emulate leaks in LoadResizeSaveParallelMemoryStress

tests/ImageSharp.Benchmarks/LoadResizeSave/LoadResizeSaveStressRunner.cs

@@ -13,6 +13,7 @@ using System.Threading.Tasks;
 using ImageMagick;
 using PhotoSauce.MagicScaler;
 using SixLabors.ImageSharp.Formats.Jpeg;
+using SixLabors.ImageSharp.Memory;
 using SixLabors.ImageSharp.Processing;
 using SixLabors.ImageSharp.Tests;
 using SkiaSharp;
@@ -53,6 +54,9 @@ namespace SixLabors.ImageSharp.Benchmarks.LoadResizeSave
 
         public int ThumbnailSize { get; set; } = 150;
 
+        // Inject leaking memory allocation requests to ImageSharp processing code to stress-test finalizer behavior.
+        public bool EmulateLeakedAllocations { get; set; }
+
         private static readonly string[] ProgressiveFiles =
         {
             "ancyloscelis-apiformis-m-paraguay-face_2014-08-08-095255-zs-pmax_15046500892_o.jpg",
@@ -180,6 +184,12 @@ namespace SixLabors.ImageSharp.Benchmarks.LoadResizeSave
             using var image = ImageSharpImage.Load(input);
             this.IncreaseTotalMegapixels(image.Width, image.Height);
 
+            if (this.EmulateLeakedAllocations)
+            {
+                _ = Configuration.Default.MemoryAllocator.Allocate<long>(image.Width * image.Height);
+                _ = Configuration.Default.MemoryAllocator.Allocate<byte>(1 << 21);
+            }
+
             image.Mutate(i => i.Resize(new ResizeOptions
             {
                 Size = new ImageSharpSize(this.ThumbnailSize, this.ThumbnailSize),
@@ -191,6 +201,11 @@ namespace SixLabors.ImageSharp.Benchmarks.LoadResizeSave
 
             // Save the results
             image.Save(output, this.imageSharpJpegEncoder);
+
+            if (this.EmulateLeakedAllocations)
+            {
+                _ = Configuration.Default.MemoryAllocator.Allocate2D<long>(image.Width, image.Height);
+            }
         }
 
         public void MagickResize(string input)

tests/ImageSharp.Tests.ProfilingSandbox/LoadResizeSaveParallelMemoryStress.cs

@@ -58,6 +58,8 @@ namespace SixLabors.ImageSharp.Tests.ProfilingSandbox
                     MemoryAllocator.Default = Configuration.Default.MemoryAllocator = options.CreateMemoryAllocator();
                 }
 
+                lrs.Benchmarks.EmulateLeakedAllocations = options.LeakAllocations;
+
                 timer = Stopwatch.StartNew();
                 try
                 {
@@ -235,6 +237,9 @@ namespace SixLabors.ImageSharp.Tests.ProfilingSandbox
             [Option('t', "trim-period", Required = false, Default = null, HelpText = "Trim period for the pool in seconds")]
             public int? TrimTimeSeconds { get; set; }
 
+            [Option('l', "leak-allocations", Required = false, Default = false, HelpText = "Inject leaking memory allocation requests to stress-test finalizer behavior.")]
+            public bool LeakAllocations { get; set; }
+
             public static CommandLineOptions Parse(string[] args)
             {
                 CommandLineOptions result = null;
@@ -252,7 +257,7 @@ namespace SixLabors.ImageSharp.Tests.ProfilingSandbox
             }
 
             public override string ToString() =>
-                $"p({this.MaxDegreeOfParallelism})_i({this.ImageSharp})_d({this.KeepDefaultAllocator})_m({this.MaxContiguousPoolBufferMegaBytes})_s({this.MaxPoolSizeMegaBytes})_u({this.MaxCapacityOfNonPoolBuffersMegaBytes})_r({this.RepeatCount})_g({this.FinalGcCount})_e({this.ReleaseRetainedResourcesAtEnd})";
+                $"p({this.MaxDegreeOfParallelism})_i({this.ImageSharp})_d({this.KeepDefaultAllocator})_m({this.MaxContiguousPoolBufferMegaBytes})_s({this.MaxPoolSizeMegaBytes})_u({this.MaxCapacityOfNonPoolBuffersMegaBytes})_r({this.RepeatCount})_g({this.FinalGcCount})_e({this.ReleaseRetainedResourcesAtEnd}_l({this.LeakAllocations}))";
 
             public MemoryAllocator CreateMemoryAllocator()
             {
@@ -285,7 +290,22 @@ namespace SixLabors.ImageSharp.Tests.ProfilingSandbox
 
         private void SystemDrawingBenchmarkParallel() => this.ForEachImage(this.Benchmarks.SystemDrawingResize);
 
-        private void ImageSharpBenchmarkParallel() => this.ForEachImage(this.Benchmarks.ImageSharpResize);
+        private void ImageSharpBenchmarkParallel()
+        {
+            int cnt = 0;
+            this.ForEachImage(f =>
+            {
+                this.Benchmarks.ImageSharpResize(f);
+                if (cnt % 4 == 0 && this.Benchmarks.EmulateLeakedAllocations)
+                {
+                    GC.Collect();
+                    GC.WaitForPendingFinalizers();
+                    GC.Collect();
+                }
+
+                cnt++;
+            });
+        }
 
         private void MagickBenchmarkParallel() => this.ForEachImage(this.Benchmarks.MagickResize);