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quiz10.cs

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// quiz10.cs
// this program is offered as is with no warranty implied and confers no rights .

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

namespace Quiz10
{
    class Program
    {
        [ThreadStatic]
        private static Dictionary myItems = new Dictionary();

        private static LocalDataStoreSlot slotStatic;

        [ThreadStatic]
        private static Data myData = new Data();

        class Data
        {
            public int i = 0;
        }

        static void Main(string[] args)
        {
            slotStatic = Thread.AllocateNamedDataSlot("foo");
            Thread.SetData(slotStatic, new Data());
            myItems["foo"] = new Data();

            const int count = 10000000;

            // get any jitting out of the way
            Test1();
            Test2();
            Test3();
            Test4();

            int i = 0;

            System.Diagnostics.Stopwatch s = new System.Diagnostics.Stopwatch();

            s.Start();
            for (i = 0; i < count; i++) Test1();
            s.Stop();

            Console.WriteLine("Test1: Named Slot {0:n0}ms", s.ElapsedMilliseconds);

            s.Reset();

            s.Start();
            for (i = 0; i < count; i++) Test2();
            s.Stop();

            Console.WriteLine("Test2: Numbered Slot {0:n0}ms", s.ElapsedMilliseconds);

            s.Reset();
            s.Start();
            for (i = 0; i < count; i++) Test3();
            s.Stop();

            Console.WriteLine("Test3: Thread-local dictionary {0:n0}ms", s.ElapsedMilliseconds);

            s.Reset();
            s.Start();
            for (i = 0; i < count; i++) Test4();
            s.Stop();

            Console.WriteLine("Test4: Thread-local direct {0:n0}ms", s.ElapsedMilliseconds);
        }

        [System.Runtime.CompilerServices.MethodImplAttribute(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]
        static void Test1()
        {
            LocalDataStoreSlot slot = Thread.GetNamedDataSlot("foo");
            Data d = (Data)Thread.GetData(slot);
            d.i++;
        }

        [System.Runtime.CompilerServices.MethodImplAttribute(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]
        static void Test2()
        {
            Data d = (Data)Thread.GetData(slotStatic);
            d.i++;
        }

        [System.Runtime.CompilerServices.MethodImplAttribute(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]
        static void Test3()
        {
            Data d = myItems["foo"];
            d.i++;
        }

        [System.Runtime.CompilerServices.MethodImplAttribute(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]
        static void Test4()
        {
            myData.i++;
        }
   }
}

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