37575dc41c
Side-by-side performance benchmarks using NATS.Client.Core against both servers on ephemeral ports. Includes core pub/sub, request/reply latency, and JetStream throughput tests with comparison output and benchmarks_comparison.md results. Also fixes timestamp flakiness in StoreInterfaceTests by using explicit timestamps.
52 lines
1.3 KiB
C#
52 lines
1.3 KiB
C#
using System.Diagnostics;
|
|
|
|
namespace NATS.Server.Benchmark.Tests.Harness;
|
|
|
|
/// <summary>
|
|
/// Pre-allocated latency recording buffer with percentile computation.
|
|
/// Records elapsed ticks from Stopwatch for each sample.
|
|
/// </summary>
|
|
public sealed class LatencyTracker
|
|
{
|
|
private readonly long[] _samples;
|
|
private int _count;
|
|
private bool _sorted;
|
|
|
|
public LatencyTracker(int capacity)
|
|
{
|
|
_samples = new long[capacity];
|
|
}
|
|
|
|
public void Record(long elapsedTicks)
|
|
{
|
|
if (_count < _samples.Length)
|
|
{
|
|
_samples[_count++] = elapsedTicks;
|
|
_sorted = false;
|
|
}
|
|
}
|
|
|
|
public LatencyPercentiles ComputePercentiles()
|
|
{
|
|
if (_count == 0)
|
|
return new LatencyPercentiles(0, 0, 0, 0, 0);
|
|
|
|
if (!_sorted)
|
|
{
|
|
Array.Sort(_samples, 0, _count);
|
|
_sorted = true;
|
|
}
|
|
|
|
var ticksPerUs = Stopwatch.Frequency / 1_000_000.0;
|
|
|
|
return new LatencyPercentiles(
|
|
P50Us: _samples[Percentile(50)] / ticksPerUs,
|
|
P95Us: _samples[Percentile(95)] / ticksPerUs,
|
|
P99Us: _samples[Percentile(99)] / ticksPerUs,
|
|
MinUs: _samples[0] / ticksPerUs,
|
|
MaxUs: _samples[_count - 1] / ticksPerUs);
|
|
}
|
|
|
|
private int Percentile(int p) => Math.Min((int)(_count * (p / 100.0)), _count - 1);
|
|
}
|