perf(fill): short-circuit default comparisons by count
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@@ -0,0 +1,157 @@
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using System.Diagnostics;
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using System.Runtime.InteropServices;
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using OpenNest.Engine.Fill;
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using OpenNest.Geometry;
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using OpenNest.Shapes;
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using OpenNest.Tests.BestFit;
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using Xunit.Abstractions;
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namespace OpenNest.Tests.Fill;
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[Collection(nameof(FillCacheCollection))]
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[Trait("Category", "FillPerformance")]
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public class FillPerformanceTests
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{
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private readonly ITestOutputHelper output;
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public FillPerformanceTests(ITestOutputHelper output) => this.output = output;
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[SkippableFact]
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public void DefaultComparer_ReportsUnequalCountsAndEqualCountControl()
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{
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// Xunit.SkippableFact 1.4.13 calls its skip-unless API IfNot.
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Skip.IfNot(Environment.GetEnvironmentVariable("OPENNEST_RUN_FILL_PERF") == "1",
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"Set OPENNEST_RUN_FILL_PERF=1 to run opt-in fill microbenchmarks.");
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var workArea = new Box(0, 0, 256, 256);
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var drawing = new RectangleShape { Length = 2, Width = 1 }.GetDrawing();
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var larger = MakeGrid(drawing, 2048, 4);
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var smaller = MakeGrid(drawing, 2047, 3);
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var equalCountCompact = MakeGrid(drawing, 2048, 3);
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AssertValidRectangles(larger, workArea);
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AssertValidRectangles(smaller, workArea);
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AssertValidRectangles(equalCountCompact, workArea);
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Assert.True(FillScore.Compute(smaller, workArea).Density > FillScore.Compute(larger, workArea).Density);
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#if DEBUG
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output.WriteLine("Configuration=Debug (diagnostic only; use Release for measurements).");
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#else
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output.WriteLine("Configuration=Release.");
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#endif
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output.WriteLine($"Runtime={RuntimeInformation.FrameworkDescription}; OS={RuntimeInformation.OSDescription}; "
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+ $"architecture={RuntimeInformation.ProcessArchitecture}; processors={Environment.ProcessorCount}; "
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+ $"Stopwatch.Frequency={Stopwatch.Frequency} ticks/s.");
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output.WriteLine("Synthetic 2x1 rectangles, 64 columns, work area=(0,0,256,256). "
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+ "Larger: 2048 parts, pitch=4; smaller: 2047 parts, pitch=3; equal-count compact: 2048 parts, pitch=3.");
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output.WriteLine("Each batch alternates argument order (half forward, half reverse). "
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+ "Actual/reference batch order alternates between repetitions. "
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+ "Construction, validation, assertions and output excluded; delegate/loop/result-consumption overhead included. "
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+ "Allocations use GC.GetAllocatedBytesForCurrentThread around synchronous calls only. "
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+ "These are local microbenchmarks, not timing gates or whole-job speedup estimates.");
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// A large fixed batch also makes the optimized, constant-time path measurable.
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// Keep these inputs and iteration counts identical for before/after measurements.
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ReportCase("unequal-counts", larger, smaller, workArea, 500_000);
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ReportCase("equal-count-control", equalCountCompact, larger, workArea, 10_000);
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}
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private void ReportCase(string name, List<Part> candidate, List<Part> current, Box workArea, int callsPerBatch)
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{
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var comparer = new DefaultFillComparer();
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var actual = new Func<List<Part>, List<Part>, Box, bool>(comparer.IsBetter);
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var reference = new Func<List<Part>, List<Part>, Box, bool>((a, b, area) =>
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FillScore.Compute(a, area) > FillScore.Compute(b, area));
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var expectedForward = reference(candidate, current, workArea);
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var expectedReverse = reference(current, candidate, workArea);
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Assert.Equal(expectedForward, actual(candidate, current, workArea));
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Assert.Equal(expectedReverse, actual(current, candidate, workArea));
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var expectedTrueCount = callsPerBatch / 2 * ((expectedForward ? 1 : 0) + (expectedReverse ? 1 : 0));
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var warmupCallsPerBatch = 50_000;
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var repetitions = 7;
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// Interleaved warmup allows JIT/tiering and cached drawing/bounds access to settle.
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for (var i = 0; i < 2; i++)
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{
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Measure(actual, candidate, current, workArea, warmupCallsPerBatch);
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Measure(reference, candidate, current, workArea, warmupCallsPerBatch);
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}
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output.WriteLine($"{name}: warmup=2 batches x {warmupCallsPerBatch} calls per implementation; "
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+ $"measured={repetitions} batches x {callsPerBatch} calls per implementation; "
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+ $"expected true results/batch={expectedTrueCount}.");
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var actualSamples = new Sample[repetitions];
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var referenceSamples = new Sample[repetitions];
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for (var i = 0; i < repetitions; i++)
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{
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if (i % 2 == 0)
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{
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actualSamples[i] = Measure(actual, candidate, current, workArea, callsPerBatch);
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referenceSamples[i] = Measure(reference, candidate, current, workArea, callsPerBatch);
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}
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else
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{
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referenceSamples[i] = Measure(reference, candidate, current, workArea, callsPerBatch);
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actualSamples[i] = Measure(actual, candidate, current, workArea, callsPerBatch);
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}
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// Consume measured results and check correctness outside the timed region.
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Assert.Equal(expectedTrueCount, actualSamples[i].TrueCount);
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Assert.Equal(expectedTrueCount, referenceSamples[i].TrueCount);
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output.WriteLine(FormattableString.Invariant(
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$"{name} batch {i + 1}: actual={actualSamples[i].Milliseconds:F6} ms, {actualSamples[i].AllocatedBytes} B; reference={referenceSamples[i].Milliseconds:F6} ms, {referenceSamples[i].AllocatedBytes} B."));
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}
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ReportSummary(name, "actual", actualSamples, callsPerBatch);
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ReportSummary(name, "reference", referenceSamples, callsPerBatch);
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}
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private void ReportSummary(string name, string implementation, Sample[] samples, int callsPerBatch)
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{
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var times = samples.Select(s => s.Milliseconds).OrderBy(t => t).ToArray();
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var bytes = samples.Select(s => s.AllocatedBytes).OrderBy(b => b).ToArray();
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var median = samples.Length / 2;
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output.WriteLine(FormattableString.Invariant(
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$"{name} {implementation}: batch ms min/median/max={times[0]:F6}/{times[median]:F6}/{times[^1]:F6}; ns/call min/median/max={times[0] * 1_000_000 / callsPerBatch:F3}/{times[median] * 1_000_000 / callsPerBatch:F3}/{times[^1] * 1_000_000 / callsPerBatch:F3}; batch bytes min/median/max={bytes[0]}/{bytes[median]}/{bytes[^1]}; B/call min/median/max={(double)bytes[0] / callsPerBatch:F6}/{(double)bytes[median] / callsPerBatch:F6}/{(double)bytes[^1] / callsPerBatch:F6}."));
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}
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private static Sample Measure(Func<List<Part>, List<Part>, Box, bool> compare,
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List<Part> candidate, List<Part> current, Box workArea, int calls)
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{
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var trueCount = 0;
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var allocatedBefore = GC.GetAllocatedBytesForCurrentThread();
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var start = Stopwatch.GetTimestamp();
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for (var i = 0; i < calls; i++)
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{
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var forward = i % 2 == 0;
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if (compare(forward ? candidate : current, forward ? current : candidate, workArea))
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trueCount++;
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}
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var elapsed = Stopwatch.GetTimestamp() - start;
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var allocated = GC.GetAllocatedBytesForCurrentThread() - allocatedBefore;
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return new Sample(elapsed * 1000.0 / Stopwatch.Frequency, allocated, trueCount);
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}
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private static List<Part> MakeGrid(Drawing drawing, int count, double pitch)
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{
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var parts = new List<Part>(count);
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for (var i = 0; i < count; i++)
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parts.Add(new Part(drawing, new Vector(i % 64 * pitch, i / 64 * pitch)));
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return parts;
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}
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private static void AssertValidRectangles(List<Part> parts, Box workArea)
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{
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for (var i = 0; i < parts.Count; i++)
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{
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var part = parts[i];
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Assert.Equal(2.0, part.BaseDrawing.Area);
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Assert.Equal(2.0, part.BoundingBox.Length);
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Assert.Equal(1.0, part.BoundingBox.Width);
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Assert.True(workArea.Contains(part.BoundingBox));
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foreach (var value in new[] { part.Left, part.Right, part.Bottom, part.Top, part.Rotation })
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Assert.True(double.IsFinite(value));
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for (var j = 0; j < i; j++)
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Assert.False(part.BoundingBox.Intersects(parts[j].BoundingBox));
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}
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}
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private readonly record struct Sample(double Milliseconds, long AllocatedBytes, int TrueCount);
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}
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