Created
December 12, 2021 12:59
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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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