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app/vmselect/netstorage: improve scalability of blocks processing on systems with multiple CPU cores

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Previously a single syncwg.WaitGroup was used for tracking the lifetime of processBlock callbacks
across all the per-vmstorage goroutines. This could be slow on systems with many CPU cores
because of inter-CPU synchronization overhead.

Use a separate per-vmstorage sync.WaitGroup instead in order to reduce inter-CPU synchronization overhead.
This should imrpove performance for heavy queries over big number of blocks on multi-CPU systems.
This commit is contained in:
Aliaksandr Valialkin 2022-08-11 21:37:21 +03:00
parent 690b505975
commit ec3df0b913
No known key found for this signature in database
GPG key ID: A72BEC6CD3D0DED1
2 changed files with 37 additions and 22 deletions
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57
app/vmselect/netstorage/netstorage.go
View file

@ -16,6 +16,7 @@ import (
"sync"
"sync/atomic"
"time"
"unsafe"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vmselect/searchutils"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
@ -28,7 +29,6 @@ import (
"github.com/VictoriaMetrics/VictoriaMetrics/lib/netutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/querytracer"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/storage"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/syncwg"
"github.com/VictoriaMetrics/metrics"
"github.com/cespare/xxhash/v2"
"github.com/valyala/fastrand"
@ -655,9 +655,9 @@ func RegisterMetricNames(qt *querytracer.Tracer, mrs []storage.MetricRow, deadli
}
// Push mrs to storage nodes in parallel.
snr := startStorageNodesRequest(qt, true, func(qt *querytracer.Tracer, idx int, sn *storageNode) interface{} {
snr := startStorageNodesRequest(qt, true, func(qt *querytracer.Tracer, workerIdx int, sn *storageNode) interface{} {
sn.registerMetricNamesRequests.Inc()
err := sn.registerMetricNames(qt, mrsPerNode[idx], deadline)
err := sn.registerMetricNames(qt, mrsPerNode[workerIdx], deadline)
if err != nil {
sn.registerMetricNamesErrors.Inc()
}
@ -686,7 +686,7 @@ func DeleteSeries(qt *querytracer.Tracer, sq *storage.SearchQuery, deadline sear
deletedCount int
err error
}
snr := startStorageNodesRequest(qt, true, func(qt *querytracer.Tracer, idx int, sn *storageNode) interface{} {
snr := startStorageNodesRequest(qt, true, func(qt *querytracer.Tracer, workerIdx int, sn *storageNode) interface{} {
sn.deleteSeriesRequests.Inc()
deletedCount, err := sn.deleteSeries(qt, requestData, deadline)
if err != nil {
@ -727,7 +727,7 @@ func LabelNames(qt *querytracer.Tracer, denyPartialResponse bool, sq *storage.Se
labelNames []string
err error
}
snr := startStorageNodesRequest(qt, denyPartialResponse, func(qt *querytracer.Tracer, idx int, sn *storageNode) interface{} {
snr := startStorageNodesRequest(qt, denyPartialResponse, func(qt *querytracer.Tracer, workerIdx int, sn *storageNode) interface{} {
sn.labelNamesRequests.Inc()
labelNames, err := sn.getLabelNames(qt, requestData, maxLabelNames, deadline)
if err != nil {
@ -829,7 +829,7 @@ func LabelValues(qt *querytracer.Tracer, denyPartialResponse bool, labelName str
labelValues []string
err error
}
snr := startStorageNodesRequest(qt, denyPartialResponse, func(qt *querytracer.Tracer, idx int, sn *storageNode) interface{} {
snr := startStorageNodesRequest(qt, denyPartialResponse, func(qt *querytracer.Tracer, workerIdx int, sn *storageNode) interface{} {
sn.labelValuesRequests.Inc()
labelValues, err := sn.getLabelValues(qt, labelName, requestData, maxLabelValues, deadline)
if err != nil {
@ -911,7 +911,7 @@ func TagValueSuffixes(qt *querytracer.Tracer, accountID, projectID uint32, denyP
suffixes []string
err error
}
snr := startStorageNodesRequest(qt, denyPartialResponse, func(qt *querytracer.Tracer, idx int, sn *storageNode) interface{} {
snr := startStorageNodesRequest(qt, denyPartialResponse, func(qt *querytracer.Tracer, workerIdx int, sn *storageNode) interface{} {
sn.tagValueSuffixesRequests.Inc()
suffixes, err := sn.getTagValueSuffixes(qt, accountID, projectID, tr, tagKey, tagValuePrefix, delimiter, maxSuffixes, deadline)
if err != nil {
@ -975,7 +975,7 @@ func TSDBStatus(qt *querytracer.Tracer, denyPartialResponse bool, sq *storage.Se
status *storage.TSDBStatus
err error
}
snr := startStorageNodesRequest(qt, denyPartialResponse, func(qt *querytracer.Tracer, idx int, sn *storageNode) interface{} {
snr := startStorageNodesRequest(qt, denyPartialResponse, func(qt *querytracer.Tracer, workerIdx int, sn *storageNode) interface{} {
sn.tsdbStatusRequests.Inc()
status, err := sn.getTSDBStatus(qt, requestData, focusLabel, topN, deadline)
if err != nil {
@ -1080,7 +1080,7 @@ func SeriesCount(qt *querytracer.Tracer, accountID, projectID uint32, denyPartia
n uint64
err error
}
snr := startStorageNodesRequest(qt, denyPartialResponse, func(qt *querytracer.Tracer, idx int, sn *storageNode) interface{} {
snr := startStorageNodesRequest(qt, denyPartialResponse, func(qt *querytracer.Tracer, workerIdx int, sn *storageNode) interface{} {
sn.seriesCountRequests.Inc()
n, err := sn.getSeriesCount(qt, accountID, projectID, deadline)
if err != nil {
@ -1213,7 +1213,7 @@ func SearchMetricNames(qt *querytracer.Tracer, denyPartialResponse bool, sq *sto
metricNames []string
err error
}
snr := startStorageNodesRequest(qt, denyPartialResponse, func(qt *querytracer.Tracer, idx int, sn *storageNode) interface{} {
snr := startStorageNodesRequest(qt, denyPartialResponse, func(qt *querytracer.Tracer, workerIdx int, sn *storageNode) interface{} {
sn.searchMetricNamesRequests.Inc()
metricNames, err := sn.processSearchMetricNames(qt, requestData, deadline)
if err != nil {
@ -1315,9 +1315,18 @@ func ProcessBlocks(qt *querytracer.Tracer, denyPartialResponse bool, sq *storage
requestData := sq.Marshal(nil)
// Make sure that processBlock is no longer called after the exit from ProcessBlocks() function.
// Use per-worker WaitGroup instead of a shared WaitGroup in order to avoid inter-CPU contention,
// which may siginificantly slow down the rate of processBlock calls on multi-CPU systems.
type wgWithPadding struct {
wg sync.WaitGroup
// Prevents false sharing on widespread platforms with
// 128 mod (cache line size) = 0 .
pad [128 - unsafe.Sizeof(sync.WaitGroup{})%128]byte
}
wgs := make([]wgWithPadding, len(storageNodes))
var stopped uint32
var wg syncwg.WaitGroup
f := func(mb *storage.MetricBlock) error {
f := func(mb *storage.MetricBlock, workerIdx int) error {
wg := &wgs[workerIdx].wg
wg.Add(1)
defer wg.Done()
if atomic.LoadUint32(&stopped) != 0 {
@ -1327,9 +1336,9 @@ func ProcessBlocks(qt *querytracer.Tracer, denyPartialResponse bool, sq *storage
}
// Send the query to all the storage nodes in parallel.
snr := startStorageNodesRequest(qt, denyPartialResponse, func(qt *querytracer.Tracer, idx int, sn *storageNode) interface{} {
snr := startStorageNodesRequest(qt, denyPartialResponse, func(qt *querytracer.Tracer, workerIdx int, sn *storageNode) interface{} {
sn.searchRequests.Inc()
err := sn.processSearchQuery(qt, requestData, f, deadline)
err := sn.processSearchQuery(qt, requestData, f, workerIdx, deadline)
if err != nil {
sn.searchErrors.Inc()
err = fmt.Errorf("cannot perform search on vmstorage %s: %w", sn.connPool.Addr(), err)
@ -1344,7 +1353,9 @@ func ProcessBlocks(qt *querytracer.Tracer, denyPartialResponse bool, sq *storage
})
// Make sure that processBlock is no longer called after the exit from ProcessBlocks() function.
atomic.StoreUint32(&stopped, 1)
wg.Wait()
for i := range wgs {
wgs[i].wg.Wait()
}
if err != nil {
return isPartial, fmt.Errorf("cannot fetch query results from vmstorage nodes: %w", err)
}
@ -1356,12 +1367,12 @@ type storageNodesRequest struct {
resultsCh chan interface{}
}
func startStorageNodesRequest(qt *querytracer.Tracer, denyPartialResponse bool, f func(qt *querytracer.Tracer, idx int, sn *storageNode) interface{}) *storageNodesRequest {
func startStorageNodesRequest(qt *querytracer.Tracer, denyPartialResponse bool, f func(qt *querytracer.Tracer, workerIdx int, sn *storageNode) interface{}) *storageNodesRequest {
resultsCh := make(chan interface{}, len(storageNodes))
for idx, sn := range storageNodes {
qtChild := qt.NewChild("rpc at vmstorage %s", sn.connPool.Addr())
go func(idx int, sn *storageNode) {
result := f(qtChild, idx, sn)
go func(workerIdx int, sn *storageNode) {
result := f(qtChild, workerIdx, sn)
resultsCh <- result
qtChild.Done()
}(idx, sn)
@ -1631,9 +1642,10 @@ func (sn *storageNode) processSearchMetricNames(qt *querytracer.Tracer, requestD
return metricNames, nil
}
func (sn *storageNode) processSearchQuery(qt *querytracer.Tracer, requestData []byte, processBlock func(mb *storage.MetricBlock) error, deadline searchutils.Deadline) error {
func (sn *storageNode) processSearchQuery(qt *querytracer.Tracer, requestData []byte, processBlock func(mb *storage.MetricBlock, workerIdx int) error,
workerIdx int, deadline searchutils.Deadline) error {
f := func(bc *handshake.BufferedConn) error {
if err := sn.processSearchQueryOnConn(bc, requestData, processBlock); err != nil {
if err := sn.processSearchQueryOnConn(bc, requestData, processBlock, workerIdx); err != nil {
return err
}
return nil
@ -2133,7 +2145,8 @@ func (sn *storageNode) processSearchMetricNamesOnConn(bc *handshake.BufferedConn
const maxMetricNameSize = 64 * 1024
func (sn *storageNode) processSearchQueryOnConn(bc *handshake.BufferedConn, requestData []byte, processBlock func(mb *storage.MetricBlock) error) error {
func (sn *storageNode) processSearchQueryOnConn(bc *handshake.BufferedConn, requestData []byte,
processBlock func(mb *storage.MetricBlock, workerIdx int) error, workerIdx int) error {
// Send the request to sn.
if err := writeBytes(bc, requestData); err != nil {
return fmt.Errorf("cannot write requestData: %w", err)
@ -2173,7 +2186,7 @@ func (sn *storageNode) processSearchQueryOnConn(bc *handshake.BufferedConn, requ
blocksRead++
sn.metricBlocksRead.Inc()
sn.metricRowsRead.Add(mb.Block.RowsCount())
if err := processBlock(&mb); err != nil {
if err := processBlock(&mb, workerIdx); err != nil {
return fmt.Errorf("cannot process MetricBlock #%d: %w", blocksRead, err)
}
}

2
docs/CHANGELOG.md
View file

@ -15,6 +15,8 @@ The following tip changes can be tested by building VictoriaMetrics components f
## tip
* FEATURE: [VictoriaMetrics cluster](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html): improve performance for heavy queries on systems with many CPU cores.
* BUGFIX: prevent from excess CPU usage when the storage enters [read-only mode](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#readonly-mode).
## [v1.80.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.80.0)