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package irtt
import (
"math"
"runtime"
"runtime/debug"
"time"
)
const minHistBins = 25
const maxHistBins = 10
func runTimer(args []string) {
debug.SetGCPercent(-1)
runtime.GC()
printf("Testing timer characteristics...")
min := time.Duration(math.MaxInt64)
max := time.Duration(math.MinInt64)
start := time.Now()
last := time.Now()
for {
d := time.Since(last)
if d > 0 && d < min {
min = d
}
if d > max {
max = d
}
if time.Since(start) > 1*time.Second {
break
}
last = time.Now()
}
zeroes := 0
hmin := make([]int, minHistBins)
hmax := make([]int, maxHistBins)
outliers := 0
start = time.Now()
last = time.Now()
n := 0
for {
d := time.Since(last)
if d == 0 {
zeroes++
}
if d > 0 && d < min*minHistBins {
hmin[d/min]++
}
if d > 0 && d < max {
hmax[d/(max/maxHistBins)]++
}
if d >= max {
outliers++
}
if time.Since(start) > 1*time.Second {
break
}
n++
last = time.Now()
}
printf("")
printf("Histogram relative to minimum nonzero duration (low high count):")
setTabWriter(0)
for i := int64(0); i < minHistBins; i++ {
l := i * min.Nanoseconds()
if l == 0 {
l = 1
}
h := (i+1)*min.Nanoseconds() - 1
printf("%s\t%s\t%d", time.Duration(l), time.Duration(h), hmin[i])
}
printf("")
printf("Histogram relative to maximum duration (low high count):")
setTabWriter(0)
for i := int64(0); i < maxHistBins; i++ {
l := int64(float64(i) * (float64(max.Nanoseconds()) / float64(maxHistBins)))
if l == 0 {
l = 1
}
h := int64((float64(i)+1)*(float64(max.Nanoseconds())/float64(maxHistBins))) - int64(1)
printf("%s\t%s\t%d", time.Duration(l), time.Duration(h), hmax[i])
}
printf("")
setTabWriter(0)
printf("Statistics:")
printf("Minimum nonzero duration\t%s", min)
printf("Maximum duration\t%s", max)
printf("Zeroes\t%d / %d", zeroes, n)
printf("Outliers\t%d / %d", outliers, n)
flush()
}
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