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Span vs Memory: add the buffer read benchmark and move BenchmarkDotNet to 0.15.4 #2193

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Span vs Memory: add the buffer read benchmark and move BenchmarkDotNet to 0.15.4 #2193

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14 changes: 14 additions & 0 deletions dotnet-performance/DifferencesBetweenSpanAndMemoryInCSharp/Benchmarks/Benchmarks.csproj
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<Project Sdk="Microsoft.NET.Sdk">

<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net10.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>

<ItemGroup>
<PackageReference Include="BenchmarkDotNet" Version="0.15.4" />
</ItemGroup>

</Project>
4 changes: 4 additions & 0 deletions dotnet-performance/DifferencesBetweenSpanAndMemoryInCSharp/Benchmarks/Program.cs
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using BenchmarkDotNet.Running;
using SpanMemoryBench;

BenchmarkRunner.Run<SpanVsMemoryReadBenchmark>();
64 changes: 64 additions & 0 deletions ...rformance/DifferencesBetweenSpanAndMemoryInCSharp/Benchmarks/SpanVsMemoryReadBenchmark.cs
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using BenchmarkDotNet.Attributes;

namespace SpanMemoryBench;

// The published benchmark slices a six element array once per operation, which lands under a
// nanosecond and is swamped by timer noise. This one reads a whole buffer, which is the work a
// caller actually does, and it separates the two ways of reading through Memory: asking for the
// Span on every element, and taking the Span once and looping over that.
[MemoryDiagnoser]
public class SpanVsMemoryReadBenchmark
{
private readonly int[] _data = CreateData();

private static int[] CreateData()
{
var data = new int[4096];
for (var i = 0; i < data.Length; i++)
{
data[i] = i;
}

return data;
}

[Benchmark(Description = "Sum through Span")]
public int SumThroughSpan()
{
var span = _data.AsSpan();
var sum = 0;
for (var i = 0; i < span.Length; i++)
{
sum += span[i];
}

return sum;
}

[Benchmark(Description = "Sum through Memory.Span per element")]
public int SumThroughMemory()
{
var memory = _data.AsMemory();
var sum = 0;
for (var i = 0; i < memory.Length; i++)
{
sum += memory.Span[i];
}

return sum;
}

[Benchmark(Description = "Sum through Memory, Span taken once")]
public int SumThroughMemorySpanTakenOnce()
{
var memory = _data.AsMemory();
var span = memory.Span;
var sum = 0;
for (var i = 0; i < span.Length; i++)
{
sum += span[i];
}

return sum;
}
}
26 changes: 26 additions & 0 deletions ...mance/DifferencesBetweenSpanAndMemoryInCSharp/DifferencesBetweenSpanAndMemoryInCSharp.sln
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Expand Up @@ -5,16 +5,42 @@ VisualStudioVersion = 17.8.34525.116
MinimumVisualStudioVersion = 10.0.40219.1
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DifferencesBetweenSpanAndMemoryInCSharp", "DifferencesBetweenSpanAndMemoryInCSharp\DifferencesBetweenSpanAndMemoryInCSharp.csproj", "{B9131A15-948F-4A88-B38C-ED4D4D1C4DB1}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Benchmarks", "Benchmarks\Benchmarks.csproj", "{E940AB59-73DD-4930-AA0F-3B8901377AE3}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Debug|x64 = Debug|x64
Debug|x86 = Debug|x86
Release|Any CPU = Release|Any CPU
Release|x64 = Release|x64
Release|x86 = Release|x86
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{E940AB59-73DD-4930-AA0F-3B8901377AE3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{E940AB59-73DD-4930-AA0F-3B8901377AE3}.Debug|Any CPU.Build.0 = Debug|Any CPU
{E940AB59-73DD-4930-AA0F-3B8901377AE3}.Debug|x64.ActiveCfg = Debug|Any CPU
{E940AB59-73DD-4930-AA0F-3B8901377AE3}.Debug|x64.Build.0 = Debug|Any CPU
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{E940AB59-73DD-4930-AA0F-3B8901377AE3}.Release|Any CPU.Build.0 = Release|Any CPU
{E940AB59-73DD-4930-AA0F-3B8901377AE3}.Release|x64.ActiveCfg = Release|Any CPU
{E940AB59-73DD-4930-AA0F-3B8901377AE3}.Release|x64.Build.0 = Release|Any CPU
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{E940AB59-73DD-4930-AA0F-3B8901377AE3}.Release|x86.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
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2 changes: 1 addition & 1 deletion ...rp/DifferencesBetweenSpanAndMemoryInCSharp/DifferencesBetweenSpanAndMemoryInCSharp.csproj
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Expand Up @@ -8,7 +8,7 @@
</PropertyGroup>

<ItemGroup>
<PackageReference Include="BenchmarkDotNet" Version="0.13.12" />
<PackageReference Include="BenchmarkDotNet" Version="0.15.4" />
</ItemGroup>

</Project>
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