ArrayPool.Rent vs new byte[] test(netcoreapp2.0-preview1)

ArrayPoolTest.cs

using System;
using System.Buffers;

namespace bufferpooltest
{
    class Program
    {
        const int LoopCount = 100000000;
        static void ArrayPoolTest(int loopCount, int bufferSize)
        {
            var arrayPool = ArrayPool<byte>.Create();
            var sw = new System.Diagnostics.Stopwatch();
            sw.Start();
            for (int i = 0; i < loopCount; i++)
            {
                var x = arrayPool.Rent(bufferSize);
                if(i % DebugOutInterval == DebugOutInterval - 1)
                {
                    Console.WriteLine($"ArrayPoolTest: {i},{sw.Elapsed},{x.Length}");
                }
                arrayPool.Return(x);
            }
            Console.WriteLine($"ArrayPoolTest: {loopCount},{bufferSize} {sw.Elapsed}");
        }
        static void ArrayAllocTest(int loopCount, int bufferSize)
        {
            var sw = new System.Diagnostics.Stopwatch();
            sw.Start();
            for (int i = 0; i < loopCount; i++)
            {
                var x = new byte[bufferSize];
                if(i % DebugOutInterval == DebugOutInterval - 1)
                {
                    Console.WriteLine($"ArrayAlloclTest: {i},{sw.Elapsed},{x.Length}");
                }
            }
            Console.WriteLine($"ArrayAllocTest: {loopCount},{bufferSize} {sw.Elapsed}");
        }
        static void Main(string[] args)
        {
            var bufferSizes = new int[]{128,1024,2048,4096};
            foreach(var s in bufferSizes)
            {
                ArrayAllocTest(LoopCount, s);
                GC.Collect();
                ArrayPoolTest(LoopCount, s);
                GC.Collect();
            }
            Console.WriteLine("Hello World!");
        }
    }
}

TestResult.txt

ArrayAlloclTest: 9999999,00:00:00.1106672,128
ArrayAlloclTest: 19999999,00:00:00.2227236,128
ArrayAlloclTest: 29999999,00:00:00.3317979,128
ArrayAlloclTest: 39999999,00:00:00.4406508,128
ArrayAlloclTest: 49999999,00:00:00.5490262,128
ArrayAlloclTest: 59999999,00:00:00.6603859,128
ArrayAlloclTest: 69999999,00:00:00.7692854,128
ArrayAlloclTest: 79999999,00:00:00.8763516,128
ArrayAlloclTest: 89999999,00:00:00.9873895,128
ArrayAlloclTest: 99999999,00:00:01.1003446,128
ArrayAllocTest: 100000000,128 00:00:01.1003733
ArrayPoolTest: 9999999,00:00:00.4810451,128
ArrayPoolTest: 19999999,00:00:00.9603920,128
ArrayPoolTest: 29999999,00:00:01.4346641,128
ArrayPoolTest: 39999999,00:00:01.9043537,128
ArrayPoolTest: 49999999,00:00:02.3786909,128
ArrayPoolTest: 59999999,00:00:02.8633888,128
ArrayPoolTest: 69999999,00:00:03.3375458,128
ArrayPoolTest: 79999999,00:00:03.8238313,128
ArrayPoolTest: 89999999,00:00:04.3044378,128
ArrayPoolTest: 99999999,00:00:04.7784071,128
ArrayPoolTest: 100000000,128 00:00:04.7784300
ArrayAlloclTest: 9999999,00:00:00.5434343,1024
ArrayAlloclTest: 19999999,00:00:01.0657269,1024
ArrayAlloclTest: 29999999,00:00:01.5931273,1024
ArrayAlloclTest: 39999999,00:00:02.1295977,1024
ArrayAlloclTest: 49999999,00:00:02.7581321,1024
ArrayAlloclTest: 59999999,00:00:03.3733426,1024
ArrayAlloclTest: 69999999,00:00:03.9318894,1024
ArrayAlloclTest: 79999999,00:00:04.4597736,1024
ArrayAlloclTest: 89999999,00:00:05.0034323,1024
ArrayAlloclTest: 99999999,00:00:05.5356571,1024
ArrayAllocTest: 100000000,1024 00:00:05.5356792
ArrayPoolTest: 9999999,00:00:00.4730527,1024
ArrayPoolTest: 19999999,00:00:00.9495306,1024
ArrayPoolTest: 29999999,00:00:01.4159467,1024
ArrayPoolTest: 39999999,00:00:01.8992200,1024
ArrayPoolTest: 49999999,00:00:02.3675463,1024
ArrayPoolTest: 59999999,00:00:02.8373386,1024
ArrayPoolTest: 69999999,00:00:03.3215655,1024
ArrayPoolTest: 79999999,00:00:03.7972639,1024
ArrayPoolTest: 89999999,00:00:04.2863314,1024
ArrayPoolTest: 99999999,00:00:04.7698559,1024
ArrayPoolTest: 100000000,1024 00:00:04.7698804
ArrayAlloclTest: 9999999,00:00:01.0020104,2048
ArrayAlloclTest: 19999999,00:00:02.0195303,2048
ArrayAlloclTest: 29999999,00:00:03.0236119,2048
ArrayAlloclTest: 39999999,00:00:04.0987027,2048
ArrayAlloclTest: 49999999,00:00:05.0835414,2048
ArrayAlloclTest: 59999999,00:00:06.2099468,2048
ArrayAlloclTest: 69999999,00:00:07.1976442,2048
ArrayAlloclTest: 79999999,00:00:08.1790506,2048
ArrayAlloclTest: 89999999,00:00:09.1467722,2048
ArrayAlloclTest: 99999999,00:00:10.1357124,2048
ArrayAllocTest: 100000000,2048 00:00:10.1357375
ArrayPoolTest: 9999999,00:00:00.5265798,2048
ArrayPoolTest: 19999999,00:00:01.0632286,2048
ArrayPoolTest: 29999999,00:00:01.5375568,2048
ArrayPoolTest: 39999999,00:00:02.0155721,2048
ArrayPoolTest: 49999999,00:00:02.4838317,2048
ArrayPoolTest: 59999999,00:00:02.9525738,2048
ArrayPoolTest: 69999999,00:00:03.4228786,2048
ArrayPoolTest: 79999999,00:00:03.8963465,2048
ArrayPoolTest: 89999999,00:00:04.3658048,2048
ArrayPoolTest: 99999999,00:00:04.8336355,2048
ArrayPoolTest: 100000000,2048 00:00:04.8336581
ArrayAlloclTest: 9999999,00:00:01.8774235,4096
ArrayAlloclTest: 19999999,00:00:03.8640532,4096
ArrayAlloclTest: 29999999,00:00:05.9720277,4096
ArrayAlloclTest: 39999999,00:00:08.0498230,4096
ArrayAlloclTest: 49999999,00:00:10.0782852,4096
ArrayAlloclTest: 59999999,00:00:12.2521059,4096
ArrayAlloclTest: 69999999,00:00:14.4667327,4096
ArrayAlloclTest: 79999999,00:00:16.5709712,4096
ArrayAlloclTest: 89999999,00:00:18.7097100,4096
ArrayAlloclTest: 99999999,00:00:20.8527043,4096
ArrayAllocTest: 100000000,4096 00:00:20.8527580
ArrayPoolTest: 9999999,00:00:00.4666563,4096
ArrayPoolTest: 19999999,00:00:00.9483300,4096
ArrayPoolTest: 29999999,00:00:01.4235654,4096
ArrayPoolTest: 39999999,00:00:01.9020009,4096
ArrayPoolTest: 49999999,00:00:02.3731174,4096
ArrayPoolTest: 59999999,00:00:02.8424418,4096
ArrayPoolTest: 69999999,00:00:03.3059197,4096
ArrayPoolTest: 79999999,00:00:03.7872849,4096
ArrayPoolTest: 89999999,00:00:04.2522695,4096
ArrayPoolTest: 99999999,00:00:04.7320734,4096
ArrayPoolTest: 100000000,4096 00:00:04.7320985
Hello World!