public void Should_RefreshEntireHistogramAfterRefreshInterval()
{
var target = new HdrHistogramReservoir(1, 30000, 3, 1000);
Parallel.ForEach(Enumerable.Range(1, 100), i => target.Update(i));
AssertEmptySnapshot(target.GetSnapshot(false));
AssertEmptySnapshot(target.GetSnapshot(false));
TestHelper.RetryAssert(
() =>
{
AssertFirstSnapshot(target.GetSnapshot(false));
},
200,
15);
Parallel.ForEach(Enumerable.Range(201, 100), i => target.Update(i));
AssertFirstSnapshot(target.GetSnapshot(false));
AssertFirstSnapshot(target.GetSnapshot(false));
TestHelper.RetryAssert(
() =>
{
AssertSecondSnapshot(target.GetSnapshot(false));
},
200,
15);
AssertSecondSnapshot(target.GetSnapshot(false));
AssertSecondSnapshot(target.GetSnapshot(false));
}
public async Task Should_ReturnEmptyHistogram_When_ResetIsCalled()
{
var target = new HdrHistogramReservoir(1, 1000000000000, 3, 2000);
var tcs = new CancellationTokenSource();
AssertEmptySnapshot(target.GetSnapshot(false));
Parallel.ForEach(Enumerable.Range(1, 100), i => target.Update(i));
AssertEmptySnapshot(target.GetSnapshot(false));
await Task.Yield();
AssertEmptySnapshot(target.GetSnapshot(false));
TestHelper.RetryAssert(
() =>
{
AssertFirstSnapshot(target.GetSnapshot(false));
},
200,
20);
var tasks = Enumerable.Range(0, 4).Select(i => Task.Run(async() =>
{
var current = i * 100000;
while (!tcs.IsCancellationRequested)
{
if (current == int.MaxValue)
{
current = 0;
}
target.Update(++current);
await Task.Yield();
}
})).ToList();
try
{
AssertFirstSnapshot(target.GetSnapshot(false));
await Task.Yield();
AssertFirstSnapshot(target.GetSnapshot(false));
// reset
AssertFirstSnapshot(target.GetSnapshot(true));
AssertEmptySnapshot(target.GetSnapshot(false));
await Task.Yield();
AssertEmptySnapshot(target.GetSnapshot(false));
}
finally
{
tcs.Cancel();
await Task.WhenAll(tasks).ConfigureAwait(false);
}
}
public void Should_EmptySnapshotBeThreadSafe()
{
var target = new HdrHistogramReservoir(1, 1000, 3, 10000);
Parallel.ForEach(Enumerable.Range(1, 100000), i => AssertEmptySnapshot(target.GetSnapshot(false)));
target.Reset();
Parallel.ForEach(Enumerable.Range(1, 100000), i => AssertEmptySnapshot(target.GetSnapshot(false)));
Parallel.ForEach(Enumerable.Range(1, 1000), i => AssertEmptySnapshot(target.GetSnapshot(true)));
}
public void can_records_user_value()
{
var reservoir = new HdrHistogramReservoir(new Recorder(2));
reservoir.Update(2L, "B");
reservoir.Update(1L, "A");
var snapshot = reservoir.GetSnapshot();
snapshot.MinUserValue.Should().Be("A");
snapshot.Min.Should().Be(1L);
snapshot.MaxUserValue.Should().Be("B");
snapshot.Max.Should().Be(2L);
}
public void snap_shot_reflects_what_was_recorded()
{
var reservoir = new HdrHistogramReservoir(new Recorder(2));
for (var i = 0; i < 1000; i++)
{
reservoir.Update(i);
}
var snapshot = reservoir.GetSnapshot();
snapshot.Count.Should().Be(1000);
snapshot.Median.Should().Be(499);
snapshot.Mean.Should().BeApproximately(499, 1);
snapshot.Min.Should().Be(0);
snapshot.Max.Should().Be(999);
snapshot.Size.Should().Be(4608);
snapshot.Percentile75.Should().Be(751);
snapshot.Percentile95.Should().Be(951);
snapshot.Percentile98.Should().Be(979);
snapshot.Percentile99.Should().Be(991);
snapshot.Percentile999.Should().Be(999);
}
static void Main(string[] args)
{
var options = new Options();
if (!Parser.Default.ParseArguments(args, options, (t, o) => { target = t; targetOptions = o as CommonOptions; }))
{
Console.WriteLine(new CommonOptions().GetUsage());
Environment.Exit(CommandLine.Parser.DefaultExitCodeFail);
}
BenchmarkRunner.DefaultTotalSeconds = targetOptions.Seconds;
BenchmarkRunner.DefaultMaxThreads = targetOptions.MaxThreads;
//Metric.Config.WithHttpEndpoint("http://localhost:1234/");
switch (target)
{
case "noop":
BenchmarkRunner.Run("Noop", () => { });
break;
case "counter":
var counter = new CounterMetric();
BenchmarkRunner.Run("Counter", () => counter.Increment());
break;
case "meter":
var meter = new MeterMetric();
BenchmarkRunner.Run("Meter", () => meter.Mark());
break;
case "histogram":
var histogram = new HistogramMetric();
BenchmarkRunner.Run("Histogram", () => histogram.Update(137));
break;
case "timer":
var timer = new TimerMetric();
BenchmarkRunner.Run("Timer", () => timer.Record(1, TimeUnit.Milliseconds));
break;
case "hdrtimer":
var hdrTimer = new TimerMetric(new HdrHistogramReservoir());
BenchmarkRunner.Run("HDR Timer", () => hdrTimer.Record(1, TimeUnit.Milliseconds));
break;
case "ewma":
var ewma = EWMA.OneMinuteEWMA();
BenchmarkRunner.Run("EWMA", () => ewma.Update(1));
break;
case "edr":
var edr = new ExponentiallyDecayingReservoir();
BenchmarkRunner.Run("EDR", () => edr.Update(1));
break;
case "hdr":
var hdrReservoir = new HdrHistogramReservoir();
BenchmarkRunner.Run("HDR Recorder", () => hdrReservoir.Update(1));
break;
case "uniform":
var uniform = new UniformReservoir();
BenchmarkRunner.Run("Uniform", () => uniform.Update(1));
break;
case "sliding":
var sliding = new SlidingWindowReservoir();
BenchmarkRunner.Run("Sliding", () => sliding.Update(1));
break;
case "timerimpact":
var load = new WorkLoad();
BenchmarkRunner.Run("WorkWithoutTimer", () => load.DoSomeWork(), iterationsChunk: 10);
BenchmarkRunner.Run("WorkWithTimer", () => load.DoSomeWorkWithATimer(), iterationsChunk: 10);
break;
}
}
public void HdrHistogramReservoir()
{
var reservoir = new HdrHistogramReservoir();
Run(reservoir);
}