.ProcessorCount * 10);
Console.WriteLine("Number of Threads: {0}", System.Diagnostics.Process.GetCurrentProcess().Threads.Count);
int count = 0;
Parallel.For(0, 50000, options,(i, state) =>
{
count++;
});
Console.WriteLine("Number of Threads: {0}", System.Diagnostics.Process.GetCurrentProcess().Threads.Count);
Console.ReadKey();
在上面的代码中，我将 MaxDegreeOfParallelism 设置为 40，但仍然为 Parallel.For 使用相同的线程.
In above code, I have set MaxDegreeOfParallelism where it sets 40 but is still taking same threads for Parallel.For.
那么如何增加Parallel.For的运行线程?
So how can I increase running thread for Parallel.For?
推荐答案
并行循环使用硬件 CPU 内核.如果您的 CPU 有 2 个内核，则这是您的机器可以达到的最大并行度.
Parallel loops use hardware CPU cores. If your CPU has 2 cores, this is the maximum degree of paralellism that you can get in your machine.
默认情况下，并行度(即在硬件中同时运行多少次迭代)取决于可用内核数.在典型场景中，您的核心数越多有，你的循环执行得越快，直到你到达阿姆达尔定律预测的收益递减.多快取决于您的循环所做的工作类型.
进一步阅读:
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