学步园

namespace Microshaoft
{
    using System;
    using System.Diagnostics;
    using System.Threading;
    using System.Threading.Tasks;
    using System.Runtime.InteropServices;
    public static class CodeTimer
    {
        public static void Initialize()
        {
            Process.GetCurrentProcess().PriorityClass = ProcessPriorityClass.High;
            Thread.CurrentThread.Priority = ThreadPriority.Highest;
            Time("", 1, () => { });
        }
        public static void ParallelTime(string name, int iteration, int maxDegreeOfParallelism, Action action)
        {
            InternalIterationProcess
                    (
                        name
                        , iteration
                        , () =>
                            {
                                Parallel.For
                                            (
                                                0
                                                , iteration
                                                , new ParallelOptions()
                                                            {
                                                                MaxDegreeOfParallelism = maxDegreeOfParallelism
                                                                //, TaskScheduler = null
                                                            }
                                                , i =>
                                                    {
                                                        action();
                                                    }
                                            );
                            }
                    );
        }
        private static void InternalIterationProcess(string name, int iteration, Action action)
        {
            if (string.IsNullOrEmpty(name))
            {
                return;
            }
            // 1.
            ConsoleColor currentForeColor = Console.ForegroundColor;
            Console.ForegroundColor = ConsoleColor.Yellow;
            Console.WriteLine(name);
            // 2.
            GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);
            int[] gcCounts = new int[GC.MaxGeneration + 1];
            for (int i = 0; i <= GC.MaxGeneration; i++)
            {
                gcCounts[i] = GC.CollectionCount(i);
            }
            // 3.
            Stopwatch watch = new Stopwatch();
            watch.Start();
            ulong cycleCount = GetCycleCount();
            action();
            ulong cpuCycles = GetCycleCount() - cycleCount;
            watch.Stop();
            // 4.
            Console.ForegroundColor = currentForeColor;
            Console.WriteLine
                            (
                                "{0}Time Elapsed:{0}{1}ms"
                                , "\t"
                                , watch.ElapsedMilliseconds.ToString("N0")
                            );
            Console.WriteLine
                            (
                                "{0}CPU Cycles:{0}{1}"
                                , "\t"
                                , cpuCycles.ToString("N0")
                            );
            // 5.
            for (int i = 0; i <= GC.MaxGeneration; i++)
            {
                int count = GC.CollectionCount(i) - gcCounts[i];
                Console.WriteLine
                            (
                                "{0}Gen{1}:{0}{0}{2}"
                                , "\t"
                                , i
                                , count
                            );
            }
            Console.WriteLine();
        }
        public static void Time(string name, int iteration, Action action)
        {
            InternalIterationProcess
                                (
                                    name
                                    , iteration
                                    , () =>
                                        {
                                            for (int i = 0; i < iteration; i++)
                                            {
                                                action();
                                            }
                                        }
                                    );
        }
        private static ulong GetCycleCount()
        {
            ulong cycleCount = 0;
            QueryThreadCycleTime(GetCurrentThread(), ref cycleCount);
            return cycleCount;
        }
        [DllImport("kernel32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        static extern bool QueryThreadCycleTime(IntPtr threadHandle, ref ulong cycleTime);
        [DllImport("kernel32.dll")]
        static extern IntPtr GetCurrentThread();
    }
}