如何设置线程数Parallel.ForEach [英] How set thread count Parallel.ForEach

问题描述

我设置了10个线程数，但是它可以在3个线程中工作.(我有三核处理器)

I set number of thread 10, but it works in 3 threads.(I have triple-core processor)

Parallel.ForEach(list,
new ParallelOptions { MaxDegreeOfParallelism = 10 },
                () => Thread.CurrentThread.ManagedThreadId,
                (i, loopState, threadId) =>
                {
                    var cells = i.Split(';');
                    var ip = cells[0];
                    var login = cells[1];
                    var pass = cells[2];
                    try
                    {
                        using (var client = new SshClient(ip, login, pass))
                        {
                            client.Connect();
                            var port = new ForwardedPortLocal("localhost", 10000 + (uint)threadId, "ya.ru", 80);
                            port.Start();
                            client.AddForwardedPort(port);
                            newList.Add(ip);
                            port.Stop();
                            client.Disconnect();
                        }
                    }
                    catch
                    {


                    }

                    return threadId;
                },
                (t

hreadId) => { }

推荐答案

仅MaxDegreeOfParallelism 的用途限制最多可以使用多少个线程.这并不意味着系统将使用多个线程.

决定使用多少线程. TaskScheduler [ ^ ].您可以使用默认的调度程序，也可以创建自己的调度程序，但是从我的角度来看，标准调度程序通常可以做出明智的决定.

The purpose of MaxDegreeOfParallelism is only to restrict how many threads can be used in maximum. It doesn''t meant that the system will use s many threads.

The decision how many threads are used is done by the TaskScheduler[^]. You can either stick with the default scheduler or create your own, but from my point of view the standard scheduler is usually making good decisions.

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