Test.cs

gistfile1.txt

using System;
using System.Threading;
using System.Threading.Tasks;
using System.Threading.Tasks.Schedulers;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;

namespace Test
{
    public class Worker
    {
        async Task<int> f(Task<int> input)
        {
            return 1 + await input; // return output
        }

        [Benchmark]
        public void DoWork()
        {
            Task.Factory.StartNew(() =>
            {
                var tcs = new TaskCompletionSource<int>();
                (var left, var right) = ((Task<int>)null, f(tcs.Task));
                for (var i = 0; i < 100000; i++)
                {
                    left = f(right);
                    right = left;
                }
                tcs.SetResult(-1);
            }, CancellationToken.None, TaskCreationOptions.None, new StaTaskScheduler(2)).Wait();
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var summary = BenchmarkRunner.Run<Worker>();
            Console.WriteLine(summary);
        }
    }
}