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Merge pull request #704 from Arceliar/queues

Faster queue logic
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Arceliar 2020-05-30 18:39:33 -05:00 committed by GitHub
commit a1856258a9
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@ -1,10 +1,13 @@
package yggdrasil
import (
"math/rand"
"container/heap"
"time"
)
// TODO separate queues per e.g. traffic flow
// For now, we put everything in queue
type pqStreamID string
type pqPacketInfo struct {
@ -13,13 +16,13 @@ type pqPacketInfo struct {
}
type pqStream struct {
id pqStreamID
infos []pqPacketInfo
size uint64
}
// TODO separate queues per e.g. traffic flow
type packetQueue struct {
streams map[pqStreamID]pqStream
streams []pqStream
size uint64
}
@ -29,84 +32,87 @@ func (q *packetQueue) drop() bool {
if q.size == 0 {
return false
}
// select a random stream, odds based on stream size
offset := rand.Uint64() % q.size
var worst pqStreamID
var size uint64
for id, stream := range q.streams {
worst = id
size += stream.size
if size >= offset {
break
var longestIdx int
for idx := range q.streams {
if q.streams[idx].size > q.streams[longestIdx].size {
longestIdx = idx
}
}
// drop the oldest packet from the stream
worstStream := q.streams[worst]
packet := worstStream.infos[0].packet
worstStream.infos = worstStream.infos[1:]
worstStream.size -= uint64(len(packet))
q.size -= uint64(len(packet))
pool_putBytes(packet)
// save the modified stream to queues
if len(worstStream.infos) > 0 {
q.streams[worst] = worstStream
stream := q.streams[longestIdx]
info := stream.infos[0]
if len(stream.infos) > 1 {
stream.infos = stream.infos[1:]
stream.size -= uint64(len(info.packet))
q.streams[longestIdx] = stream
q.size -= uint64(len(info.packet))
heap.Fix(q, longestIdx)
} else {
delete(q.streams, worst)
heap.Remove(q, longestIdx)
}
pool_putBytes(info.packet)
return true
}
func (q *packetQueue) push(packet []byte) {
if q.streams == nil {
q.streams = make(map[pqStreamID]pqStream)
}
// get stream
id := pqStreamID(peer_getPacketCoords(packet)) // just coords for now
stream := q.streams[id]
// update stream
stream.infos = append(stream.infos, pqPacketInfo{packet, time.Now()})
stream.size += uint64(len(packet))
// save update to queues
q.streams[id] = stream
q.size += uint64(len(packet))
info := pqPacketInfo{packet: packet, time: time.Now()}
for idx := range q.streams {
if q.streams[idx].id == id {
q.streams[idx].infos = append(q.streams[idx].infos, info)
q.streams[idx].size += uint64(len(packet))
q.size += uint64(len(packet))
return
}
}
stream := pqStream{id: id, size: uint64(len(packet))}
stream.infos = append(stream.infos, info)
heap.Push(q, stream)
}
func (q *packetQueue) pop() ([]byte, bool) {
if len(q.streams) > 0 {
// get the stream that uses the least bandwidth
now := time.Now()
var best pqStreamID
for id := range q.streams {
best = id
break // get a random ID to start
}
bestStream := q.streams[best]
bestSize := float64(bestStream.size)
bestAge := now.Sub(bestStream.infos[0].time).Seconds()
for id, stream := range q.streams {
thisSize := float64(stream.size)
thisAge := now.Sub(stream.infos[0].time).Seconds()
// cross multiply to avoid division by zero issues
if bestSize*thisAge > thisSize*bestAge {
// bestSize/bestAge > thisSize/thisAge -> this uses less bandwidth
best = id
bestStream = stream
bestSize = thisSize
bestAge = thisAge
}
}
// get the oldest packet from the best stream
packet := bestStream.infos[0].packet
bestStream.infos = bestStream.infos[1:]
bestStream.size -= uint64(len(packet))
q.size -= uint64(len(packet))
// save the modified stream to queues
if len(bestStream.infos) > 0 {
q.streams[best] = bestStream
if q.size > 0 {
stream := q.streams[0]
info := stream.infos[0]
if len(stream.infos) > 1 {
stream.infos = stream.infos[1:]
stream.size -= uint64(len(info.packet))
q.streams[0] = stream
q.size -= uint64(len(info.packet))
heap.Fix(q, 0)
} else {
delete(q.streams, best)
heap.Remove(q, 0)
}
return packet, true
return info.packet, true
}
return nil, false
}
////////////////////////////////////////////////////////////////////////////////
// Interface methods for packetQueue to satisfy heap.Interface
func (q *packetQueue) Len() int {
return len(q.streams)
}
func (q *packetQueue) Less(i, j int) bool {
return q.streams[i].infos[0].time.Before(q.streams[j].infos[0].time)
}
func (q *packetQueue) Swap(i, j int) {
q.streams[i], q.streams[j] = q.streams[j], q.streams[i]
}
func (q *packetQueue) Push(x interface{}) {
stream := x.(pqStream)
q.streams = append(q.streams, stream)
q.size += stream.size
}
func (q *packetQueue) Pop() interface{} {
idx := len(q.streams) - 1
stream := q.streams[idx]
q.streams = q.streams[:idx]
q.size -= stream.size
return stream
}