mem.cs

class Program
{
    static ManualResetEvent _produce = new ManualResetEvent(false);
    static ManualResetEvent _consume = new ManualResetEvent(false);
    private static void Run()
    {
        while (true)
        {
            _produce.WaitOne();
            _produce.Reset();

            ComputeHash();

            Console.WriteLine("Done");
            _consume.Set();
        }
    }

    [MethodImpl(MethodImplOptions.NoInlining)]
    static void ComputeHash()
    {
        var b = new byte[1024 * 1024 * 128];
        MD5.Create().ComputeHash(b);
    }

    static void Main(string[] args)
    {
        Console.WriteLine("Press enter to start");
        Console.ReadLine();

        new Thread(Run)
        {
            IsBackground = true,
        }.Start();

        while (true)
        {
            _produce.Set();
            _consume.WaitOne();
            _consume.Reset();
            GC.Collect(2);
            GC.WaitForPendingFinalizers();
            Console.WriteLine(GC.GetTotalMemory(true));
            Console.ReadLine();
        }
    }
}