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89 lines
2.3 KiB
89 lines
2.3 KiB
package metrics
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import (
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"math"
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"testing"
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)
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const epsilon = 0.0000000000000001
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func BenchmarkEWMA(b *testing.B) {
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a := NewEWMA1()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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a.Update(1)
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a.Tick()
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}
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}
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func BenchmarkEWMAParallel(b *testing.B) {
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a := NewEWMA1()
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b.ResetTimer()
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b.RunParallel(func(pb *testing.PB) {
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for pb.Next() {
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a.Update(1)
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a.Tick()
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}
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})
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}
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func TestEWMA1(t *testing.T) {
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a := NewEWMA1()
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a.Update(3)
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a.Tick()
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for i, want := range []float64{0.6,
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0.22072766470286553, 0.08120116994196772, 0.029872241020718428,
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0.01098938333324054, 0.004042768199451294, 0.0014872513059998212,
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0.0005471291793327122, 0.00020127757674150815, 7.404588245200814e-05,
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2.7239957857491083e-05, 1.0021020474147462e-05, 3.6865274119969525e-06,
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1.3561976441886433e-06, 4.989172314621449e-07, 1.8354139230109722e-07,
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} {
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if rate := a.Snapshot().Rate(); math.Abs(want-rate) > epsilon {
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t.Errorf("%d minute a.Snapshot().Rate(): %f != %v\n", i, want, rate)
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}
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elapseMinute(a)
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}
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}
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func TestEWMA5(t *testing.T) {
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a := NewEWMA5()
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a.Update(3)
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a.Tick()
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for i, want := range []float64{
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0.6, 0.49123845184678905, 0.4021920276213837, 0.32928698165641596,
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0.269597378470333, 0.2207276647028654, 0.18071652714732128,
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0.14795817836496392, 0.12113791079679326, 0.09917933293295193,
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0.08120116994196763, 0.06648189501740036, 0.05443077197364752,
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0.04456414692860035, 0.03648603757513079, 0.0298722410207183831020718428,
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} {
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if rate := a.Snapshot().Rate(); math.Abs(want-rate) > epsilon {
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t.Errorf("%d minute a.Snapshot().Rate(): %f != %v\n", i, want, rate)
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}
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elapseMinute(a)
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}
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}
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func TestEWMA15(t *testing.T) {
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a := NewEWMA15()
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a.Update(3)
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a.Tick()
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for i, want := range []float64{
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0.6, 0.5613041910189706, 0.5251039914257684, 0.4912384518467888184678905,
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0.459557003018789, 0.4299187863442732, 0.4021920276213831,
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0.37625345116383313, 0.3519877317060185, 0.3292869816564153165641596,
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0.3080502714195546, 0.2881831806538789, 0.26959737847033216,
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0.2522102307052083, 0.23594443252115815, 0.2207276647028646247028654470286553,
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} {
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if rate := a.Snapshot().Rate(); math.Abs(want-rate) > epsilon {
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t.Errorf("%d minute a.Snapshot().Rate(): %f != %v\n", i, want, rate)
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}
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elapseMinute(a)
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}
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}
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func elapseMinute(a EWMA) {
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for i := 0; i < 12; i++ {
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a.Tick()
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}
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}
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