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Merge pull request #4165 from heyitsanthony/benchmark-stddev

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tools/benchmark: report standard deviation
This commit is contained in:
Anthony Romano 2016-01-07 16:00:26 -08:00
commit 383e11d528
1 changed files with 8 additions and 0 deletions
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8
tools/benchmark/cmd/report.go
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@ -18,6 +18,7 @@ package cmd
import ( import (
"fmt" "fmt"
"math"
"sort" "sort"
"strings" "strings"
"time" "time"
@ -37,6 +38,7 @@ type report struct {
fastest float64 fastest float64
slowest float64 slowest float64
average float64 average float64
stddev float64
rps float64 rps float64
results chan result results chan result
@ -91,6 +93,11 @@ func (r *report) finalize() {
r.rps = float64(len(r.lats)) / r.total.Seconds() r.rps = float64(len(r.lats)) / r.total.Seconds()
r.average = r.avgTotal / float64(len(r.lats)) r.average = r.avgTotal / float64(len(r.lats))
for i := range r.lats {
dev := r.lats[i] - r.average
r.stddev += dev * dev
}
r.stddev = math.Sqrt(r.stddev / float64(len(r.lats)))
} }
func (r *report) print() { func (r *report) print() {
@ -104,6 +111,7 @@ func (r *report) print() {
fmt.Printf(" Slowest:\t%4.4f secs.\n", r.slowest) fmt.Printf(" Slowest:\t%4.4f secs.\n", r.slowest)
fmt.Printf(" Fastest:\t%4.4f secs.\n", r.fastest) fmt.Printf(" Fastest:\t%4.4f secs.\n", r.fastest)
fmt.Printf(" Average:\t%4.4f secs.\n", r.average) fmt.Printf(" Average:\t%4.4f secs.\n", r.average)
fmt.Printf(" Stddev:\t%4.4f secs.\n", r.stddev)
fmt.Printf(" Requests/sec:\t%4.4f\n", r.rps) fmt.Printf(" Requests/sec:\t%4.4f\n", r.rps)
r.printHistogram() r.printHistogram()
r.printLatencies() r.printLatencies()