MimeTypes/ManagedCode.MimeTypes.StartupProbe/Program.cs at main · managedcode/MimeTypes

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using System.Runtime.CompilerServices;

using ManagedCode.MimeTypes;

var input = args.Length == 0 ? "https://cdn.example.test/assets/photo.png?v=1" : args[0];

var allocationControl = args.Length > 1 && args[1] == "--allocation-control";

var mime = MimeHelper.GetMimeType("asset.png");

var extensions = MimeHelper.GetExtensions(mime);

var knownMimeTypes = MimeHelper.GetKnownMimeTypes();

var result = MeasureLookups(input, allocationControl);

Report(result.Mime, extensions.Count, knownMimeTypes.Count, result.Allocated);

// Keep output infrastructure outside the lookup allocation measurement.

[MethodImpl(MethodImplOptions.NoInlining)]

static void Report(string mime, int extensionCount, int knownCount, long allocated)

{

Console.WriteLine($"{mime}|{extensionCount}|{knownCount}|{allocated}");

}

// Only the harness bypasses tiering: the library keeps the requested JIT mode.

// This prevents tier transitions of the measuring loop from polluting its counter.

[MethodImpl(MethodImplOptions.NoInlining | MethodImplOptions.AggressiveOptimization)]

static (string Mime, long Allocated) MeasureLookups(string input, bool allocationControl)

{

var before = GC.GetAllocatedBytesForCurrentThread();

if (allocationControl)

{

GC.KeepAlive(new byte[1024]);

}

var mime = string.Empty;

for (var index = 0; index < 100_000; index++)

{

mime = MimeHelper.GetMimeType(input);

}

return (mime, GC.GetAllocatedBytesForCurrentThread() - before);

}