Cache line contention

Program.cs

using System.Diagnostics;

internal class Program
{
	static long[] counters; 
	const int timeLimit = 20 * 1000;
	static void Count(int index)
	{
		Stopwatch sw = Stopwatch.StartNew();
		while(sw.ElapsedMilliseconds < timeLimit)
		{
			counters[index]++;
		}
	}
	private static void Main(string[] args)
	{
		int stride = 1; // 128/sizeof(long);

		Thread[] threads = new Thread[Environment.ProcessorCount];
		counters = new long[threads.Length * stride];

		for (int i = 0; i < threads.Length; i++)
		{
			threads[i] = StartThread(i * stride);
		}

		Wait(threads);
		Console.WriteLine(counters.Sum() / 1000000.0);
	}

	private static void Wait(Thread[] threads)
	{
		foreach (Thread t in threads)
		{
			t.Join();
		}
	}

	private static Thread StartThread(int index)
	{		
		Thread thread = new Thread(() => Count(index));
		thread.Start();
		return thread;
	}
}