62 lines
1.9 KiB
C#
62 lines
1.9 KiB
C#
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// TimeSample from Mirror II.
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// simple profiling sample, averaged for display in statistics.
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// usable in builds without unitiy profiler overhead etc.
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//
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// .average may safely be called from main thread while Begin/End is in another.
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// i.e. worker threads, transport, etc.
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using System.Diagnostics;
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using System.Threading;
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namespace Mirror
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{
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public struct TimeSample
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{
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// UnityEngine.Time isn't thread safe. use stopwatch instead.
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readonly Stopwatch watch;
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// remember when Begin was called
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double beginTime;
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// keep accumulating times over the given interval.
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// (not readonly. we modify its contents.)
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ExponentialMovingAverage ema;
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// average in seconds.
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// code often runs in sub-millisecond time. float is more precise.
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//
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// set with Interlocked for thread safety.
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// can be read from main thread while sampling happens in other thread.
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public double average; // THREAD SAFE
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// average over N begin/end captures
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public TimeSample(int n)
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{
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watch = new Stopwatch();
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watch.Start();
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ema = new ExponentialMovingAverage(n);
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beginTime = 0;
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average = 0;
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}
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// begin is called before the code to be sampled
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public void Begin()
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{
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// remember when Begin was called.
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// keep StopWatch running so we can average over the given interval.
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beginTime = watch.Elapsed.TotalSeconds;
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// Debug.Log($"Begin @ {beginTime:F4}");
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}
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// end is called after the code to be sampled
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public void End()
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{
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// add duration in seconds to accumulated durations
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double elapsed = watch.Elapsed.TotalSeconds - beginTime;
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ema.Add(elapsed);
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// expose new average thread safely
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Interlocked.Exchange(ref average, ema.Value);
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}
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}
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}
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