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Complete sync performance (#1741)

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* Parallelise PDU stream fetching for complete sync

* Fixes

* Fixes

* Worker queue

* Workers

* Don't populate device list changes on complete sync

* Don't fast-forward typing notifications either on complete sync

* Revert "Don't fast-forward typing notifications either on complete sync"
This reverts commit 01471f7843.

* Comments
This commit is contained in:
Neil Alexander 2021-01-29 16:32:54 +00:00 committed by GitHub
parent 6d1c6f29e0
commit 62a325ded8
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 61 additions and 12 deletions
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2
syncapi/streams/stream_devicelist.go
View file

@ -19,7 +19,7 @@ func (p *DeviceListStreamProvider) CompleteSync(
ctx context.Context,
req *types.SyncRequest,
) types.LogPosition {
return p.IncrementalSync(ctx, req, types.LogPosition{}, p.LatestPosition(ctx))
return p.LatestPosition(ctx)
}
func (p *DeviceListStreamProvider) IncrementalSync(

71
syncapi/streams/stream_pdu.go
View file

@ -2,18 +2,54 @@ package streams
import (
"context"
"sync"
"time"
"github.com/matrix-org/dendrite/syncapi/types"
userapi "github.com/matrix-org/dendrite/userapi/api"
"github.com/matrix-org/gomatrixserverlib"
"go.uber.org/atomic"
)
// The max number of per-room goroutines to have running.
// Too high and this will consume lots of CPU, too low and complete
// sync responses will take longer to process.
const PDU_STREAM_WORKERS = 256
// The maximum number of tasks that can be queued in total before
// backpressure will build up and the rests will start to block.
const PDU_STREAM_QUEUESIZE = PDU_STREAM_WORKERS * 8
type PDUStreamProvider struct {
StreamProvider
tasks chan func()
workers atomic.Int32
}
func (p *PDUStreamProvider) worker() {
defer p.workers.Dec()
for {
select {
case f := <-p.tasks:
f()
case <-time.After(time.Second * 10):
return
}
}
}
func (p *PDUStreamProvider) queue(f func()) {
if p.workers.Load() < PDU_STREAM_WORKERS {
p.workers.Inc()
go p.worker()
}
p.tasks <- f
}
func (p *PDUStreamProvider) Setup() {
p.StreamProvider.Setup()
p.tasks = make(chan func(), PDU_STREAM_QUEUESIZE)
p.latestMutex.Lock()
defer p.latestMutex.Unlock()
@ -52,19 +88,32 @@ func (p *PDUStreamProvider) CompleteSync(
eventFilter := req.Filter.Room.Timeline
// Build up a /sync response. Add joined rooms.
for _, roomID := range joinedRoomIDs {
var jr *types.JoinResponse
jr, err = p.getJoinResponseForCompleteSync(
ctx, roomID, r, &stateFilter, &eventFilter, req.Device,
)
if err != nil {
req.Log.WithError(err).Error("p.getJoinResponseForCompleteSync failed")
return from
}
req.Response.Rooms.Join[roomID] = *jr
req.Rooms[roomID] = gomatrixserverlib.Join
var reqMutex sync.Mutex
var reqWaitGroup sync.WaitGroup
reqWaitGroup.Add(len(joinedRoomIDs))
for _, room := range joinedRoomIDs {
roomID := room
p.queue(func() {
defer reqWaitGroup.Done()
var jr *types.JoinResponse
jr, err = p.getJoinResponseForCompleteSync(
ctx, roomID, r, &stateFilter, &eventFilter, req.Device,
)
if err != nil {
req.Log.WithError(err).Error("p.getJoinResponseForCompleteSync failed")
return
}
reqMutex.Lock()
defer reqMutex.Unlock()
req.Response.Rooms.Join[roomID] = *jr
req.Rooms[roomID] = gomatrixserverlib.Join
})
}
reqWaitGroup.Wait()
// Add peeked rooms.
peeks, err := p.DB.PeeksInRange(ctx, req.Device.UserID, req.Device.ID, r)
if err != nil {