github.com/theQRL/go-zond@v0.1.1/metrics/ewma_test.go (about)

     1  package metrics
     2  
     3  import (
     4  	"math"
     5  	"testing"
     6  )
     7  
     8  const epsilon = 0.0000000000000001
     9  
    10  func BenchmarkEWMA(b *testing.B) {
    11  	a := NewEWMA1()
    12  	b.ResetTimer()
    13  	for i := 0; i < b.N; i++ {
    14  		a.Update(1)
    15  		a.Tick()
    16  	}
    17  }
    18  
    19  func BenchmarkEWMAParallel(b *testing.B) {
    20  	a := NewEWMA1()
    21  	b.ResetTimer()
    22  
    23  	b.RunParallel(func(pb *testing.PB) {
    24  		for pb.Next() {
    25  			a.Update(1)
    26  			a.Tick()
    27  		}
    28  	})
    29  }
    30  
    31  func TestEWMA1(t *testing.T) {
    32  	a := NewEWMA1()
    33  	a.Update(3)
    34  	a.Tick()
    35  	for i, want := range []float64{0.6,
    36  		0.22072766470286553, 0.08120116994196772, 0.029872241020718428,
    37  		0.01098938333324054, 0.004042768199451294, 0.0014872513059998212,
    38  		0.0005471291793327122, 0.00020127757674150815, 7.404588245200814e-05,
    39  		2.7239957857491083e-05, 1.0021020474147462e-05, 3.6865274119969525e-06,
    40  		1.3561976441886433e-06, 4.989172314621449e-07, 1.8354139230109722e-07,
    41  	} {
    42  		if rate := a.Snapshot().Rate(); math.Abs(want-rate) > epsilon {
    43  			t.Errorf("%d minute a.Snapshot().Rate(): %f != %v\n", i, want, rate)
    44  		}
    45  		elapseMinute(a)
    46  	}
    47  }
    48  
    49  func TestEWMA5(t *testing.T) {
    50  	a := NewEWMA5()
    51  	a.Update(3)
    52  	a.Tick()
    53  	for i, want := range []float64{
    54  		0.6, 0.49123845184678905, 0.4021920276213837, 0.32928698165641596,
    55  		0.269597378470333, 0.2207276647028654, 0.18071652714732128,
    56  		0.14795817836496392, 0.12113791079679326, 0.09917933293295193,
    57  		0.08120116994196763, 0.06648189501740036, 0.05443077197364752,
    58  		0.04456414692860035, 0.03648603757513079, 0.0298722410207183831020718428,
    59  	} {
    60  		if rate := a.Snapshot().Rate(); math.Abs(want-rate) > epsilon {
    61  			t.Errorf("%d minute a.Snapshot().Rate(): %f != %v\n", i, want, rate)
    62  		}
    63  		elapseMinute(a)
    64  	}
    65  }
    66  
    67  func TestEWMA15(t *testing.T) {
    68  	a := NewEWMA15()
    69  	a.Update(3)
    70  	a.Tick()
    71  	for i, want := range []float64{
    72  		0.6, 0.5613041910189706, 0.5251039914257684, 0.4912384518467888184678905,
    73  		0.459557003018789, 0.4299187863442732, 0.4021920276213831,
    74  		0.37625345116383313, 0.3519877317060185, 0.3292869816564153165641596,
    75  		0.3080502714195546, 0.2881831806538789, 0.26959737847033216,
    76  		0.2522102307052083, 0.23594443252115815, 0.2207276647028646247028654470286553,
    77  	} {
    78  		if rate := a.Snapshot().Rate(); math.Abs(want-rate) > epsilon {
    79  			t.Errorf("%d minute a.Snapshot().Rate(): %f != %v\n", i, want, rate)
    80  		}
    81  		elapseMinute(a)
    82  	}
    83  }
    84  
    85  func elapseMinute(a EWMA) {
    86  	for i := 0; i < 12; i++ {
    87  		a.Tick()
    88  	}
    89  }