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lib/streamaggr: use strings.Clone() instead of bytesutil.InternString() for creating series key in dedupAggr

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Our internal testing shows that this reduces GC overhead when deduplicating tens of millions of active series.
This commit is contained in:
Aliaksandr Valialkin 2024-06-10 16:05:49 +02:00
parent 9ed9e766e8
commit d269a95da3
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GPG key ID: 52C003EE2BCDB9EB
1 changed files with 10 additions and 12 deletions
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22
lib/streamaggr/dedup.go
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@ -1,6 +1,7 @@
package streamaggr
import (
"strings"
"sync"
"sync/atomic"
"unsafe"
@ -26,7 +27,7 @@ type dedupAggrShard struct {
type dedupAggrShardNopad struct {
mu sync.Mutex
m map[string]dedupAggrSample
m map[string]*dedupAggrSample
sizeBytes atomic.Uint64
itemsCount atomic.Uint64
@ -157,28 +158,25 @@ func (das *dedupAggrShard) pushSamples(samples []pushSample) {
m := das.m
if m == nil {
m = make(map[string]dedupAggrSample, len(samples))
m = make(map[string]*dedupAggrSample, len(samples))
das.m = m
}
for _, sample := range samples {
s, ok := m[sample.key]
if !ok {
key := bytesutil.InternString(sample.key)
m[key] = dedupAggrSample{
key := strings.Clone(sample.key)
m[key] = &dedupAggrSample{
value: sample.value,
timestamp: sample.timestamp,
}
das.itemsCount.Add(1)
das.sizeBytes.Add(uint64(len(key)) + uint64(unsafe.Sizeof("")+unsafe.Sizeof(dedupAggrSample{})))
das.sizeBytes.Add(uint64(len(key)) + uint64(unsafe.Sizeof(key)+unsafe.Sizeof(s)))
continue
}
// Update the existing value according to logic described at https://docs.victoriametrics.com/#deduplication
if sample.timestamp > s.timestamp || (sample.timestamp == s.timestamp && sample.value > s.value) {
key := bytesutil.InternString(sample.key)
m[key] = dedupAggrSample{
value: sample.value,
timestamp: sample.timestamp,
}
s.value = sample.value
s.timestamp = sample.timestamp
}
}
}
@ -188,7 +186,7 @@ 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.m = make(map[string]*dedupAggrSample, len(m))
das.sizeBytes.Store(0)
das.itemsCount.Store(0)
}
@ -208,7 +206,7 @@ func (das *dedupAggrShard) flush(ctx *dedupFlushCtx, f func(samples []pushSample
})
// Limit the number of samples per each flush in order to limit memory usage.
if len(dstSamples) >= 100_000 {
if len(dstSamples) >= 10_000 {
f(dstSamples)
clear(dstSamples)
dstSamples = dstSamples[:0]