Count the number of threads created by Task.Run()

Question

I am benchmarking the performance of the BlockingCollection .

class Program
{
    private static BlockingCollection<int> bc = new BlockingCollection<int>(100000);
    private static BlockingCollection<int> bc2 = new BlockingCollection<int>(100000);
    static void Main(string[] args)
    {
        for (int i = 0; i < 100000; i++)
        {
            bc.TryAdd(i);

        }

        var stopWatch = new Stopwatch();
        stopWatch.Start();

        while (bc.Count != 0)
        {
            bc.Take();
        }
        stopWatch.Stop();

        Console.WriteLine("Simple " + stopWatch.Elapsed.TotalMilliseconds);
        createThreadPool(bc2);



        Console.Read();
    }

    static void ByTaskRun(BlockingCollection<int> blockingCollection)
    {
        for (int i = 0; i < 100000; i++)
        {
            blockingCollection.TryAdd(i);

        }
        var stopWatch = new Stopwatch();
        stopWatch.Start();
        Task k = Task.Run(() =>
        {
            while (blockingCollection.Count != 0)
            {
                blockingCollection.Take();
            }
        });

        stopWatch.Stop();

        Console.WriteLine("Task.run " + stopWatch.Elapsed.TotalMilliseconds);
    }
}

In the main() method, I simply take the elements from a blocking collection while in ByTaskRun() I run a task to take the elements out. I found that Task.Run() is a faster one. Does it create a Threadpool internally? If I want to to get the number of threads created by the Task.Run , how can I get that number?

Answer 1

In this sample Task.Run() use only one thread. And you get not actual working duration.