Javier Suárez
16 hours ago
committed by
GitHub
GitHub
5 changed files with 248 additions and 25 deletions
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#nullable enable |
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using System; |
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using System.Collections.Generic; |
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using System.Linq; |
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using System.Threading; |
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using BenchmarkDotNet.Attributes; |
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namespace Avalonia.Benchmarks.Rendering |
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{ |
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/// <summary>
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/// Benchmarks for Avalonia.Android hot path patterns.
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/// Run with: dotnet run -c Release -- --filter *AndroidRenderingBenchmarks*
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/// </summary>
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[MemoryDiagnoser] |
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public class AndroidRenderingBenchmarks |
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{ |
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private const int FrameCount = 1000; |
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// DispatchDraw: new Paint() every frame vs cached (TopLevelImpl.cs)
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[Benchmark] |
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public object? Current_DispatchDraw_NewObjectPerFrame() |
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{ |
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object? last = null; |
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for (int i = 0; i < FrameCount; i++) |
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{ |
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var obj = new DispatchDrawState(); |
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obj.Color = 0; |
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obj.Mode = 1; |
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last = obj; |
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} |
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return last; |
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} |
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[Benchmark] |
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public object? Optimized_DispatchDraw_CachedObject() |
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{ |
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DispatchDrawState? cached = null; |
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for (int i = 0; i < FrameCount; i++) |
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{ |
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if (cached == null) |
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{ |
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cached = new DispatchDrawState(); |
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cached.Color = 0; |
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cached.Mode = 1; |
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} |
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} |
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return cached; |
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} |
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private sealed class DispatchDrawState |
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{ |
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public int Color; |
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public int Mode; |
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} |
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// Dispatcher.Signal(): lock vs Interlocked (AndroidDispatcherImpl.cs)
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private readonly object _lock = new(); |
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[Benchmark] |
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public int Current_DispatcherSignal_Lock() |
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{ |
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int signaled = 0; |
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bool flag = false; |
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for (int i = 0; i < FrameCount; i++) |
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{ |
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lock (_lock) |
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{ |
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if (!flag) |
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{ |
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flag = true; |
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signaled++; |
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} |
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} |
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lock (_lock) |
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{ |
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flag = false; |
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} |
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} |
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return signaled; |
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} |
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[Benchmark] |
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public int Optimized_DispatcherSignal_Interlocked() |
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{ |
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int signaled = 0; |
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int flag = 0; |
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for (int i = 0; i < FrameCount; i++) |
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{ |
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if (Interlocked.CompareExchange(ref flag, 1, 0) == 0) |
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{ |
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signaled++; |
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} |
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Interlocked.Exchange(ref flag, 0); |
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} |
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return signaled; |
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} |
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// TextInput timestamp: DateTime.Now vs monotonic clock (TopLevelImpl.cs)
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[Benchmark] |
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public ulong Current_TextInput_DateTimeNowTicks() |
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{ |
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ulong result = 0; |
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for (int i = 0; i < FrameCount; i++) |
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{ |
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result = (ulong)DateTime.Now.Ticks; |
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} |
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return result; |
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} |
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[Benchmark] |
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public long Optimized_TextInput_StopwatchTimestamp() |
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{ |
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long result = 0; |
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for (int i = 0; i < FrameCount; i++) |
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{ |
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result = System.Diagnostics.Stopwatch.GetTimestamp(); |
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} |
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return result; |
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} |
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// Accessibility action: LINQ vs loop (AvaloniaAccessHelper.cs)
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private readonly List<int> _providers = new() { 1, 2, 3 }; |
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[Benchmark] |
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public bool Current_AccessAction_Linq() |
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{ |
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bool result = false; |
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for (int i = 0; i < FrameCount; i++) |
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{ |
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result = _providers |
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.Select(x => x > 1) |
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.Aggregate(false, (a, b) => a | b); |
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} |
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return result; |
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} |
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[Benchmark] |
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public bool Optimized_AccessAction_Loop() |
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{ |
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bool result = false; |
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for (int i = 0; i < FrameCount; i++) |
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{ |
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foreach (var p in _providers) |
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{ |
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result |= p > 1; |
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} |
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} |
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return result; |
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} |
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// Keyboard char.ToString() vs cached string (AndroidKeyboardEventsHelper.cs)
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private static readonly string[] s_asciiStringCache = CreateAsciiCache(); |
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private static string[] CreateAsciiCache() |
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{ |
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var cache = new string[128]; |
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for (int i = 0; i < 128; i++) |
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{ |
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cache[i] = ((char)i).ToString(); |
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} |
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return cache; |
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} |
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[Benchmark] |
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public string? Current_KeySymbol_CharToString() |
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{ |
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string? last = null; |
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for (int i = 0; i < FrameCount; i++) |
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{ |
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char c = (char)(32 + (i % 95)); |
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last = c.ToString(); |
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} |
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return last; |
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} |
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[Benchmark] |
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public string? Optimized_KeySymbol_CachedString() |
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{ |
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string? last = null; |
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for (int i = 0; i < FrameCount; i++) |
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{ |
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int code = 32 + (i % 95); |
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last = s_asciiStringCache[code]; |
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} |
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return last; |
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} |
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} |
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} |
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