Parallel.ForEach 之 MaxDegreeOfParallelism

参考：Max Degree of Parallelism最大并行度配置

结论：

1. 与设置的线程数有关
2. 有设置的并行度有关

测试如下：

@@@code
System.Threading.ThreadPool.SetMinThreads(20, 20);
            System.Threading.ThreadPool.SetMinThreads(50, 50);

			var list = GetIPByMask(IPAddress.Parse("192.168.10.1"), IPAddress.Parse("255.255.255.0"));
            System.Diagnostics.Stopwatch stopwatch = new System.Diagnostics.Stopwatch();
            stopwatch.Start();
            Parallel.ForEach(list, new ParallelOptions() { MaxDegreeOfParallelism=6},  a =>
               {

			var status = Ping(a.ToString(), (ip, ex) => Console.WriteLine($"ping {ip},{ex.Message}"), 1000);
                   Console.WriteLine($"at {DateTime.Now.Second} ping {a.ToString()}
								{status.ToString()}");
               }
                );

			//foreach (var a in list)

			//{

			//    var status = Ping(a.ToString(), (ip, ex) => Console.WriteLine($"ping {ip},{ex.Message}"), 1000);

			//    Console.WriteLine($"at {DateTime.Now.Second} ping {a.ToString()} {status.ToString()}");

			//}
				            Console.WriteLine($"平均每秒处理：{(int)Math.Ceiling( list.Count/stopwatch.Elapsed.TotalSeconds)}" );
            Console.Read();
@@#

1. 不设置线程数，不限制并行数，每秒约9个

1. 不使用并行,等到花都谢了

1. 增加线程数，

不限制并行数

并行设为2

并行设为6