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| using BenchmarkDotNet.Attributes; | |
| using BenchmarkDotNet.Running; | |
| namespace SpanTDemo | |
| { | |
| class Program | |
| { | |
| static void Main(string[] args) | |
| { | |
| //BenchmarkRunner.Run<BenchmarkDemo1>(); | |
| BenchmarkRunner.Run<BenchmarkDemo2>(); | |
| } | |
| } | |
| [MemoryDiagnoser] | |
| public class BenchmarkDemo1 | |
| { | |
| private int[] _myArray; | |
| [Params(100, 1000, 10000)] | |
| public int Size { get; set; } | |
| [GlobalSetup] | |
| public void SetUp() | |
| { | |
| _myArray = new int[Size]; | |
| for (int index = 0; index < Size; index++) | |
| { | |
| _myArray[index] = index; | |
| } | |
| } | |
| [Benchmark(Baseline = true)] | |
| public int[] Original() | |
| { | |
| return _myArray.Skip(Size / 2).Take(Size / 4).ToArray(); | |
| } | |
| [Benchmark] | |
| public int[] ArrayCopy() | |
| { | |
| var copy = new int[Size / 4]; | |
| Array.Copy(_myArray, Size / 2, copy, 0, Size / 4); | |
| return copy; | |
| } | |
| [Benchmark] | |
| public Span<int> Span() | |
| { | |
| return _myArray.AsSpan().Slice(Size / 2, Size / 4); | |
| } | |
| } | |
| [MemoryDiagnoser] | |
| public class BenchmarkDemo2 | |
| { | |
| private static readonly string _dateString = "01 05 1991"; | |
| [Benchmark(Baseline = true)] | |
| public DateTime Original() | |
| { | |
| var day = _dateString.Substring(0, 2); | |
| var month = _dateString.Substring(3, 2); | |
| var year = _dateString.Substring(6); | |
| return new DateTime(int.Parse(year), int.Parse(month), int.Parse(day)); | |
| } | |
| [Benchmark] | |
| public DateTime Span() | |
| { | |
| ReadOnlySpan<char> dateSpan = _dateString; | |
| var day = dateSpan.Slice(0, 2); | |
| var month = dateSpan.Slice(3, 2); | |
| var year = dateSpan.Slice(6); | |
| return new DateTime(int.Parse(year), int.Parse(month), int.Parse(day)); | |
| } | |
| } | |
| } |
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