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Use jiffies in rate estimator.

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This avoids locking in estimate.
This commit is contained in:
Juliusz Chroboczek 2020-06-09 14:13:30 +02:00
parent f277b42e26
commit 2454e33df3
2 changed files with 31 additions and 34 deletions
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49
estimator/estimator.go
View file

@ -1,49 +1,47 @@
package estimator
import (
"sync"
"sync/atomic"
"time"
"sfu/rtptime"
)
type Estimator struct {
interval time.Duration
interval uint64
time uint64
bytes uint32
packets uint32
mu sync.Mutex
totalBytes uint32
totalPackets uint32
rate uint32
packetRate uint32
time time.Time
}
func New(interval time.Duration) *Estimator {
return &Estimator{
interval: interval,
time: time.Now(),
interval: rtptime.FromDuration(interval, rtptime.JiffiesPerSec),
time: rtptime.Now(rtptime.JiffiesPerSec),
}
}
func (e *Estimator) swap(now time.Time) {
interval := now.Sub(e.time)
func (e *Estimator) swap(now uint64) {
tm := atomic.LoadUint64(&e.time)
jiffies := now - tm
bytes := atomic.SwapUint32(&e.bytes, 0)
packets := atomic.SwapUint32(&e.packets, 0)
atomic.AddUint32(&e.totalBytes, bytes)
atomic.AddUint32(&e.totalPackets, packets)
if interval < time.Millisecond {
e.rate = 0
e.packetRate = 0
} else {
e.rate = uint32(uint64(bytes*1000) /
uint64(interval/time.Millisecond))
e.packetRate = uint32(uint64(packets*1000) /
uint64(interval/time.Millisecond))
var rate, packetRate uint32
if jiffies >= rtptime.JiffiesPerSec/1000 {
rate = uint32(uint64(bytes) * rtptime.JiffiesPerSec / jiffies)
packetRate =
uint32(uint64(packets) * rtptime.JiffiesPerSec / jiffies)
}
e.time = now
atomic.StoreUint32(&e.rate, rate)
atomic.StoreUint32(&e.packetRate, packetRate)
atomic.StoreUint64(&e.time, now)
}
func (e *Estimator) Accumulate(count uint32) {
@ -51,20 +49,17 @@ func (e *Estimator) Accumulate(count uint32) {
atomic.AddUint32(&e.packets, 1)
}
func (e *Estimator) estimate(now time.Time) (uint32, uint32) {
if now.Sub(e.time) > e.interval {
func (e *Estimator) estimate(now uint64) (uint32, uint32) {
tm := atomic.LoadUint64(&e.time)
if now < tm || now-tm > e.interval {
e.swap(now)
}
return e.rate, e.packetRate
return atomic.LoadUint32(&e.rate), atomic.LoadUint32(&e.packetRate)
}
func (e *Estimator) Estimate() (uint32, uint32) {
now := time.Now()
e.mu.Lock()
defer e.mu.Unlock()
return e.estimate(now)
return e.estimate(rtptime.Now(rtptime.JiffiesPerSec))
}
func (e *Estimator) Totals() (uint32, uint32) {

12
estimator/estimator_test.go
View file

@ -2,18 +2,20 @@ package estimator
import (
"testing"
"time"
"sfu/rtptime"
)
func TestEstimator(t *testing.T) {
now := time.Now()
e := New(time.Second)
now := rtptime.Jiffies()
e := New(rtptime.JiffiesPerSec)
e.estimate(now)
e.Accumulate(42)
e.Accumulate(128)
e.estimate(now.Add(time.Second))
rate, packetRate := e.estimate(now.Add(time.Second + time.Millisecond))
e.estimate(now + rtptime.JiffiesPerSec)
rate, packetRate :=
e.estimate(now + (rtptime.JiffiesPerSec * 1001) / 1000)
if rate != 42+128 {
t.Errorf("Expected %v, got %v", 42+128, rate)