723 lines
23 KiB
C#
723 lines
23 KiB
C#
using System.Collections.Concurrent;
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using System.Diagnostics;
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namespace Nerfed.Runtime;
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public struct ProfilerScope : IDisposable
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{
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public ProfilerScope(string label)
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{
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Profiler.BeginSample(label);
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}
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public ProfilerScope(string label, string category, ulong tagMask = 0)
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{
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Profiler.BeginSample(label, category, tagMask);
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}
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public void Dispose()
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{
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Profiler.EndSample();
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}
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}
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public static class Profiler
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{
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public enum CaptureMode
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{
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Instrumented = 0,
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SampledInstrumentation = 1,
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}
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private sealed class ThreadProfilerState
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{
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public readonly Stack<ScopeNode> Scopes = new Stack<ScopeNode>();
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public readonly Stack<bool> CaptureDecisions = new Stack<bool>();
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public int SampleCursor;
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public int ThreadId;
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}
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public readonly struct LabelMetrics
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{
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public LabelMetrics(double inclusiveMs, double selfMs, uint calls, double minInclusiveMs, double maxInclusiveMs)
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{
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InclusiveMs = inclusiveMs;
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SelfMs = selfMs;
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Calls = calls;
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MinInclusiveMs = minInclusiveMs;
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MaxInclusiveMs = maxInclusiveMs;
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}
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public double InclusiveMs { get; }
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public double SelfMs { get; }
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public uint Calls { get; }
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public double MinInclusiveMs { get; }
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public double MaxInclusiveMs { get; }
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}
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public readonly struct RollingLabelMetrics
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{
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public RollingLabelMetrics(double averageMs, double minMs, double maxMs, double p95Ms, int samples)
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{
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AverageMs = averageMs;
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MinMs = minMs;
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MaxMs = maxMs;
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P95Ms = p95Ms;
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Samples = samples;
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}
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public double AverageMs { get; }
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public double MinMs { get; }
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public double MaxMs { get; }
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public double P95Ms { get; }
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public int Samples { get; }
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}
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public readonly struct ThreadMetrics
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{
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public ThreadMetrics(double inclusiveMs, double selfMs, uint calls, bool overBudget)
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{
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InclusiveMs = inclusiveMs;
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SelfMs = selfMs;
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Calls = calls;
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OverBudget = overBudget;
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}
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public double InclusiveMs { get; }
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public double SelfMs { get; }
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public uint Calls { get; }
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public bool OverBudget { get; }
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}
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public readonly struct RollingThreadMetrics
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{
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public RollingThreadMetrics(double averageMs, double p95Ms, double maxMs, int samples, int budgetMisses)
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{
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AverageMs = averageMs;
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P95Ms = p95Ms;
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MaxMs = maxMs;
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Samples = samples;
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BudgetMisses = budgetMisses;
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}
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public double AverageMs { get; }
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public double P95Ms { get; }
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public double MaxMs { get; }
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public int Samples { get; }
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public int BudgetMisses { get; }
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}
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private sealed class RollingWindow
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{
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private readonly double[] values;
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private int index;
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private int count;
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public RollingWindow(int capacity)
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{
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values = new double[Math.Max(8, capacity)];
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}
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public void Add(double value)
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{
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values[index] = value;
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index = (index + 1) % values.Length;
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if (count < values.Length)
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{
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count++;
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}
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}
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public RollingLabelMetrics Snapshot()
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{
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if (count == 0)
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{
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return default;
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}
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double sum = 0;
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double min = double.MaxValue;
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double max = double.MinValue;
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double[] sorted = new double[count];
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int start = (index - count + values.Length) % values.Length;
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for (int i = 0; i < count; i++)
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{
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double value = values[(start + i) % values.Length];
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sorted[i] = value;
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sum += value;
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min = Math.Min(min, value);
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max = Math.Max(max, value);
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}
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Array.Sort(sorted);
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int percentileIndex = (int)Math.Ceiling((count - 1) * 0.95d);
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double p95 = sorted[Math.Clamp(percentileIndex, 0, count - 1)];
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return new RollingLabelMetrics(sum / count, min, max, p95, count);
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}
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}
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private sealed class RollingThreadWindow
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{
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private readonly double[] durations;
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private readonly byte[] misses;
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private int index;
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private int count;
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public RollingThreadWindow(int capacity)
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{
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int size = Math.Max(8, capacity);
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durations = new double[size];
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misses = new byte[size];
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}
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public void Add(double durationMs, bool budgetMiss)
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{
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durations[index] = durationMs;
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misses[index] = budgetMiss ? (byte)1 : (byte)0;
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index = (index + 1) % durations.Length;
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if (count < durations.Length)
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{
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count++;
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}
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}
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public RollingThreadMetrics Snapshot()
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{
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if (count == 0)
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{
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return default;
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}
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double sum = 0;
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double max = double.MinValue;
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int budgetMisses = 0;
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double[] sorted = new double[count];
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int start = (index - count + durations.Length) % durations.Length;
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for (int i = 0; i < count; i++)
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{
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int at = (start + i) % durations.Length;
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double value = durations[at];
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sum += value;
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max = Math.Max(max, value);
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budgetMisses += misses[at];
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sorted[i] = value;
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}
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Array.Sort(sorted);
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int percentileIndex = (int)Math.Ceiling((count - 1) * 0.95d);
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double p95 = sorted[Math.Clamp(percentileIndex, 0, count - 1)];
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return new RollingThreadMetrics(sum / count, p95, max, count, budgetMisses);
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}
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}
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public class Frame(uint frameCount)
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{
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public uint FrameCount { get; } = frameCount;
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public long StartTime { get; } = Stopwatch.GetTimestamp();
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public long EndTime { get; private set; }
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private readonly List<ScopeNode> rootNodes = new List<ScopeNode>(8);
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private readonly object rootNodesLock = new object();
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private readonly Dictionary<string, LabelMetrics> labelMetrics = new Dictionary<string, LabelMetrics>(128, StringComparer.Ordinal);
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private readonly Dictionary<string, LabelMetrics> categoryMetrics = new Dictionary<string, LabelMetrics>(32, StringComparer.Ordinal);
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private readonly Dictionary<int, ThreadMetrics> threadMetrics = new Dictionary<int, ThreadMetrics>(16);
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public IReadOnlyList<ScopeNode> RootNodes => rootNodes;
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public IReadOnlyDictionary<string, LabelMetrics> LabelMetrics => labelMetrics;
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public IReadOnlyDictionary<string, LabelMetrics> CategoryMetrics => categoryMetrics;
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public IReadOnlyDictionary<int, ThreadMetrics> ThreadMetrics => threadMetrics;
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public long AllocatedBytesStart { get; } = GC.GetTotalAllocatedBytes(false);
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public long AllocatedBytesEnd { get; private set; }
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public long AllocatedBytesDelta { get; private set; }
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public int Gen0CollectionsStart { get; } = GC.CollectionCount(0);
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public int Gen1CollectionsStart { get; } = GC.CollectionCount(1);
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public int Gen2CollectionsStart { get; } = GC.CollectionCount(2);
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public int Gen0CollectionsEnd { get; private set; }
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public int Gen1CollectionsEnd { get; private set; }
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public int Gen2CollectionsEnd { get; private set; }
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public int Gen0CollectionsDelta { get; private set; }
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public int Gen1CollectionsDelta { get; private set; }
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public int Gen2CollectionsDelta { get; private set; }
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public bool OverBudget { get; private set; }
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public double BudgetMilliseconds { get; private set; }
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internal void AddRootNode(ScopeNode rootNode)
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{
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lock (rootNodesLock)
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{
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rootNodes.Add(rootNode);
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}
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}
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internal void End(double budgetMilliseconds)
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{
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EndTime = Stopwatch.GetTimestamp();
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BudgetMilliseconds = budgetMilliseconds;
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OverBudget = budgetMilliseconds > 0 && ElapsedMilliseconds() > budgetMilliseconds;
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AllocatedBytesEnd = GC.GetTotalAllocatedBytes(false);
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AllocatedBytesDelta = AllocatedBytesEnd - AllocatedBytesStart;
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Gen0CollectionsEnd = GC.CollectionCount(0);
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Gen1CollectionsEnd = GC.CollectionCount(1);
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Gen2CollectionsEnd = GC.CollectionCount(2);
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Gen0CollectionsDelta = Gen0CollectionsEnd - Gen0CollectionsStart;
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Gen1CollectionsDelta = Gen1CollectionsEnd - Gen1CollectionsStart;
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Gen2CollectionsDelta = Gen2CollectionsEnd - Gen2CollectionsStart;
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BuildLabelMetrics();
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}
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public double ElapsedMilliseconds()
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{
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long elapsedTicks = EndTime - StartTime;
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return ((double)(elapsedTicks * 1000)) / Stopwatch.Frequency;
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}
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private void BuildLabelMetrics()
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{
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labelMetrics.Clear();
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categoryMetrics.Clear();
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threadMetrics.Clear();
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lock (rootNodesLock)
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{
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for (int i = 0; i < rootNodes.Count; i++)
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{
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AccumulateLabelMetrics(rootNodes[i]);
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}
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foreach (ScopeNode rootNode in rootNodes)
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{
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for (int i = 0; i < rootNode.Children.Count; i++)
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{
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AccumulateThreadMetrics(rootNode.ManagedThreadId, rootNode.Children[i]);
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}
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}
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}
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ApplyThreadBudgetFlags();
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}
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private void AccumulateLabelMetrics(ScopeNode node)
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{
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double inclusiveMs = node.ElapsedMilliseconds();
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double selfMs = node.SelfMilliseconds();
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if (labelMetrics.TryGetValue(node.Label, out LabelMetrics current))
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{
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labelMetrics[node.Label] = new LabelMetrics(
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current.InclusiveMs + inclusiveMs,
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current.SelfMs + selfMs,
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current.Calls + 1,
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Math.Min(current.MinInclusiveMs, inclusiveMs),
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Math.Max(current.MaxInclusiveMs, inclusiveMs));
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}
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else
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{
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labelMetrics[node.Label] = new LabelMetrics(inclusiveMs, selfMs, 1, inclusiveMs, inclusiveMs);
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}
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if (categoryMetrics.TryGetValue(node.Category, out LabelMetrics categoryCurrent))
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{
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categoryMetrics[node.Category] = new LabelMetrics(
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categoryCurrent.InclusiveMs + inclusiveMs,
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categoryCurrent.SelfMs + selfMs,
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categoryCurrent.Calls + 1,
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Math.Min(categoryCurrent.MinInclusiveMs, inclusiveMs),
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Math.Max(categoryCurrent.MaxInclusiveMs, inclusiveMs));
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}
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else
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{
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categoryMetrics[node.Category] = new LabelMetrics(inclusiveMs, selfMs, 1, inclusiveMs, inclusiveMs);
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}
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for (int i = 0; i < node.Children.Count; i++)
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{
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AccumulateLabelMetrics(node.Children[i]);
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}
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}
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private void AccumulateThreadMetrics(int threadId, ScopeNode node)
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{
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double inclusiveMs = node.ElapsedMilliseconds();
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double selfMs = node.SelfMilliseconds();
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if (threadMetrics.TryGetValue(threadId, out ThreadMetrics current))
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{
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threadMetrics[threadId] = new ThreadMetrics(current.InclusiveMs + inclusiveMs, current.SelfMs + selfMs, current.Calls + 1, false);
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}
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else
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{
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threadMetrics[threadId] = new ThreadMetrics(inclusiveMs, selfMs, 1, false);
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}
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for (int i = 0; i < node.Children.Count; i++)
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{
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AccumulateThreadMetrics(threadId, node.Children[i]);
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}
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}
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private void ApplyThreadBudgetFlags()
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{
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double perThreadBudget = Math.Max(0d, ThreadBudgetMilliseconds);
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if (perThreadBudget <= 0d)
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{
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return;
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}
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int[] keys = threadMetrics.Keys.ToArray();
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for (int i = 0; i < keys.Length; i++)
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{
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int key = keys[i];
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ThreadMetrics metric = threadMetrics[key];
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threadMetrics[key] = new ThreadMetrics(metric.InclusiveMs, metric.SelfMs, metric.Calls, metric.InclusiveMs > perThreadBudget);
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}
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}
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}
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public class ScopeNode
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{
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public string Label { get; private set; } = string.Empty;
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public string Category { get; private set; } = DefaultCategory;
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public ulong TagMask { get; private set; }
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public long StartTime { get; private set; }
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public long EndTime { get; private set; }
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public int ManagedThreadId { get; private set; }
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public List<ScopeNode> Children { get; } = new List<ScopeNode>();
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internal ScopeNode Parent { get; private set; }
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internal long ChildrenDurationTicks { get; private set; }
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internal void Reset(string label, string category, ulong tagMask, int managedThreadId, ScopeNode parent)
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{
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Label = label;
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Category = string.IsNullOrWhiteSpace(category) ? DefaultCategory : category;
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TagMask = tagMask;
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ManagedThreadId = managedThreadId;
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Parent = parent;
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StartTime = Stopwatch.GetTimestamp();
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EndTime = 0;
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ChildrenDurationTicks = 0;
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Children.Clear();
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}
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internal void End()
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{
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if (EndTime != 0)
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{
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return;
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}
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EndTime = Stopwatch.GetTimestamp();
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if (Parent != null)
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{
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Parent.ChildrenDurationTicks += Math.Max(0, EndTime - StartTime);
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}
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}
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public double ElapsedMilliseconds()
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{
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return ((double)(Math.Max(0, EndTime - StartTime))) * 1000 / Stopwatch.Frequency;
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}
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public double SelfMilliseconds()
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{
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long elapsedTicks = Math.Max(0, EndTime - StartTime);
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long selfTicks = Math.Max(0, elapsedTicks - ChildrenDurationTicks);
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return ((double)selfTicks) * 1000 / Stopwatch.Frequency;
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}
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// Add a child node (used for nested scopes)
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internal ScopeNode AddChild(string label, string category, ulong tagMask)
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{
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ScopeNode child = RentNode(label, category, tagMask, ManagedThreadId, this);
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Children.Add(child);
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return child;
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}
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}
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private const int maxFrames = 128;
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private const int rollingWindowSize = 240;
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private const string DefaultCategory = "General";
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public static bool IsRecording { get; private set; } = true;
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public static double FrameBudgetMilliseconds { get; set; } = 16.667;
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public static double ThreadBudgetMilliseconds { get; set; } = 8.333;
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public static CaptureMode Mode { get; set; } = CaptureMode.Instrumented;
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public static int SamplingStride { get; set; } = 8;
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// Store only the last x amount of frames in memory.
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public static readonly BoundedQueue<Frame> Frames = new(maxFrames);
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// Use ThreadLocal to store a stack of ScopeNodes per thread and enable tracking of thread-local values.
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private static readonly ThreadLocal<ThreadProfilerState> threadStates = new ThreadLocal<ThreadProfilerState>(() => new ThreadProfilerState(), true);
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private static readonly ConcurrentDictionary<int, string> threadRootLabelCache = new ConcurrentDictionary<int, string>();
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private static readonly ConcurrentBag<ScopeNode> nodePool = new ConcurrentBag<ScopeNode>();
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private static readonly Dictionary<string, RollingWindow> rollingWindows = new Dictionary<string, RollingWindow>(256, StringComparer.Ordinal);
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private static readonly Dictionary<int, RollingThreadWindow> rollingThreadWindows = new Dictionary<int, RollingThreadWindow>(16);
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private static readonly object rollingWindowsLock = new object();
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private static Frame currentFrame = null;
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private static uint frameCount = 0;
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public static void SetActive(bool isRecording)
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{
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if (IsRecording && !isRecording)
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{
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FinalizeCurrentFrame();
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}
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IsRecording = isRecording;
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}
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public static int CopyFramesTo(List<Frame> destination)
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{
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destination.Clear();
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foreach (Frame frame in Frames)
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{
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destination.Add(frame);
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}
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return destination.Count;
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}
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public static IReadOnlyDictionary<string, RollingLabelMetrics> GetRollingLabelMetricsSnapshot()
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{
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lock (rollingWindowsLock)
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{
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Dictionary<string, RollingLabelMetrics> snapshot = new Dictionary<string, RollingLabelMetrics>(rollingWindows.Count, StringComparer.Ordinal);
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foreach (KeyValuePair<string, RollingWindow> pair in rollingWindows)
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{
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snapshot[pair.Key] = pair.Value.Snapshot();
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}
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return snapshot;
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}
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}
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public static IReadOnlyDictionary<int, RollingThreadMetrics> GetRollingThreadMetricsSnapshot()
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{
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lock (rollingWindowsLock)
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{
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Dictionary<int, RollingThreadMetrics> snapshot = new Dictionary<int, RollingThreadMetrics>(rollingThreadWindows.Count);
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foreach (KeyValuePair<int, RollingThreadWindow> pair in rollingThreadWindows)
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{
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snapshot[pair.Key] = pair.Value.Snapshot();
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}
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return snapshot;
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}
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}
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[Conditional("PROFILING")]
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public static void BeginFrame()
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{
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if (!IsRecording)
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{
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return;
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}
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if (currentFrame != null)
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{
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FinalizeCurrentFrame();
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}
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currentFrame = new Frame(frameCount);
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}
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[Conditional("PROFILING")]
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public static void EndFrame()
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{
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if (!IsRecording)
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{
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return;
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}
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FinalizeCurrentFrame();
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}
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[Conditional("PROFILING")]
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public static void BeginSample(string label)
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{
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BeginSample(label, DefaultCategory, 0);
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}
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[Conditional("PROFILING")]
|
|
public static void BeginSample(string label, string category, ulong tagMask = 0)
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{
|
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if (!IsRecording || currentFrame == null)
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{
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return;
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}
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ThreadProfilerState state = threadStates.Value;
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state.ThreadId = Environment.CurrentManagedThreadId;
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bool parentCaptured = state.CaptureDecisions.Count > 0 && state.CaptureDecisions.Peek();
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|
bool capture = parentCaptured || Mode == CaptureMode.Instrumented || ShouldSample(state);
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state.CaptureDecisions.Push(capture);
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|
|
|
if (!capture)
|
|
{
|
|
return;
|
|
}
|
|
|
|
Stack<ScopeNode> scopes = state.Scopes;
|
|
Frame frame = currentFrame;
|
|
if (frame == null)
|
|
{
|
|
state.CaptureDecisions.Pop();
|
|
return;
|
|
}
|
|
|
|
if (scopes.Count == 0)
|
|
{
|
|
// First scope for this thread (new root for this thread)
|
|
int threadId = state.ThreadId;
|
|
ScopeNode rootScopeNode = RentNode(GetThreadRootLabel(threadId), DefaultCategory, 0, threadId, null);
|
|
scopes.Push(rootScopeNode);
|
|
frame.AddRootNode(rootScopeNode);
|
|
}
|
|
|
|
// Create a new child under the current top of the stack
|
|
ScopeNode newScope = scopes.Peek().AddChild(label, category, tagMask);
|
|
|
|
scopes.Push(newScope); // Push new scope to the thread's stack
|
|
}
|
|
|
|
[Conditional("PROFILING")]
|
|
public static void EndSample()
|
|
{
|
|
if (!IsRecording || currentFrame == null)
|
|
{
|
|
return;
|
|
}
|
|
|
|
ThreadProfilerState state = threadStates.Value;
|
|
if (state.CaptureDecisions.Count == 0)
|
|
{
|
|
return;
|
|
}
|
|
|
|
bool captured = state.CaptureDecisions.Pop();
|
|
if (!captured)
|
|
{
|
|
return;
|
|
}
|
|
|
|
Stack<ScopeNode> scopes = state.Scopes;
|
|
|
|
if (scopes.Count > 1)
|
|
{
|
|
ScopeNode currentScope = scopes.Pop();
|
|
currentScope.End();
|
|
}
|
|
}
|
|
|
|
private static bool ShouldSample(ThreadProfilerState state)
|
|
{
|
|
int stride = Math.Max(1, SamplingStride);
|
|
state.SampleCursor++;
|
|
return state.SampleCursor % stride == 0;
|
|
}
|
|
|
|
private static string GetThreadRootLabel(int threadId)
|
|
{
|
|
return threadRootLabelCache.GetOrAdd(threadId, static id => $"Thread-{id}");
|
|
}
|
|
|
|
private static ScopeNode RentNode(string label, string category, ulong tagMask, int managedThreadId, ScopeNode parent)
|
|
{
|
|
if (!nodePool.TryTake(out ScopeNode node))
|
|
{
|
|
node = new ScopeNode();
|
|
}
|
|
|
|
node.Reset(label, category, tagMask, managedThreadId, parent);
|
|
return node;
|
|
}
|
|
|
|
private static void ReturnNodeTree(ScopeNode node)
|
|
{
|
|
for (int i = 0; i < node.Children.Count; i++)
|
|
{
|
|
ReturnNodeTree(node.Children[i]);
|
|
}
|
|
|
|
node.Reset(string.Empty, DefaultCategory, 0, 0, null);
|
|
nodePool.Add(node);
|
|
}
|
|
|
|
private static void FinalizeCurrentFrame()
|
|
{
|
|
Frame frame = currentFrame;
|
|
if (frame == null)
|
|
{
|
|
return;
|
|
}
|
|
|
|
foreach (ThreadProfilerState state in threadStates.Values)
|
|
{
|
|
Stack<ScopeNode> scopes = state.Scopes;
|
|
while (scopes.Count > 0)
|
|
{
|
|
ScopeNode currentScope = scopes.Pop();
|
|
currentScope.End();
|
|
}
|
|
|
|
scopes.Clear();
|
|
state.CaptureDecisions.Clear();
|
|
}
|
|
|
|
frame.End(FrameBudgetMilliseconds);
|
|
|
|
if (Frames.Enqueue(frame, out Frame evictedFrame))
|
|
{
|
|
for (int i = 0; i < evictedFrame.RootNodes.Count; i++)
|
|
{
|
|
ReturnNodeTree(evictedFrame.RootNodes[i]);
|
|
}
|
|
}
|
|
|
|
UpdateRollingWindows(frame);
|
|
UpdateRollingThreadWindows(frame);
|
|
frameCount++;
|
|
currentFrame = null;
|
|
}
|
|
|
|
private static void UpdateRollingWindows(Frame frame)
|
|
{
|
|
lock (rollingWindowsLock)
|
|
{
|
|
foreach (KeyValuePair<string, LabelMetrics> pair in frame.LabelMetrics)
|
|
{
|
|
if (!rollingWindows.TryGetValue(pair.Key, out RollingWindow window))
|
|
{
|
|
window = new RollingWindow(rollingWindowSize);
|
|
rollingWindows.Add(pair.Key, window);
|
|
}
|
|
|
|
window.Add(pair.Value.InclusiveMs);
|
|
}
|
|
}
|
|
}
|
|
|
|
private static void UpdateRollingThreadWindows(Frame frame)
|
|
{
|
|
lock (rollingWindowsLock)
|
|
{
|
|
foreach (KeyValuePair<int, ThreadMetrics> pair in frame.ThreadMetrics)
|
|
{
|
|
if (!rollingThreadWindows.TryGetValue(pair.Key, out RollingThreadWindow window))
|
|
{
|
|
window = new RollingThreadWindow(rollingWindowSize);
|
|
rollingThreadWindows.Add(pair.Key, window);
|
|
}
|
|
|
|
window.Add(pair.Value.InclusiveMs, pair.Value.OverBudget);
|
|
}
|
|
}
|
|
}
|
|
} |