121 lines
2.8 KiB
Plaintext
121 lines
2.8 KiB
Plaintext
== Resources
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=== Documentation
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* https://learn.microsoft.com/en-us/dotnet/api/system.collections.ilist.item[IList.Item[Int32\]]
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* https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.ilist-1.item[IList<T>.Item[Int32\]]
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* https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.ireadonlylist-1.item[IReadonlyList<T>.Item[Int32\]]
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=== Benchmarks
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[options="header"]
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|===
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| Method | Runtime | Mean | Standard Deviation
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| ElementAt | .NET 7.0 | 15,193.1 ns | 233.47 ns
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| Index | .NET 7.0 | 9,465.6 ns | 148.16 ns
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| First | .NET 7.0 | 7,790.2 ns | 165.70 ns
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| First_Index | .NET 7.0 | 398.5 ns | 5.36 ns
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| Last | .NET 7.0 | 7,398.2 ns | 152.48 ns
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| Last_Index | .NET 7.0 | 347.3 ns | 5.47 ns
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| ElementAt | .NET Framework 4.6.2 | 12,205.7 ns | 298.49 ns
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| Index | .NET Framework 4.6.2 | 8,917.8 ns | 51.55 ns
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| First | .NET Framework 4.6.2 | 5,109.1 ns | 100.13 ns
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| First_Index | .NET Framework 4.6.2 | 566.0 ns | 6.56 ns
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| Last | .NET Framework 4.6.2 | 5,052.7 ns | 76.02 ns
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| Last_Index | .NET Framework 4.6.2 | 680.7 ns | 9.56 ns
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|===
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==== Glossary
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* https://en.wikipedia.org/wiki/Arithmetic_mean[Mean]
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* https://en.wikipedia.org/wiki/Standard_deviation[Standard Deviation]
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The results were generated by running the following snippet with https://github.com/dotnet/BenchmarkDotNet[BenchmarkDotNet]:
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[source,csharp]
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----
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private List<byte> data;
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private Random random;
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[Params(1_000_000)]
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public int SampleSize;
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[Params(1_000)]
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public int LoopSize;
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[GlobalSetup]
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public void Setup()
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{
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random = new Random(42);
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var bytes = new byte[SampleSize];
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random.NextBytes(bytes);
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data = bytes.ToList();
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}
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[Benchmark]
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public void ElementAt()
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{
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for (int i = 0; i < LoopSize; i++)
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{
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var index = random.Next(0, SampleSize);
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_ = data.ElementAt(index);
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}
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}
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[Benchmark]
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public void Index()
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{
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for (int i = 0; i < LoopSize; i++)
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{
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var index = random.Next(0, SampleSize);
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_ = data[index];
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}
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}
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[Benchmark]
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public void First()
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{
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for (int i = 0; i < LoopSize; i++)
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{
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_ = data.First();
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}
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}
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[Benchmark]
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public void First_Index()
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{
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for (int i = 0; i < LoopSize; i++)
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{
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_ = data[0];
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}
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}
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[Benchmark]
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public void Last()
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{
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for (int i = 0; i < LoopSize; i++)
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{
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_ = data.Last();
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}
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}
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[Benchmark]
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public void Last_Index()
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{
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for (int i = 0; i < LoopSize; i++)
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{
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_ = data[data.Count - 1];
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}
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}
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----
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Hardware configuration:
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----
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BenchmarkDotNet=v0.13.5, OS=Windows 10 (10.0.19045.2846/22H2/2022Update)
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11th Gen Intel Core i7-11850H 2.50GHz, 1 CPU, 16 logical and 8 physical cores
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.NET SDK=7.0.203
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[Host] : .NET 7.0.5 (7.0.523.17405), X64 RyuJIT AVX2
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.NET 7.0 : .NET 7.0.5 (7.0.523.17405), X64 RyuJIT AVX2
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.NET Framework 4.6.2 : .NET Framework 4.8.1 (4.8.9139.0), X64 RyuJIT VectorSize=256
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----
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