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Merge pull request #192 from jaffee/alan-enhanced-stats

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Alan enhanced stats
This commit is contained in:
alanbernstein 2016-12-07 17:18:43 -06:00 • committed by GitHub
commit bc66081e5e
1 changed files with 16 additions and 5 deletions
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21
bench/stats.go
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@ -1,14 +1,17 @@
package bench
import (
"math"
"time"
)
type Stats struct {
Min time.Duration
Max time.Duration
Total time.Duration
Num int64
Min time.Duration
Max time.Duration
Mean time.Duration
sumSquareDelta float64
Total time.Duration
Num int64
}
func NewStats() *Stats {
@ -26,6 +29,12 @@ func (s *Stats) Add(td time.Duration) {
if td > s.Max {
s.Max = td
}
// online variance calculation
// https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#Online_algorithm
delta := td - s.Mean
s.Mean += delta / time.Duration(s.Num)
s.sumSquareDelta += float64(delta * (td - s.Mean))
}
func (s *Stats) Avg() time.Duration {
@ -35,5 +44,7 @@ func (s *Stats) Avg() time.Duration {
func AddToResults(s *Stats, results map[string]interface{}) {
results["min"] = s.Min
results["max"] = s.Max
results["avg"] = s.Avg()
results["avg"] = s.Mean
variance := s.sumSquareDelta / float64(s.Num)
results["std"] = time.Duration(math.Sqrt(variance))
}