public void should_report_the_rate_of_change() {
var minute = TimeSpan.FromMinutes(1);
var config = new MetricConfig("counter1");
var clock = new StepClock(TimeSpan.FromMinutes(1));
var context = new MetricContext(clock);
var counter = new StepCounter(config, context);
clock.TickNow(1);
counter.Increment(10);
Measure measure = Testing.Sync<Measure>(counter, counter.GetMeasure,
counter.context_);
Assert.That(measure.Value, Is.EqualTo(10d/minute.Ticks));
counter.OnStep();
clock.TickNow(1);
counter.Increment(10);
measure = Testing.Sync<Measure>(counter, counter.GetMeasure,
counter.context_);
Assert.That(measure.Value, Is.EqualTo(10d/minute.Ticks),
"Should report the same value as previously, since the rate was the same.");
counter.OnStep();
clock.TickNow(1);
counter.Increment(20);
measure = Testing.Sync<Measure>(counter, counter.GetMeasure,
counter.context_);
Assert.That(measure.Value, Is.EqualTo(10d/minute.Ticks*2),
"Should report the double of the previously value, since the rate was doubled.");
}
public void long_period_of_inactivity_should_not_corrupt_sampling_state() {
var clock = new StepClock(TimeSpan.FromMilliseconds(1));
var resevoir = new ExponentiallyDecayingResevoir(10, 0.015, clock);
// add 1000 values at a rate of 10 values/second.
for (int i = 0; i < 1000; i++) {
resevoir.Update(1000 + i);
clock.TickNow(100);
}
AssertAllValuesBetween(resevoir, 1000, 2000);
// wait for 15 hours and add another value.
// this should trigger a rescale. Note that the number of samples will be
// reduced to 2 because of the very small factor that will make all
// existing priorities equal to zero after rescale.
clock.TickNow(15*60*60*1000);
resevoir.Update(2000);
Assert.That(resevoir.Snapshot.Size, Is.EqualTo(2));
AssertAllValuesBetween(resevoir, 1000, 3000);
// add 1000 values at a rate of 10 values/second.
for (int i = 0; i < 1000; i++) {
resevoir.Update(3000 + i);
clock.TickNow(100);
}
Assert.That(resevoir.Snapshot.Size, Is.EqualTo(10));
AssertAllValuesBetween(resevoir, 3000, 4000);
}
public void should_report_the_rate_of_change()
{
var minute = TimeSpan.FromMinutes(1);
var config = new MetricConfig("counter1");
var clock = new StepClock(TimeSpan.FromMinutes(1));
var context = new MetricContext(clock);
var counter = new StepCounter(config, context);
clock.TickNow(1);
counter.Increment(10);
Measure measure = Testing.Sync <Measure>(counter, counter.GetMeasure,
counter.context_);
Assert.That(measure.Value, Is.EqualTo(10d / minute.Ticks));
counter.OnStep();
clock.TickNow(1);
counter.Increment(10);
measure = Testing.Sync <Measure>(counter, counter.GetMeasure,
counter.context_);
Assert.That(measure.Value, Is.EqualTo(10d / minute.Ticks),
"Should report the same value as previously, since the rate was the same.");
counter.OnStep();
clock.TickNow(1);
counter.Increment(20);
measure = Testing.Sync <Measure>(counter, counter.GetMeasure,
counter.context_);
Assert.That(measure.Value, Is.EqualTo(10d / minute.Ticks * 2),
"Should report the double of the previously value, since the rate was doubled.");
}
public void long_period_of_inactivity_should_not_corrupt_sampling_state()
{
var clock = new StepClock(TimeSpan.FromMilliseconds(1));
var resevoir = new ExponentiallyDecayingResevoir(10, 0.015, clock);
// add 1000 values at a rate of 10 values/second.
for (int i = 0; i < 1000; i++)
{
resevoir.Update(1000 + i);
clock.TickNow(100);
}
AssertAllValuesBetween(resevoir, 1000, 2000);
// wait for 15 hours and add another value.
// this should trigger a rescale. Note that the number of samples will be
// reduced to 2 because of the very small factor that will make all
// existing priorities equal to zero after rescale.
clock.TickNow(15 * 60 * 60 * 1000);
resevoir.Update(2000);
Assert.That(resevoir.Snapshot.Size, Is.EqualTo(2));
AssertAllValuesBetween(resevoir, 1000, 3000);
// add 1000 values at a rate of 10 values/second.
for (int i = 0; i < 1000; i++)
{
resevoir.Update(3000 + i);
clock.TickNow(100);
}
Assert.That(resevoir.Snapshot.Size, Is.EqualTo(10));
AssertAllValuesBetween(resevoir, 3000, 4000);
}
public void should_measure_the_total_time_per_step()
{
var minute = TimeSpan.FromMinutes(1);
var config = new MetricConfig("counter1");
var clock = new StepClock(TimeSpan.FromMinutes(1));
var context = new MetricContext(clock);
var timer =
new BucketTimer.Builder(config)
.WithBuckets(new long[] { 60, 120, 180 })
.WithTimeUnit(TimeUnit.Seconds)
.WithMeasureUnit(TimeUnit.Minutes)
.WithContext(context)
.Build();
IMetric total =
timer
.Metrics
.First(
x => x.Config.Tags.FirstOrDefault(t => t.Value == "total") != null);
clock.TickNow(1);
timer.Update(TimeSpan.FromSeconds(10));
timer.Update(TimeSpan.FromSeconds(10));
timer.Update(TimeSpan.FromSeconds(10));
var measure = Testing.Sync <Measure>(total, total.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(30d / 60));
OnStep(total);
clock.TickNow(1);
timer.Update(TimeSpan.FromSeconds(30));
measure = Testing.Sync <Measure>(total, total.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(30d / 60));
OnStep(total);
clock.TickNow(1);
timer.Update(TimeSpan.FromSeconds(60));
measure = Testing.Sync <Measure>(total, total.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(1));
}
public void should_measure_the_total_time_per_step() {
var minute = TimeSpan.FromMinutes(1);
var config = new MetricConfig("counter1");
var clock = new StepClock(TimeSpan.FromMinutes(1));
var context = new MetricContext(clock);
var timer =
new BucketTimer.Builder(config)
.WithBuckets(new long[] {60, 120, 180})
.WithTimeUnit(TimeUnit.Seconds)
.WithMeasureUnit(TimeUnit.Minutes)
.WithContext(context)
.Build();
IMetric total =
timer
.Metrics
.First(
x => x.Config.Tags.FirstOrDefault(t => t.Value == "total") != null);
clock.TickNow(1);
timer.Update(TimeSpan.FromSeconds(10));
timer.Update(TimeSpan.FromSeconds(10));
timer.Update(TimeSpan.FromSeconds(10));
var measure = Testing.Sync<Measure>(total, total.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(30d/60));
OnStep(total);
clock.TickNow(1);
timer.Update(TimeSpan.FromSeconds(30));
measure = Testing.Sync<Measure>(total, total.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(30d / 60));
OnStep(total);
clock.TickNow(1);
timer.Update(TimeSpan.FromSeconds(60));
measure = Testing.Sync<Measure>(total, total.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(1));
}
public void should_decrease_the_average_at_each_minute()
{
var m1_ewma = ExponentialWeightedMovingAverage
.ForOneMinute(new MetricConfig("test1"), TimeUnit.Seconds,
new MetricContext(mailbox_, step_clock_));
double offset = 0.000001;
m1_ewma.Mark(3, step_clock_.Tick);
step_clock_.TickNow(1);
Assert.That(m1_ewma.Compute(step_clock_.Tick).Value,
Is.InRange(0.6 - offset, 0.6 + offset));
var averages = new[] {
0.22072766,
0.08120117,
0.02987224,
0.01098938,
0.00404277,
0.00148725,
0.00054713,
0.00020128,
0.00007405,
0.00002724,
0.00001002,
0.00000369,
0.00000136,
0.00000050,
0.00000018
};
foreach (var average in averages)
{
step_clock_.TickNow(12); // 12* 5 seconds = 1 minute
Assert.That(m1_ewma.Compute(step_clock_.Tick).Value,
Is.InRange(average - offset, average + offset));
}
step_clock_.TickNow(10);
Assert.That(m1_ewma.Compute(step_clock_.Tick).Value,
Is.InRange(0.00000018 - offset, 0.00000018 + offset));
}
public void should_compute_the_mean_rate_of_values() {
var clock = new StepClock(TimeSpan.FromMilliseconds(1));
var mean = new MeanRate(new MetricConfig("test"), TimeUnit.Seconds,
new MetricContext(clock));
// add 1000 elemets at rate of 10 events/second
for (int i = 0; i < 1000; i++) {
mean.Mark();
clock.TickNow(100);
}
double value =
Testing.Sync<Measure>(mean, mean.GetMeasure, mean.context_).Value;
Assert.That(value, Is.EqualTo(10));
}
public void should_compute_the_mean_rate_of_values()
{
var clock = new StepClock(TimeSpan.FromMilliseconds(1));
var mean = new MeanRate(new MetricConfig("test"), TimeUnit.Seconds,
new MetricContext(clock));
// add 1000 elemets at rate of 10 events/second
for (int i = 0; i < 1000; i++)
{
mean.Mark();
clock.TickNow(100);
}
double value =
Testing.Sync <Measure>(mean, mean.GetMeasure, mean.context_).Value;
Assert.That(value, Is.EqualTo(10));
}
public void should_count_the_number_of_times_a_bucket_was_hit() {
var minute = TimeSpan.FromMinutes(1);
var config = new MetricConfig("counter1");
var clock = new StepClock(TimeSpan.FromMinutes(3));
var context = new MetricContext(clock);
var timer =
new BucketTimer.Builder(config)
.WithBuckets(new long[] { 60, 120, 180 })
.WithTimeUnit(TimeUnit.Seconds)
.WithMeasureUnit(TimeUnit.Minutes)
.WithContext(context)
.Build();
IMetric b60 = GetMetricWithTag(timer, "bucket=060s");
IMetric b120 = GetMetricWithTag(timer, "bucket=120s");
IMetric b180 = GetMetricWithTag(timer, "bucket=180s");
clock.TickNow(1);
timer.Update(TimeSpan.FromSeconds(10));
timer.Update(TimeSpan.FromSeconds(10));
timer.Update(TimeSpan.FromSeconds(10));
var measure = Testing.Sync<Measure>(b60, b60.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(1));
measure = Testing.Sync<Measure>(b120, b120.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(0));
measure = Testing.Sync<Measure>(b180, b180.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(0));
OnStep(b60, b120, b180);
clock.TickNow(1);
timer.Update(TimeSpan.FromSeconds(30));
timer.Update(TimeSpan.FromSeconds(61));
timer.Update(TimeSpan.FromSeconds(65));
measure = Testing.Sync<Measure>(b60, b60.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(1/3d));
measure = Testing.Sync<Measure>(b120, b120.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(2/3d));
measure = Testing.Sync<Measure>(b180, b180.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(0));
OnStep(b60, b120, b180);
clock.TickNow(1);
timer.Update(TimeSpan.FromSeconds(180));
measure = Testing.Sync<Measure>(b60, b60.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(0));
measure = Testing.Sync<Measure>(b120, b120.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(0));
measure = Testing.Sync<Measure>(b180, b180.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(1/3d));
}
public void should_count_the_number_of_times_a_bucket_was_hit()
{
var minute = TimeSpan.FromMinutes(1);
var config = new MetricConfig("counter1");
var clock = new StepClock(TimeSpan.FromMinutes(3));
var context = new MetricContext(clock);
var timer =
new BucketTimer.Builder(config)
.WithBuckets(new long[] { 60, 120, 180 })
.WithTimeUnit(TimeUnit.Seconds)
.WithMeasureUnit(TimeUnit.Minutes)
.WithContext(context)
.Build();
IMetric b60 = GetMetricWithTag(timer, "bucket=060s");
IMetric b120 = GetMetricWithTag(timer, "bucket=120s");
IMetric b180 = GetMetricWithTag(timer, "bucket=180s");
clock.TickNow(1);
timer.Update(TimeSpan.FromSeconds(10));
timer.Update(TimeSpan.FromSeconds(10));
timer.Update(TimeSpan.FromSeconds(10));
var measure = Testing.Sync <Measure>(b60, b60.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(1));
measure = Testing.Sync <Measure>(b120, b120.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(0));
measure = Testing.Sync <Measure>(b180, b180.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(0));
OnStep(b60, b120, b180);
clock.TickNow(1);
timer.Update(TimeSpan.FromSeconds(30));
timer.Update(TimeSpan.FromSeconds(61));
timer.Update(TimeSpan.FromSeconds(65));
measure = Testing.Sync <Measure>(b60, b60.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(1 / 3d));
measure = Testing.Sync <Measure>(b120, b120.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(2 / 3d));
measure = Testing.Sync <Measure>(b180, b180.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(0));
OnStep(b60, b120, b180);
clock.TickNow(1);
timer.Update(TimeSpan.FromSeconds(180));
measure = Testing.Sync <Measure>(b60, b60.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(0));
measure = Testing.Sync <Measure>(b120, b120.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(0));
measure = Testing.Sync <Measure>(b180, b180.GetMeasure, context);
Assert.That(measure.Value, Is.EqualTo(1 / 3d));
}
