{
  // var cpuCores = 8;
  // var threads = cpuCores - 1;
  // var settingThreadOption = System.Threading.ThreadPool.SetMaxThreads(
  //     threads, threads);
  // var stopWatch = System.Diagnostics.Stopwatch.StartNew();

  var strings = new List<string>();
  var recordTimedList = new ConcurrentBag<string>();

  using (var finished = new System.Threading.CountdownEvent(1))
  {
      foreach (var @string in strings)
      {
          finished.AddCount();

          System.Threading.ThreadPool.QueueUserWorkItem((System.Threading.WaitCallback)(async (state) =>
          {
              try
              {
                  await WriteAsync(@string);
                  recordTimedList.Add(@string);
              }
              finally
              {
                  finished.Signal();
              }
          }));
      }

      finished.Signal();
      finished.Wait();
  }

  // stopWatch.Stop();
  // System.Diagnostics.Debug.WriteLine(
  //     $"Elapsed Time: {stopWatch.ElapsedMilliseconds} ms");
}