public void Mean_WhenPassed8And9_Returns8Point5()
{
var underTest = new Histogram(new ExponentiallyDecayingReservoir());
underTest.Update(9);
underTest.Update(8);
Assert.AreEqual(8.5, underTest.Snapshot.Mean);
}
public void Max_WhenPassed8And9_Returns9()
{
var underTest = new Histogram(new ExponentiallyDecayingReservoir());
underTest.Update(9);
underTest.Update(8);
Assert.AreEqual(9, underTest.Snapshot.Max);
}
public void Count_WhenPassedTwoValues_Returns2()
{
var underTest = new Histogram(new ExponentiallyDecayingReservoir());
underTest.Update(9);
underTest.Update(8);
Assert.AreEqual(2, underTest.Count);
}
public void ValidateMeanAndMedianDifferent()
{
var underTest = new Histogram(new ExponentiallyDecayingReservoir());
underTest.Update(7);
underTest.Update(8);
underTest.Update(12);
Assert.AreEqual(8, underTest.Snapshot.Median);
Assert.AreNotEqual(8, underTest.Snapshot.Mean);
}
private void reportHistogram(long timestamp, MetricName name, Histogram histogram)
{
Snapshot snapshot = histogram.Snapshot;
report(timestamp,
name,
"count,max,mean,min,stddev,p50,p75,p95,p98,p99,p999",
histogram.Count,
snapshot.Max,
snapshot.Mean,
snapshot.Min,
snapshot.StdDev,
snapshot.Median,
snapshot.Percentile75th,
snapshot.Percentile95th,
snapshot.Percentile98th,
snapshot.Percentile99th,
snapshot.Percentile999th);
}
private void reportHistogram(MetricName name, Histogram histogram, long timestamp)
{
Snapshot snapshot = histogram.Snapshot;
graphite.Send(Prefix(name, "count"), format(histogram.Count), timestamp);
graphite.Send(Prefix(name, "max"), format(snapshot.Max), timestamp);
graphite.Send(Prefix(name, "mean"), format(snapshot.Mean), timestamp);
graphite.Send(Prefix(name, "min"), format(snapshot.Min), timestamp);
graphite.Send(Prefix(name, "stddev"), format(snapshot.StdDev), timestamp);
graphite.Send(Prefix(name, "p50"), format(snapshot.Median), timestamp);
graphite.Send(Prefix(name, "p75"), format(snapshot.Percentile75th), timestamp);
graphite.Send(Prefix(name, "p95"), format(snapshot.Percentile95th), timestamp);
graphite.Send(Prefix(name, "p98"), format(snapshot.Percentile98th), timestamp);
graphite.Send(Prefix(name, "p99"), format(snapshot.Percentile99th), timestamp);
graphite.Send(Prefix(name, "p999"), format(snapshot.Percentile999th), timestamp);
}
private void printHistogram(Histogram histogram)
{
output.WriteLine(string.Format(" count = {0}", histogram.Count));
Snapshot snapshot = histogram.Snapshot;
output.WriteLine(string.Format(" min = {0}", snapshot.Min));
output.WriteLine(string.Format(" max = {0}", snapshot.Max));
output.WriteLine(string.Format(" mean = {0}", snapshot.Mean));
output.WriteLine(string.Format(" stddev = {0}", snapshot.StdDev));
output.WriteLine(string.Format(" median = {0}", snapshot.Median));
output.WriteLine(string.Format(" 75%% <= {0}", snapshot.Percentile75th));
output.WriteLine(string.Format(" 95%% <= {0}", snapshot.Percentile95th));
output.WriteLine(string.Format(" 98%% <= {0}", snapshot.Percentile98th));
output.WriteLine(string.Format(" 99%% <= {0}", snapshot.Percentile99th));
output.WriteLine(string.Format(" 99.9%% <= {0}", snapshot.Percentile999th));
}
