Report renderer transport pool memory usage in fps line

src/Avalonia.Base/Avalonia.Base.csproj

@@ -35,6 +35,7 @@
     <InternalsVisibleTo Include="Avalonia.Skia.UnitTests, PublicKey=$(AvaloniaPublicKey)" />
     <InternalsVisibleTo Include="Avalonia.UnitTests, PublicKey=$(AvaloniaPublicKey)" />
     <InternalsVisibleTo Include="Avalonia.Web.Blazor, PublicKey=$(AvaloniaPublicKey)" />
+    <InternalsVisibleTo Include="Avalonia.Dialogs, PublicKey=$(AvaloniaPublicKey)" />
     <InternalsVisibleTo Include="DynamicProxyGenAssembly2, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c547cac37abd99c8db225ef2f6c8a3602f3b3606cc9891605d02baa56104f4cfc0734aa39b93bf7852f7d9266654753cc297e7d2edfe0bac1cdcf9f717241550e0a7b191195b7667bb4f64bcb8e2121380fd1d9d46ad2d92d2d15605093924cceaf74c4861eff62abf69b9291ed0a340e113be11e6a7d3113e92484cf7045cc7" />
   </ItemGroup>
 

src/Avalonia.Base/Rendering/Composition/Server/FpsCounter.cs

@@ -35,7 +35,7 @@ internal class FpsCounter
 
     public void FpsTick() => _framesThisSecond++;
 
-    public void RenderFps(IDrawingContextImpl context)
+    public void RenderFps(IDrawingContextImpl context, string aux)
     {
         var now = _stopwatch.Elapsed;
         var elapsed = now - _lastFpsUpdate;
@@ -50,7 +50,7 @@ internal class FpsCounter
             _lastFpsUpdate = now;
         }
 
-        var fpsLine = $"Frame #{_totalFrames:00000000} FPS: {_fps:000}";
+        var fpsLine = $"Frame #{_totalFrames:00000000} FPS: {_fps:000} " + aux;
         double width = 0;
         double height = 0;
         foreach (var ch in fpsLine)

src/Avalonia.Base/Rendering/Composition/Server/ServerCompositionTarget.cs

@@ -134,10 +134,19 @@ namespace Avalonia.Rendering.Composition.Server
                         , null, _dirtyRect);
                 }
 
-                if(DrawFps)
-                    _fpsCounter.RenderFps(targetContext);
+                if (DrawFps)
+                {
+                    var nativeMem = ByteSizeHelper.ToString((ulong)(
+                        (Compositor.BatchMemoryPool.CurrentUsage + Compositor.BatchMemoryPool.CurrentPool)  *
+                                                    Compositor.BatchMemoryPool.BufferSize), false);
+                    var managedMem = ByteSizeHelper.ToString((ulong)(
+                        (Compositor.BatchObjectPool.CurrentUsage + Compositor.BatchObjectPool.CurrentPool) *
+                                                                     Compositor.BatchObjectPool.ArraySize *
+                                                                     IntPtr.Size), false);
+                    _fpsCounter.RenderFps(targetContext, $"M:{managedMem} / N:{nativeMem}");
+                }
+
                 _dirtyRect = Rect.Empty;
-                
             }
         }
 

src/Avalonia.Base/Rendering/Composition/Server/ServerCompositor.cs

@@ -24,8 +24,8 @@ namespace Avalonia.Rendering.Composition.Server
         private List<ServerCompositionTarget> _activeTargets = new();
         private HashSet<IAnimationInstance> _activeAnimations = new();
         private List<IAnimationInstance> _animationsToUpdate = new();
-        private BatchStreamObjectPool<object?> _batchObjectPool;
-        private BatchStreamMemoryPool _batchMemoryPool;
+        internal BatchStreamObjectPool<object?> BatchObjectPool;
+        internal BatchStreamMemoryPool BatchMemoryPool;
         private object _lock = new object();
         public IPlatformGpuContext? GpuContext { get; }
 
@@ -34,8 +34,8 @@ namespace Avalonia.Rendering.Composition.Server
         {
             GpuContext = platformGpu?.PrimaryContext;
             _renderLoop = renderLoop;
-            _batchObjectPool = batchObjectPool;
-            _batchMemoryPool = batchMemoryPool;
+            BatchObjectPool = batchObjectPool;
+            BatchMemoryPool = batchMemoryPool;
             _renderLoop.Add(this);
         }
 
@@ -60,7 +60,7 @@ namespace Avalonia.Rendering.Composition.Server
                     batch = _batches.Dequeue();
                 }
 
-                using (var stream = new BatchStreamReader(batch.Changes, _batchMemoryPool, _batchObjectPool))
+                using (var stream = new BatchStreamReader(batch.Changes, BatchMemoryPool, BatchObjectPool))
                 {
                     while (!stream.IsObjectEof)
                     {

src/Avalonia.Base/Rendering/Composition/Transport/BatchStreamArrayPool.cs

@@ -18,6 +18,9 @@ internal abstract class BatchStreamPoolBase<T> : IDisposable
     readonly int[] _usageStatistics = new int[10];
     int _usageStatisticsSlot;
 
+    public int CurrentUsage => _usage;
+    public int CurrentPool => _pool.Count;
+
     public BatchStreamPoolBase(bool needsFinalize, Action<Func<bool>>? startTimer = null)
     {
         if(!needsFinalize)
@@ -116,16 +119,16 @@ internal abstract class BatchStreamPoolBase<T> : IDisposable
 
 internal sealed class BatchStreamObjectPool<T> : BatchStreamPoolBase<T[]> where T : class?
 {
-    private readonly int _arraySize;
+    public int ArraySize { get; }
 
-    public BatchStreamObjectPool(int arraySize = 1024, Action<Func<bool>>? startTimer = null) : base(false, startTimer)
+    public BatchStreamObjectPool(int arraySize = 128, Action<Func<bool>>? startTimer = null) : base(false, startTimer)
     {
-        _arraySize = arraySize;
+        ArraySize = arraySize;
     }
     
     protected override T[] CreateItem()
     {
-        return new T[_arraySize];
+        return new T[ArraySize];
     }
 
     protected override void DestroyItem(T[] item)

src/Avalonia.Dialogs/ByteSizeHelper.cs → src/Avalonia.Base/Utilities/ByteSizeHelper.cs

@@ -1,10 +1,11 @@
 using System;
 
-namespace Avalonia.Dialogs
+namespace Avalonia.Utilities
 {
     internal static class ByteSizeHelper
     {
-        private const string formatTemplate = "{0}{1:0.#} {2}";
+        private const string formatTemplateSeparated = "{0}{1:0.#} {2}";
+        private const string formatTemplate = "{0}{1:0.#}{2}";
 
         private static readonly string[] Prefixes =
         {
@@ -19,11 +20,11 @@ namespace Avalonia.Dialogs
             "YB" 
         };
 
-        public static string ToString(ulong bytes)
+        public static string ToString(ulong bytes, bool separate)
         {
             if (bytes == 0)
             {
-                return string.Format(formatTemplate, null, 0, Prefixes[0]);
+                return string.Format(separate ? formatTemplateSeparated : formatTemplate, null, 0, Prefixes[0]);
             }
 
             var absSize = Math.Abs((double)bytes);

src/Avalonia.Dialogs/FileSizeStringConverter.cs

@@ -12,7 +12,7 @@ namespace Avalonia.Dialogs
         {
             if (value is long size && size > 0)
             {
-                return ByteSizeHelper.ToString((ulong)size);
+                return Avalonia.Utilities.ByteSizeHelper.ToString((ulong)size, true);
             }
 
             return "";

src/Avalonia.Dialogs/ManagedFileChooserSources.cs

@@ -6,6 +6,7 @@ using System.Reactive.Linq;
 using System.Runtime.InteropServices;
 using Avalonia.Controls.Platform;
 using Avalonia.Threading;
+using Avalonia.Utilities;
 
 namespace Avalonia.Dialogs
 {
@@ -60,7 +61,7 @@ namespace Avalonia.Dialogs
 
                        if (displayName == null & x.VolumeSizeBytes > 0)
                        {
-                           displayName = $"{ByteSizeHelper.ToString(x.VolumeSizeBytes)} Volume";
+                           displayName = $"{ByteSizeHelper.ToString(x.VolumeSizeBytes, true)} Volume";
                        };
 
                        try