LinkedList perf test 01

perf.LinkedList.Program.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;

namespace LinkedListApp
{
    class Program
    {
        private static void Main(string[] args)
        {
            const int count = 20000000;

            for (var i = 0; i < 5; i++)
            {
                Console.WriteLine("Test Run #" + (i + 1));
                Console.WriteLine();

                Test1(count);
                Console.WriteLine();
                
                GC.Collect();
            }

            Console.Write("Press enter to end program...");
            Console.ReadLine();
        }

        private static void Test1(int count = 20000000)
        {
            var ll = new LinkedList<int>();
            var list = new List<int>();
            var sw = new Stopwatch();
            double t1, t2, t3, t4;
            int y = 0, z = 0;

            var rand = new Random();
            var nodes = new LinkedListNode<int>[count];
            var values = new int[count];
            for (var i = 0; i < count; ++i)
            {
                values[i] = rand.Next();
                nodes[i] = new LinkedListNode<int>(values[i]);
            }

            // LinkedList add
            sw.Start();
            LinkedListNode<int> lastNode = null;
            for (int x = 0; x < count; ++x)
            {
                var node = nodes[x];
                if (lastNode != null)
                    ll.AddAfter(lastNode, node);
                else
                    ll.AddLast(node);
                lastNode = node;
            }
            sw.Stop();
            t1 = sw.Elapsed.TotalMilliseconds;

            // List add
            sw.Restart();            
            for (int x = 0; x < count; ++x) list.Add(values[x]);
            sw.Stop();
            t2 = sw.Elapsed.TotalMilliseconds;

            // LinkedList Iterate
            sw.Restart();
            foreach (var i in ll) ++y;
            sw.Stop();
            t3 = sw.Elapsed.TotalMilliseconds;

            
            // List Iterate
            sw.Restart();
            foreach (var i in list) ++z;
            sw.Stop();
            t4 = sw.Elapsed.TotalMilliseconds;

            // Output times...
            Console.WriteLine("\tLinked List Insert: " + t1 + "ms");
            Console.WriteLine("\tList Insert: " + t2 + "ms");
            Console.WriteLine("\tLinked List Iterate: " + t3 + "ms");
            Console.WriteLine("\tList Iterate: " + t4 + "ms");
        }
    }
}