func TestEquals(t *testing.T) {
h1 := hdrhistogram.New(1, 10000000, 3)
for i := 0; i < 1000000; i++ {
if err := h1.RecordValue(int64(i)); err != nil {
t.Fatal(err)
}
}
h2 := hdrhistogram.New(1, 10000000, 3)
for i := 0; i < 10000; i++ {
if err := h1.RecordValue(int64(i)); err != nil {
t.Fatal(err)
}
}
if h1.Equals(h2) {
t.Error("Expected Histograms to not be equivalent")
}
h1.Reset()
h2.Reset()
if !h1.Equals(h2) {
t.Error("Expected Histograms to be equivalent")
}
}
func TestValueAtQuantile(t *testing.T) {
h := hdrhistogram.New(1, 10000000, 3)
for i := 0; i < 1000000; i++ {
if err := h.RecordValue(int64(i)); err != nil {
t.Fatal(err)
}
}
data := []struct {
q float64
v int64
}{
{q: 50, v: 500223},
{q: 75, v: 750079},
{q: 90, v: 900095},
{q: 95, v: 950271},
{q: 99, v: 990207},
{q: 99.9, v: 999423},
{q: 99.99, v: 999935},
}
for _, d := range data {
if v := h.ValueAtQuantile(d.q); v != d.v {
t.Errorf("P%v was %v, but expected %v", d.q, v, d.v)
}
}
}
func TestExportImport(t *testing.T) {
min := int64(1)
max := int64(10000000)
sigfigs := 3
h := hdrhistogram.New(min, max, sigfigs)
for i := 0; i < 1000000; i++ {
if err := h.RecordValue(int64(i)); err != nil {
t.Fatal(err)
}
}
s := h.Export()
if v := s.LowestTrackableValue; v != min {
t.Errorf("LowestTrackableValue was %v, but expected %v", v, min)
}
if v := s.HighestTrackableValue; v != max {
t.Errorf("HighestTrackableValue was %v, but expected %v", v, max)
}
if v := int(s.SignificantFigures); v != sigfigs {
t.Errorf("SignificantFigures was %v, but expected %v", v, sigfigs)
}
if imported := hdrhistogram.Import(s); !imported.Equals(h) {
t.Error("Expected Histograms to be equivalent")
}
}
func TestCumulativeDistribution(t *testing.T) {
h := hdrhistogram.New(1, 100000000, 3)
for i := 0; i < 1000000; i++ {
if err := h.RecordValue(int64(i)); err != nil {
t.Fatal(err)
}
}
actual := h.CumulativeDistribution()
expected := []hdrhistogram.Bracket{
hdrhistogram.Bracket{Quantile: 0, Count: 1, ValueAt: 0},
hdrhistogram.Bracket{Quantile: 50, Count: 500224, ValueAt: 500223},
hdrhistogram.Bracket{Quantile: 75, Count: 750080, ValueAt: 750079},
hdrhistogram.Bracket{Quantile: 87.5, Count: 875008, ValueAt: 875007},
hdrhistogram.Bracket{Quantile: 93.75, Count: 937984, ValueAt: 937983},
hdrhistogram.Bracket{Quantile: 96.875, Count: 969216, ValueAt: 969215},
hdrhistogram.Bracket{Quantile: 98.4375, Count: 984576, ValueAt: 984575},
hdrhistogram.Bracket{Quantile: 99.21875, Count: 992256, ValueAt: 992255},
hdrhistogram.Bracket{Quantile: 99.609375, Count: 996352, ValueAt: 996351},
hdrhistogram.Bracket{Quantile: 99.8046875, Count: 998400, ValueAt: 998399},
hdrhistogram.Bracket{Quantile: 99.90234375, Count: 999424, ValueAt: 999423},
hdrhistogram.Bracket{Quantile: 99.951171875, Count: 999936, ValueAt: 999935},
hdrhistogram.Bracket{Quantile: 99.9755859375, Count: 999936, ValueAt: 999935},
hdrhistogram.Bracket{Quantile: 99.98779296875, Count: 999936, ValueAt: 999935},
hdrhistogram.Bracket{Quantile: 99.993896484375, Count: 1000000, ValueAt: 1000447},
hdrhistogram.Bracket{Quantile: 100, Count: 1000000, ValueAt: 1000447},
}
if !reflect.DeepEqual(actual, expected) {
t.Errorf("CF was %#v, but expected %#v", actual, expected)
}
}
func BenchmarkNew(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
hdrhistogram.New(1, 120000, 3) // this could track 1ms-2min
}
}
func TestByteSize(t *testing.T) {
h := hdrhistogram.New(1, 100000, 3)
if v, want := h.ByteSize(), 65604; v != want {
t.Errorf("ByteSize was %v, but expected %d", v, want)
}
}
func TestRecordCorrectedValueStall(t *testing.T) {
h := hdrhistogram.New(1, 100000, 3)
if err := h.RecordCorrectedValue(1000, 100); err != nil {
t.Fatal(err)
}
if v, want := h.ValueAtQuantile(75), int64(800); v != want {
t.Errorf("Corrected value was %v, but expected %v", v, want)
}
}
func TestMax(t *testing.T) {
h := hdrhistogram.New(1, 10000000, 3)
for i := 0; i < 1000000; i++ {
if err := h.RecordValue(int64(i)); err != nil {
t.Fatal(err)
}
}
if v, want := h.Max(), int64(999936); v != want {
t.Errorf("Max was %v, but expected %v", v, want)
}
}
func TestStdDev(t *testing.T) {
h := hdrhistogram.New(1, 10000000, 3)
for i := 0; i < 1000000; i++ {
if err := h.RecordValue(int64(i)); err != nil {
t.Fatal(err)
}
}
if v, want := h.StdDev(), 288675.1403682715; v != want {
t.Errorf("StdDev was %v, but expected %v", v, want)
}
}
func TestMerge(t *testing.T) {
h1 := hdrhistogram.New(1, 1000, 3)
h2 := hdrhistogram.New(1, 1000, 3)
for i := 0; i < 100; i++ {
if err := h1.RecordValue(int64(i)); err != nil {
t.Fatal(err)
}
}
for i := 100; i < 200; i++ {
if err := h2.RecordValue(int64(i)); err != nil {
t.Fatal(err)
}
}
h1.Merge(h2)
if v, want := h1.ValueAtQuantile(50), int64(99); v != want {
t.Errorf("Median was %v, but expected %v", v, want)
}
}
func NewHDRHistogram(low, high int64, sigfigs int) (h *HDRHistogram, err error) {
defer func() {
if msg := recover(); msg != nil {
err = fmt.Errorf("%s", msg)
}
}()
return &HDRHistogram{
low: low,
high: high,
sigfigs: sigfigs,
h: hdrhistogram.New(low, high, sigfigs),
}, nil
}
func BenchmarkHistogramRecordValue(b *testing.B) {
h := hdrhistogram.New(1, 10000000, 3)
for i := 0; i < 1000000; i++ {
if err := h.RecordValue(int64(i)); err != nil {
b.Fatal(err)
}
}
b.ResetTimer()
b.ReportAllocs()
for i := 0; i < b.N; i++ {
h.RecordValue(100)
}
}
func TestHighSigFig(t *testing.T) {
input := []int64{
459876, 669187, 711612, 816326, 931423, 1033197, 1131895, 2477317,
3964974, 12718782,
}
hist := hdrhistogram.New(459876, 12718782, 5)
for _, sample := range input {
hist.RecordValue(sample)
}
if v, want := hist.ValueAtQuantile(50), int64(1048575); v != want {
t.Errorf("Median was %v, but expected %v", v, want)
}
}
func TestSubBucketMaskOverflow(t *testing.T) {
hist := hdrhistogram.New(2e7, 1e8, 5)
for _, sample := range [...]int64{1e8, 2e7, 3e7} {
hist.RecordValue(sample)
}
for q, want := range map[float64]int64{
50: 33554431,
83.33: 33554431,
83.34: 100663295,
99: 100663295,
} {
if got := hist.ValueAtQuantile(q); got != want {
t.Errorf("got %d for %fth percentile. want: %d", got, q, want)
}
}
}
func TestUnitMagnitudeOverflow(t *testing.T) {
h := hdrhistogram.New(0, 200, 4)
if err := h.RecordValue(11); err != nil {
t.Fatal(err)
}
}