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lib/streamaggr: improve performance for dedupAggr.sizeBytes() and dedupAggr.itemsCount()

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These functions are called every time `/metrics` page is scraped, so it would be great
if they could be sped up for the cases when dedupAggr tracks tens of millions of active time series.
This commit is contained in:
Aliaksandr Valialkin 2024-06-10 15:58:03 +02:00
parent f45d02a243
commit e8bb4359bb
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GPG key ID: 52C003EE2BCDB9EB
1 changed files with 10 additions and 19 deletions
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29
lib/streamaggr/dedup.go
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@ -2,6 +2,7 @@ package streamaggr
import (
"sync"
"sync/atomic"
"unsafe"
"github.com/cespare/xxhash/v2"
@ -26,6 +27,9 @@ type dedupAggrShard struct {
type dedupAggrShardNopad struct {
mu sync.Mutex
m map[string]dedupAggrSample
sizeBytes atomic.Uint64
itemsCount atomic.Uint64
}
type dedupAggrSample struct {
@ -43,7 +47,7 @@ func newDedupAggr() *dedupAggr {
func (da *dedupAggr) sizeBytes() uint64 {
n := uint64(unsafe.Sizeof(*da))
for i := range da.shards {
n += da.shards[i].sizeBytes()
n += da.shards[i].sizeBytes.Load()
}
return n
}
@ -51,28 +55,11 @@ func (da *dedupAggr) sizeBytes() uint64 {
func (da *dedupAggr) itemsCount() uint64 {
n := uint64(0)
for i := range da.shards {
n += da.shards[i].itemsCount()
n += da.shards[i].itemsCount.Load()
}
return n
}
func (das *dedupAggrShard) sizeBytes() uint64 {
das.mu.Lock()
n := uint64(unsafe.Sizeof(*das))
for k, s := range das.m {
n += uint64(len(k)) + uint64(unsafe.Sizeof(k)+unsafe.Sizeof(s))
}
das.mu.Unlock()
return n
}
func (das *dedupAggrShard) itemsCount() uint64 {
das.mu.Lock()
n := uint64(len(das.m))
das.mu.Unlock()
return n
}
func (da *dedupAggr) pushSamples(samples []pushSample) {
pss := getPerShardSamples()
shards := pss.shards
@ -181,6 +168,8 @@ func (das *dedupAggrShard) pushSamples(samples []pushSample) {
value: sample.value,
timestamp: sample.timestamp,
}
das.itemsCount.Add(1)
das.sizeBytes.Add(uint64(len(key)) + uint64(unsafe.Sizeof("")+unsafe.Sizeof(dedupAggrSample{})))
continue
}
// Update the existing value according to logic described at https://docs.victoriametrics.com/#deduplication
@ -200,6 +189,8 @@ func (das *dedupAggrShard) flush(ctx *dedupFlushCtx, f func(samples []pushSample
m := das.m
if len(m) > 0 {
das.m = make(map[string]dedupAggrSample, len(m))
das.sizeBytes.Store(0)
das.itemsCount.Store(0)
}
das.mu.Unlock()