Parallel.For test

parallelfor.cs

        static void Main(string[] args)
        {
            for (int j = 0; j < 10; j++)
            {
                bool par = (j & 1) == 1;
                var sw = Stopwatch.StartNew();
                if (par)
                {
                    Parallel.For(0, 4, test);
                }
                else
                {
                    test(0);
                }
                sw.Stop();
                Console.WriteLine("{0}: {1}", par ? "par" : "seq", sw.ElapsedTicks);
            }

        }

        static volatile int r;

        static void test(int x)
        {
            int s = 0;
            for (int i = 0; i < 1000000000; i++)
            {
                s += x + i;
            }
            r = s;
        }