Benchmark parallelization

tests/ImageSharp.Benchmarks/LoadResizeSave/LoadResizeSaveStressRunner.cs

@@ -6,6 +6,7 @@
 using System.Drawing.Imaging;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
+using System.Runtime.Versioning;
 using ImageMagick;
 using PhotoSauce.MagicScaler;
 using SixLabors.ImageSharp.Formats;
@@ -27,6 +28,7 @@ public enum JpegKind
     Any = Baseline | Progressive
 }
 
+[SupportedOSPlatform("windows")]
 public class LoadResizeSaveStressRunner
 {
     private const int Quality = 75;
@@ -158,7 +160,7 @@ private string OutputPath(string inputPath, [CallerMemberName] string postfix =
             this.outputDirectory,
             Path.GetFileNameWithoutExtension(inputPath) + "-" + postfix + Path.GetExtension(inputPath));
 
-    private (int Width, int Height) ScaledSize(int inWidth, int inHeight, int outSize)
+    private static (int Width, int Height) ScaledSize(int inWidth, int inHeight, int outSize)
     {
         int width, height;
         if (inWidth > inHeight)
@@ -180,7 +182,7 @@ public void SystemDrawingResize(string input)
         using SystemDrawingImage image = SystemDrawingImage.FromFile(input, true);
         this.LogImageProcessed(image.Width, image.Height);
 
-        (int width, int height) = this.ScaledSize(image.Width, image.Height, this.ThumbnailSize);
+        (int width, int height) = ScaledSize(image.Width, image.Height, this.ThumbnailSize);
         Bitmap resized = new(width, height);
         using Graphics graphics = Graphics.FromImage(resized);
         using ImageAttributes attributes = new();
@@ -282,7 +284,7 @@ public void SkiaCanvasResize(string input)
     {
         using SKBitmap original = SKBitmap.Decode(input);
         this.LogImageProcessed(original.Width, original.Height);
-        (int width, int height) = this.ScaledSize(original.Width, original.Height, this.ThumbnailSize);
+        (int width, int height) = ScaledSize(original.Width, original.Height, this.ThumbnailSize);
         using SKSurface surface = SKSurface.Create(new SKImageInfo(width, height, original.ColorType, original.AlphaType));
         using SKPaint paint = new() { FilterQuality = SKFilterQuality.High };
         SKCanvas canvas = surface.Canvas;
@@ -300,7 +302,7 @@ public void SkiaBitmapResize(string input)
     {
         using SKBitmap original = SKBitmap.Decode(input);
         this.LogImageProcessed(original.Width, original.Height);
-        (int width, int height) = this.ScaledSize(original.Width, original.Height, this.ThumbnailSize);
+        (int width, int height) = ScaledSize(original.Width, original.Height, this.ThumbnailSize);
         using SKBitmap resized = original.Resize(new SKImageInfo(width, height), SKFilterQuality.High);
         if (resized == null)
         {
@@ -319,7 +321,7 @@ public void SkiaBitmapDecodeToTargetSize(string input)
 
         SKImageInfo info = codec.Info;
         this.LogImageProcessed(info.Width, info.Height);
-        (int width, int height) = this.ScaledSize(info.Width, info.Height, this.ThumbnailSize);
+        (int width, int height) = ScaledSize(info.Width, info.Height, this.ThumbnailSize);
         SKSizeI supportedScale = codec.GetScaledDimensions((float)width / info.Width);
 
         using SKBitmap original = SKBitmap.Decode(codec, new SKImageInfo(supportedScale.Width, supportedScale.Height));

tests/ImageSharp.Benchmarks/Processing/ParallelProcessing.cs

@@ -0,0 +1,65 @@
+// Copyright (c) Six Labors.
+// Licensed under the Six Labors Split License.
+
+using BenchmarkDotNet.Attributes;
+using SixLabors.ImageSharp.PixelFormats;
+using SixLabors.ImageSharp.Processing;
+using SixLabors.ImageSharp.Tests;
+
+namespace SixLabors.ImageSharp.Benchmarks;
+
+public class ParallelProcessing
+{
+    private Image<Rgba32> image;
+    private Image<Rgba32> foreground;
+    private Configuration configuration;
+
+    public static IEnumerable<int> MaxDegreeOfParallelismValues()
+    {
+        int processorCount = Environment.ProcessorCount;
+        for (int p = 1; p <= processorCount; p *= 2)
+        {
+            yield return p;
+        }
+
+        if ((processorCount & (processorCount - 1)) != 0)
+        {
+            yield return processorCount;
+        }
+    }
+
+    [ParamsSource(nameof(MaxDegreeOfParallelismValues))]
+    public int MaxDegreeOfParallelism { get; set; }
+
+    [GlobalSetup]
+    public void Setup()
+    {
+        this.image = new Image<Rgba32>(2048, 2048);
+        this.foreground = new Image<Rgba32>(2048, 2048);
+        this.configuration = Configuration.Default.Clone();
+        this.configuration.MaxDegreeOfParallelism = this.MaxDegreeOfParallelism;
+    }
+
+    [Benchmark]
+    public void DetectEdges() => this.image.Mutate(this.configuration, x => x.DetectEdges());
+
+    [Benchmark]
+    public void DrawImage() => this.image.Mutate(this.configuration, x => x.DrawImage(this.foreground, 0.5f));
+
+    [Benchmark]
+    public void Crop()
+    {
+        Rectangle bounds = this.image.Bounds;
+        bounds = new Rectangle(1, 1, bounds.Width - 2, bounds.Height - 2);
+        this.image
+            .Clone(this.configuration, x => x.Crop(bounds))
+            .Dispose();
+    }
+
+    [GlobalCleanup]
+    public void Cleanup()
+    {
+        this.image.Dispose();
+        this.foreground.Dispose();
+    }
+}

tests/ImageSharp.Tests.ProfilingSandbox/ImageSharp.Tests.ProfilingSandbox.csproj

@@ -8,7 +8,6 @@
     <Prefer32Bit>false</Prefer32Bit>
     <RootNamespace>SixLabors.ImageSharp.Tests.ProfilingSandbox</RootNamespace>
     <RuntimeIdentifier>win-x64</RuntimeIdentifier>
-    <StartupObject>SixLabors.ImageSharp.Tests.ProfilingSandbox.Program</StartupObject>
     <!--Used to hide test project from dotnet test-->
     <IsTestProject>false</IsTestProject>
     <EnsureNETCoreAppRuntime>false</EnsureNETCoreAppRuntime>

tests/ImageSharp.Tests.ProfilingSandbox/LoadResizeSaveParallelMemoryStress.cs

@@ -3,6 +3,7 @@
 
 using System.Diagnostics;
 using System.Globalization;
+using System.Runtime.Versioning;
 using System.Text;
 using CommandLine;
 using CommandLine.Text;
@@ -13,7 +14,8 @@
 namespace SixLabors.ImageSharp.Tests.ProfilingSandbox;
 
 // See ImageSharp.Benchmarks/LoadResizeSave/README.md
-internal class LoadResizeSaveParallelMemoryStress
+[SupportedOSPlatform("windows")]
+internal sealed class LoadResizeSaveParallelMemoryStress
 {
     private LoadResizeSaveParallelMemoryStress()
     {
@@ -206,14 +208,15 @@ public string GetMarkdown()
             StringBuilder bld = new();
             bld.AppendLine($"| {nameof(this.TotalSeconds)} | {nameof(this.MegapixelsPerSec)} | {nameof(this.MegapixelsPerSecPerCpu)} |");
             bld.AppendLine(
+                CultureInfo.InvariantCulture,
                 $"| {L(nameof(this.TotalSeconds))} | {L(nameof(this.MegapixelsPerSec))} | {L(nameof(this.MegapixelsPerSecPerCpu))} |");
 
             bld.Append("| ");
-            bld.AppendFormat(F(nameof(this.TotalSeconds)), this.TotalSeconds);
+            bld.AppendFormat(CultureInfo.InvariantCulture, F(nameof(this.TotalSeconds)), this.TotalSeconds);
             bld.Append(" | ");
-            bld.AppendFormat(F(nameof(this.MegapixelsPerSec)), this.MegapixelsPerSec);
+            bld.AppendFormat(CultureInfo.InvariantCulture, F(nameof(this.MegapixelsPerSec)), this.MegapixelsPerSec);
             bld.Append(" | ");
-            bld.AppendFormat(F(nameof(this.MegapixelsPerSecPerCpu)), this.MegapixelsPerSecPerCpu);
+            bld.AppendFormat(CultureInfo.InvariantCulture, F(nameof(this.MegapixelsPerSecPerCpu)), this.MegapixelsPerSecPerCpu);
             bld.AppendLine(" |");
 
             return bld.ToString();
@@ -223,7 +226,7 @@ public string GetMarkdown()
         }
     }
 
-    private class CommandLineOptions
+    private sealed class CommandLineOptions
     {
         [Option('a', "async-imagesharp", Required = false, Default = false, HelpText = "Async ImageSharp without benchmark switching")]
         public bool AsyncImageSharp { get; set; }