Timing layering SslStream on top of NetworkStream for reading/writing

PerfBlog06062017_SslStream_NetworkStream.cs

using System;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Security;
using System.Net.Sockets;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;
using System.Threading;
using System.Threading.Tasks;

class Test
{
    static void Main() => MainAsync().GetAwaiter().GetResult();
    static async Task MainAsync()
    {
        var certCollection = new X509Certificate2Collection();
        certCollection.Import("testcert.pfx", "testcertificate", X509KeyStorageFlags.DefaultKeySet);
        var serverCert = certCollection.Cast<X509Certificate2>().First(c => c.HasPrivateKey);

        using (Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
        using (Socket client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
        {
            listener.Bind(new IPEndPoint(IPAddress.Loopback, 0));
            listener.Listen(1);

            Task connectTask = Task.Run(() => client.Connect(listener.LocalEndPoint));
            using (Socket server = listener.Accept())
            {
                await connectTask;

                using (var serverStream = new SslStream(new NetworkStream(server, true), false, delegate { return true; }))
                using (var clientStream = new SslStream(new NetworkStream(client, true), false, delegate { return true; }))
                {
                    await Task.WhenAll(
                        serverStream.AuthenticateAsServerAsync(serverCert, false, SslProtocols.Tls12, false),
                        clientStream.AuthenticateAsClientAsync("localhost", null, SslProtocols.Tls12, false));

                    Task serverCopyAll = serverStream.CopyToAsync(Stream.Null);

                    byte[] data = new byte[1024];
                    new Random().NextBytes(data);

                    var sw = new Stopwatch();
                    int gen0 = GC.CollectionCount(0), gen1 = GC.CollectionCount(1), gen2 = GC.CollectionCount(2);
                    sw.Start();

                    for (int i = 0; i < 1_000_000; i++)
                    {
                        clientStream.Write(data, 0, data.Length);
                    }
                    clientStream.Dispose();

                    serverCopyAll.Wait();
                    sw.Stop();

                    Console.WriteLine($"Elapsed={sw.Elapsed} Gen0={GC.CollectionCount(0) - gen0} Gen1={GC.CollectionCount(1) - gen1} Gen2={GC.CollectionCount(2) - gen2}");
                }
            }
        }
    }
}