.net异步性能测试（包括ASP.NET MVC WebAPI异步方法）

很久没有写博客了，今年做的产品公司这两天刚刚开了发布会，稍微清闲下来，想想我们做的产品还有没有性能优化空间，于是想到了.Net的异步可以优化性能，但到底能够提升多大的比例呢？恰好有一个朋友正在做各种语言的异步性能测试（有关异步和同步的问题，请参考客《AIO与BIO接口性能对比》），于是我今天写了一个C#的测试程序。

首先，建一个 ASP.NET MVC WebAPI项目，在默认的控制器 values里面，增加两个方法：

 // GET api/values?sleepTime=10
        [HttpGet]
        public async Task<string> ExecuteAIO(int sleepTime)
        {
            await Task.Delay(sleepTime);
            return  "Hello world,"+ sleepTime;
        }

        [HttpGet]
        // GET api/values?sleepTime2=10
        public string ExecuteBIO(int sleepTime2)
        {
            System.Threading.Thread.Sleep(sleepTime2);
            return "Hello world," + sleepTime2;
        }

然后，建立一个控制台程序，来测试这个web API：

 class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("按任意键开始测试 WebAPI:http://localhost:62219/api/values?sleepTime={int}");
            Console.Write("请输入线程数：");
            int threadNum = 100;
            int.TryParse(Console.ReadLine(), out threadNum);
            while (Test(threadNum)) ;

            Console.ReadLine();
            Console.ReadLine();
        }

        private static bool Test(int TaskNumber)
        {
            Console.Write("请输入此API方法的睡眠时间（毫秒）,输入非数字内容退出：");
            string input = Console.ReadLine();
            int SleepTime = 50;
            if (!int.TryParse(input, out SleepTime))
                return false;
            HttpClient client = new HttpClient();
            client.BaseAddress = new Uri("http://localhost:62219/");
            var result = client.GetStringAsync("api/values?sleepTime=" + input).Result;
            Console.WriteLine("Result:{0}", result);
            //int TaskNumber = 1000;


            Console.WriteLine("{0}次 BIO（同步）测试(睡眠{1} 毫秒)：", TaskNumber, SleepTime);
            System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();


            sw.Start();
            Task[] taskArr = new Task[TaskNumber];
            for (int i = 0; i < TaskNumber; i++)
            {
                Task task = client.GetStringAsync("api/values?sleepTime2=" + SleepTime);
                taskArr[i] = task;

            }
            Task.WaitAll(taskArr);
            sw.Stop();
            double useTime1 = sw.Elapsed.TotalSeconds;
            Console.WriteLine("耗时（秒）：{0},QPS:{1,10:f2}", useTime1, TaskNumber/useTime1);
            sw.Reset();

            Console.WriteLine("{0}次 AIO（异步）测试(睡眠{1} 毫秒)：", TaskNumber, SleepTime);
            sw.Start();
            for (int i = 0; i < TaskNumber; i++)
            {
                Task task = client.GetStringAsync("api/values?sleepTime=" + SleepTime);
                taskArr[i] = task;
            }
            Task.WaitAll(taskArr);
            sw.Stop();
            double useTime2 = sw.Elapsed.TotalSeconds;
            Console.WriteLine("耗时（秒）：{0},QPS:{1,10:f2}", useTime2, TaskNumber / useTime2);
            return true;
        }
    }

View Code