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dotnet-benchmarking

Measure C#/.NET performance with BenchmarkDotNet instead of stopwatches. USE FOR: BenchmarkDotNet console project setup, BenchmarkSwitcher.FromAssembly; [Benchmark]/[Benchmark(Baseline = true)]; [Params]; [GlobalSetup]/[GlobalCleanup]; [MemoryDiagnoser] allocation columns; [BenchmarkCategory]/[GroupBenchmarksBy]/[CategoriesColumn]/[HideColumns]; reading Mean/Error/StdDev/Ratio/Allocated results and BenchmarkDotNet.Artifacts output; avoiding dead-code elimination via return values; comparing .NET runtimes/versions via AddJob/WithRuntime; ManualConfig job classes with WithEnvironmentVariable and RatioStyle.Trend; testing environment-variable variants via .runsettings, `dotnet test -e`/`-s`, Visual Studio run-settings. DO NOT USE FOR: SIMD API selection (dotnet-simd, has its own SIMD-width benchmarking config); LINQ/enumerable tradeoffs (dotnet-enumerable); generic math (dotnet-generic-math).

中文简介正在准备中。当前显示原文说明。

NetFabric/NetFabric.Numerics星标 36(GitHub 36 + cccskills 0)

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包含的文件（5）

SKILL.md3.6 KB
references/comparing-configurations.md2.8 KB
references/interpreting-results.md2.7 KB
references/runtime-variant-testing.md1.8 KB
references/writing-benchmarks.md3.2 KB

SKILL.md（原文）

安装前可以查看交给 AI 代理的指令内容。

.NET Benchmarking with BenchmarkDotNet

Requires using BenchmarkDotNet.Attributes; / using BenchmarkDotNet.Running; (package BenchmarkDotNet, from NuGet). The JIT applies deeper optimizations only after code runs "hot" for a while, so a plain Stopwatch around one call misrepresents steady-state performance — BenchmarkDotNet runs enough iterations across pipeline/warmup/actual stages to account for this.

Setup

Create a console app, add the BenchmarkDotNet package.
Replace Program.cs:

using BenchmarkDotNet.Running;

BenchmarkSwitcher.FromAssembly(typeof(Program).Assembly).Run(args);

Run in Release, without a debugger: dotnet run -c Release. Pick which benchmark(s) to run from the printed menu.

Writing a Benchmark

[MemoryDiagnoser]
public class ListBenchmarks
{
    List<int> list;

    [Params(10, 1_000)]
    public int Count { get; set; }

    [GlobalSetup]
    public void GlobalSetup() => list = Enumerable.Range(0, Count).ToList();

    [Benchmark(Baseline = true)]
    public int Foreach()
    {
        var sum = 0;
        foreach (var item in list) sum += item;
        return sum;   // always return computed results — otherwise the JIT may eliminate the loop
    }

    [Benchmark]
    public int Foreach_AsSpan()
    {
        var sum = 0;
        foreach (var item in CollectionsMarshal.AsSpan(list)) sum += item;
        return sum;
    }
}

One [Benchmark(Baseline = true)] per class (or per category) anchors the Ratio column. [Params] on a property multiplies every benchmark across each listed value, populated via [GlobalSetup] (inline field init would run before Count is assigned).

Reference Files

File	Load When
references/writing-benchmarks.md	Project setup detail, benchmark attribute reference (`[Benchmark]`, `[Params]`, `[GlobalSetup]`/`[GlobalCleanup]`), avoiding JIT dead-code elimination
references/interpreting-results.md	Results table columns, `[MemoryDiagnoser]` allocation columns, `[BenchmarkCategory]`/`[GroupBenchmarksBy]`/`[HideColumns]`, artifact file locations
references/comparing-configurations.md	Multi-job `ManualConfig` classes, comparing .NET runtimes/versions with `AddJob`/`WithRuntime`, custom environment-variable jobs, `RatioStyle.Trend`
references/runtime-variant-testing.md	Testing code under environment-variable variants outside benchmarks: `.runsettings` files, `dotnet test -e`/`-s`, Visual Studio run-settings selection

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3d-rotation-theory

免费

Abstract math for 3D rotation representations and conversions. USE FOR: understanding axis-angle representation; Euler angles (yaw/pitch/roll, convention choices); rotation matrices (SO(3)); quaternion-based rotation; converting between representations; identifying and avoiding gimbal lock; composing rotations; half-angle formula; right-hand rule. DO NOT USE FOR: quaternion arithmetic details (use quaternion-algebra); slerp/lerp interpolation (use interpolation-on-manifolds); coordinate system definitions (use coordinate-system-conversions).

中文简介正在准备中。当前显示原文说明。