66 lines
1.4 KiB
Go
66 lines
1.4 KiB
Go
package stats
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import (
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"math/rand"
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"testing"
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"time"
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)
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func TestPercentiles(t *testing.T) {
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rand.Seed(time.Now().Unix())
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testUniformRandom(t, 1, 0.5)
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testUniformRandom(t, 1, 0.9)
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testUniformRandom(t, 1, 0.95)
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testUniformRandom(t, 10000, 0.5)
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testUniformRandom(t, 10000, 0.9)
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testUniformRandom(t, 10000, 0.95)
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}
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func testUniformRandom(t *testing.T, max, percentile float64) {
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p := NewPercentile(percentile, 256)
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for i := 0; i < 100000; i++ {
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p.AddSample(rand.Float64() * max)
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}
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got := p.Value()
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expected := percentile * max
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maxError := 0.01
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if got < expected*(1-maxError) || got > expected*(1+maxError) {
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t.Errorf("Percentile out of range\n actual: %f\nexpected: %f\n error: %f%%\n", got, expected, (got-expected)/expected*100)
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}
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}
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func BenchmarkPercentiles64(b *testing.B) {
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benchmarkUniformRandom(b, 64, 0.5)
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}
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func BenchmarkPercentiles128(b *testing.B) {
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benchmarkUniformRandom(b, 128, 0.5)
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}
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func BenchmarkPercentiles256(b *testing.B) {
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benchmarkUniformRandom(b, 256, 0.5)
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}
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func BenchmarkPercentiles512(b *testing.B) {
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benchmarkUniformRandom(b, 512, 0.5)
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}
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func benchmarkUniformRandom(b *testing.B, window int, percentile float64) {
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p := NewPercentile(percentile, window)
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numbers := make([]float64, b.N)
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for i := 0; i < b.N; i++ {
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numbers[i] = rand.Float64()
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}
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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p.AddSample(numbers[i])
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}
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}
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