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package main | |
import ( | |
"fmt" | |
"math/rand" | |
"sort" | |
"sync" | |
"time" | |
"github.com/RussellLuo/timingwheel" | |
) | |
func main() { | |
rand.Seed(time.Now().UTC().UnixNano()) | |
counts := []int{1000, 2000, 3000, 5000, 8000, 10000} | |
for _, count := range counts { | |
profileBuiltinTimers(count) | |
} | |
} | |
func profileBuiltinTimers(count int) { | |
buffers := make(chan time.Duration, count) | |
var waitGroup sync.WaitGroup | |
waitGroup.Add(count) | |
for i := 0; i < count; i++ { | |
go func() { | |
defer waitGroup.Done() | |
start := time.Now() | |
select { | |
case <-time.After(10 * time.Millisecond): | |
end := time.Now() | |
buffers <- end.Sub(start) | |
} | |
}() | |
} | |
waitGroup.Wait() | |
close(buffers) | |
sum := time.Duration(0) | |
durations := []time.Duration{} | |
for time := range buffers { | |
sum += time | |
durations = append(durations, time) | |
} | |
sort.Slice(durations, func(i, j int) bool { | |
return durations[i] < durations[j] | |
}) | |
fmt.Printf("with %d timers\n", count) | |
fmt.Println("max\t", durations[count-1]) | |
fmt.Println("pct99\t", durations[int(float64(count)*0.99)]) | |
fmt.Println("pct95\t", durations[int(float64(count)*0.95)]) | |
fmt.Println("avg\t", sum/time.Duration(count)) | |
fmt.Println("pct5\t", durations[int(float64(count)*0.05)]) | |
fmt.Println("pct1\t", durations[int(float64(count)*0.01)]) | |
fmt.Println("min\t", durations[0]) | |
} | |
func profileTimers(count int) { | |
buffers := make(chan time.Duration, count) | |
var waitGroup sync.WaitGroup | |
waitGroup.Add(count) | |
tws := []*timingwheel.TimingWheel{} | |
twCount := 1 | |
for i := 0; i < twCount; i++ { | |
tw := timingwheel.NewTimingWheel(3000*time.Microsecond, 4) | |
tw.Start() | |
tws = append(tws, tw) | |
} | |
for i := 0; i < count; i++ { | |
twIndex := rand.Intn(len(tws)) | |
go func() { | |
defer waitGroup.Done() | |
start := time.Now() | |
ch := make(chan int) | |
tws[twIndex].AfterFunc(10*time.Millisecond, func() { | |
ch <- 1 | |
}) | |
select { | |
case <-ch: | |
end := time.Now() | |
buffers <- end.Sub(start) | |
} | |
}() | |
} | |
waitGroup.Wait() | |
close(buffers) | |
for _, tw := range tws { | |
tw.Stop() | |
} | |
sum := time.Duration(0) | |
durations := []time.Duration{} | |
for time := range buffers { | |
sum += time | |
durations = append(durations, time) | |
} | |
sort.Slice(durations, func(i, j int) bool { | |
return durations[i] < durations[j] | |
}) | |
fmt.Printf("with %d timers\n", count) | |
fmt.Println("max\t", durations[count-1]) | |
fmt.Println("pct99\t", durations[int(float64(count)*0.99)]) | |
fmt.Println("pct95\t", durations[int(float64(count)*0.95)]) | |
fmt.Println("avg\t", sum/time.Duration(count)) | |
fmt.Println("pct5\t", durations[int(float64(count)*0.05)]) | |
fmt.Println("pct1\t", durations[int(float64(count)*0.01)]) | |
fmt.Println("min\t", durations[0]) | |
} | |
func profileTimerWithFixQPS(qps int) { | |
buffer := make(chan struct{}, qps) | |
tw := timingwheel.NewTimingWheel(3000*time.Microsecond, 10) | |
tw.Start() | |
count := 0 | |
fatal := 0 | |
var lock sync.Mutex | |
for { | |
count++ | |
buffer <- struct{}{} | |
go func() { | |
start := time.Now() | |
ch := make(chan int) | |
tw.AfterFunc(10*time.Millisecond, func() { | |
ch <- 1 | |
}) | |
select { | |
case <-ch: | |
timeouts := time.Since(start) | |
if timeouts > 20*time.Millisecond { | |
lock.Lock() | |
fatal++ | |
lock.Unlock() | |
} | |
} | |
fmt.Printf("%d/%d\n", fatal, count) | |
<-buffer | |
}() | |
} | |
} |
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