Question

Im trying to see a performance difference between the following two programs (was expecting). But I find no difference. Is this normal? Im running on a Windows Core 2 Duo M/C
Visual Studio 2010 Express Edition

Program 1 (averaged over 100 runs: 824.11 ms):

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.Threading;


namespace MultiThreading
{
    class Program
    {
        public static Stopwatch stopwatch;
        static void Main(string[] args)
        {
            stopwatch = new Stopwatch();
            stopwatch.Start();
            //Thread t = new Thread(WriteY);
            //t.Start();
            for (int i = 0; i < 10000; i++)
            {
                Console.Write("x{0} ", i);
            }

            WriteY();

            Console.WriteLine("Time taken in milliseconds: {0}", stopwatch.ElapsedMilliseconds);
            Console.ReadLine();
        }

        static void WriteY()
        {
            for (int i = 0; i < 10000; i++)
            {
                Console.Write("y{0} ", i);
            }
            //Console.WriteLine("Time taken in milliseconds: {0}", stopwatch.ElapsedMilliseconds);
            //Console.ReadLine();
        }

Program 2(averaged over 100 runs: 828.11 ms):

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.Threading;


namespace MultiThreading
{
    class Program
    {
        public static Stopwatch stopwatch;
        static void Main(string[] args)
        {
            stopwatch = new Stopwatch();
            stopwatch.Start();
            Thread t = new Thread(WriteY);
            t.Start();
            for (int i = 0; i < 10000; i++)
            {
                Console.Write("x{0} ", i);
            }

            //WriteY();

            Console.WriteLine("Time taken in milliseconds: {0}", stopwatch.ElapsedMilliseconds);
            Console.ReadLine();
        }

        static void WriteY()
        {
            for (int i = 0; i < 10000; i++)
            {
                Console.Write("y{0} ", i);
            }
            //Console.WriteLine("Time taken in milliseconds: {0}", stopwatch.ElapsedMilliseconds);
            //Console.ReadLine();
        }
    }
}

Answer 1

My guess is that both are bound by the speed of Console.Write which presumably needs to lock the resource (the screen) so that only one thread accesses it at a time.