BufferedStream的性能

 

以下代码可以对比FileStream 和BufferedStream的性能,但一定要注意BufferedStream初始时第二个参数一定要比第一个参数的流的大小要大,不然内存缓存就可能用不上

 

static void Main(string[] args)
        {
            Random rd = new Random();
            byte[] bb=new byte[1024];
            rd.NextBytes(bb);

            FileStream fs = new FileStream(@"C:\Users\jim\Desktop\aaaaa\aa.txt",FileMode.OpenOrCreate,FileAccess.ReadWrite);

            BufferedStream bs = new BufferedStream(fs, 1024 * 10240);

            DateTime dt;
            double db1 = 0, db2 = 0;
            
            dt = System.DateTime.Now;

            for (int i = 0; i < 10240; i++)
            {
                fs.Write(bb, 0, 1000);
            }

            db1 = ((TimeSpan)(DateTime.Now - dt)).TotalMilliseconds;

            dt = System.DateTime.Now;

            for (int i = 0; i < 10240; i++)
            {
                bs.Write(bb, 0, 1000);
            }

            db2 = ((TimeSpan)(DateTime.Now - dt)).TotalMilliseconds;

            Console.WriteLine(db1.ToString("f4"));
            Console.WriteLine(db2.ToString("f4"));
            Console.ReadKey();
            
        }