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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).

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NetFabric/NetFabric.Numerics36 stars(GitHub 36 + cccskills 0)

Run score Not tested

See how to install

Files included (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 (original)

Review the instructions the agent will receive before you install.

.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

  1. Create a console app, add the BenchmarkDotNet package.
  2. Replace Program.cs:
using BenchmarkDotNet.Running;

BenchmarkSwitcher.FromAssembly(typeof(Program).Assembly).Run(args);
  1. 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

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

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