72 lines
2.3 KiB
Plaintext
72 lines
2.3 KiB
Plaintext
== Resources
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=== Documentation
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* https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.list-1.find[List<T>.Find(Predicate<T>)]
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* https://learn.microsoft.com/en-us/dotnet/api/system.array.find[Array.Find<T>(T[\], Predicate<T>)]
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* https://learn.microsoft.com/en-us/dotnet/api/system.collections.immutable.immutablelist-1.find[ImmutableList<T>.Find(Predicate<T>)]
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* https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.firstordefault[Enumerable.FirstOrDefault(Predicate<T>)]
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=== Benchmarks
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[options="header"]
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|===
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| Method | Runtime | Mean | Standard Deviation | Allocated
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| FirstOrDefault | .NET 7.0 | 5.373 ms | 0.1049 ms | 125 KB
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| Find | .NET 7.0 | 1.691 ms | 0.0334 ms | 85.94 KB
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| FirstOrDefault | .NET Framework 4.6.2 | 5.035 ms | 0.0421 ms | 125.38 KB
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| Find | .NET Framework 4.6.2 | 1.779 ms | 0.0107 ms | 86.2 KB
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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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* https://en.wikipedia.org/wiki/Memory_management[Allocated]
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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<string> data;
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private Random random = new Random();
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[Params(1_000)]
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public int N { get; set; }
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[GlobalSetup]
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public void Setup() =>
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data = Enumerable.Range(0, N).Select(x => Guid.NewGuid().ToString()).ToList();
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[Benchmark(Baseline = true)]
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public void FirstOrDefault()
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{
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for (var i = 0; i < N; i++)
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{
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var value = data[random.Next(N - 1)];
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_ = data.FirstOrDefault(x => x == value); // Enumerable.FirstOrDefault()
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}
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}
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[Benchmark]
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public void Find()
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{
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for (var i = 0; i < N; i++)
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{
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var value = data[random.Next(N - 1)];
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_ = data.Find(x => x == value); // List<T>.Find()
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}
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}
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----
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Hardware configuration:
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[source]
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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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[Host] : .NET Framework 4.8 (4.8.4614.0), X64 RyuJIT VectorSize=256
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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 (4.8.4614.0), X64 RyuJIT VectorSize=256
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----
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