Exemple #1
0
func BenchmarkWindowedHistogramRecordAndRotate(b *testing.B) {
	w := hdrhistogram.NewWindowed(3, 1, 10000000, 3)
	b.ReportAllocs()
	b.ResetTimer()

	for i := 0; i < b.N; i++ {
		if err := w.Current.RecordValue(100); err != nil {
			b.Fatal(err)
		}

		if i%100000 == 1 {
			w.Rotate()
		}
	}
}
Exemple #2
0
func TestWindowedHistogram(t *testing.T) {
	w := hdrhistogram.NewWindowed(2, 1, 1000, 3)

	for i := 0; i < 100; i++ {
		w.Current.RecordValue(int64(i))
	}
	w.Rotate()

	for i := 100; i < 200; i++ {
		w.Current.RecordValue(int64(i))
	}
	w.Rotate()

	for i := 200; i < 300; i++ {
		w.Current.RecordValue(int64(i))
	}

	if v, want := w.Merge().ValueAtQuantile(50), int64(199); v != want {
		t.Errorf("Median was %v, but expected %v", v, want)
	}
}
Exemple #3
0
// NewHistogram returns a windowed HDR histogram which drops data older than
// five minutes. The returned histogram is safe to use from multiple goroutines.
//
// Use a histogram to track the distribution of a stream of values (e.g., the
// latency associated with HTTP requests).
func NewHistogram(name string, minValue, maxValue int64, sigfigs int) *Histogram {
	hm.Lock()
	defer hm.Unlock()

	if _, ok := histograms[name]; ok {
		panic(name + " already exists")
	}

	hist := &Histogram{
		name: name,
		hist: hdrhistogram.NewWindowed(5, minValue, maxValue, sigfigs),
	}
	histograms[name] = hist

	Gauge(name+".P50").SetBatchFunc(hname(name), hist.merge, hist.valueAt(50))
	Gauge(name+".P75").SetBatchFunc(hname(name), hist.merge, hist.valueAt(75))
	Gauge(name+".P90").SetBatchFunc(hname(name), hist.merge, hist.valueAt(90))
	Gauge(name+".P95").SetBatchFunc(hname(name), hist.merge, hist.valueAt(95))
	Gauge(name+".P99").SetBatchFunc(hname(name), hist.merge, hist.valueAt(99))
	Gauge(name+".P999").SetBatchFunc(hname(name), hist.merge, hist.valueAt(99.9))

	return hist
}