SpinLockTest.cs

public class Program
{
    private const int iters = 1000 * 1000;
    public static void Main(string[] args)
    {
        bool lockTaken = false;
        var s = new SpinLock(false);
        s.Enter(ref lockTaken);

        if (!lockTaken)
        {
            Console.WriteLine("*** Error couldn't take lock!");
        }

        var sw = Stopwatch.StartNew();

        for (var i = 0; i < 1000; i++)
        {
            lockTaken = false;
            s.TryEnter(0, ref lockTaken);
        }

        sw.Stop();

        GC.Collect();

        sw.Restart();

        for (var i = 0; i < iters; i++)
        {
            lockTaken = false;
            s.TryEnter(0, ref lockTaken);
        }

        sw.Stop();

        Console.WriteLine(sw.Elapsed.TotalMilliseconds);

        Console.ReadLine();
    }
}