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https://github.com/VictoriaMetrics/VictoriaMetrics.git
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36be090cd5
- Use bytesutil.InternString() instead of strings.Clone() for inputKey and outputKey in aggregatorpushSamples(). This should reduce string allocation rate, since strings can be re-used between aggrState flushes. - Reduce memory allocations at dedupAggrShard by storing dedupAggrSample by value in the active series map. - Remove duplicate call to bytesutil.InternBytes() at Deduplicator, since it is already called inside dedupAggr.pushSamples(). - Add missing string interning at rateAggrState.pushSamples(). Updates https://github.com/VictoriaMetrics/VictoriaMetrics/pull/6402
85 lines
2 KiB
Go
85 lines
2 KiB
Go
package streamaggr
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import (
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"sync"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/fasttime"
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)
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// stdvarAggrState calculates output=stdvar, e.g. the average value over input samples.
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type stdvarAggrState struct {
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m sync.Map
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}
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type stdvarStateValue struct {
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mu sync.Mutex
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count float64
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avg float64
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q float64
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deleted bool
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}
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func newStdvarAggrState() *stdvarAggrState {
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return &stdvarAggrState{}
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}
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func (as *stdvarAggrState) pushSamples(samples []pushSample) {
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for i := range samples {
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s := &samples[i]
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outputKey := getOutputKey(s.key)
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again:
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v, ok := as.m.Load(outputKey)
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if !ok {
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// The entry is missing in the map. Try creating it.
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v = &stdvarStateValue{}
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outputKey = bytesutil.InternString(outputKey)
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vNew, loaded := as.m.LoadOrStore(outputKey, v)
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if loaded {
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// Use the entry created by a concurrent goroutine.
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v = vNew
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}
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}
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sv := v.(*stdvarStateValue)
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sv.mu.Lock()
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deleted := sv.deleted
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if !deleted {
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// See `Rapid calculation methods` at https://en.wikipedia.org/wiki/Standard_deviation
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sv.count++
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avg := sv.avg + (s.value-sv.avg)/sv.count
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sv.q += (s.value - sv.avg) * (s.value - avg)
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sv.avg = avg
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}
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sv.mu.Unlock()
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if deleted {
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// The entry has been deleted by the concurrent call to flushState
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// Try obtaining and updating the entry again.
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goto again
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}
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}
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}
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func (as *stdvarAggrState) flushState(ctx *flushCtx, resetState bool) {
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currentTimeMsec := int64(fasttime.UnixTimestamp()) * 1000
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m := &as.m
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m.Range(func(k, v interface{}) bool {
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if resetState {
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// Atomically delete the entry from the map, so new entry is created for the next flush.
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m.Delete(k)
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}
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sv := v.(*stdvarStateValue)
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sv.mu.Lock()
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stdvar := sv.q / sv.count
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if resetState {
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// Mark the entry as deleted, so it won't be updated anymore by concurrent pushSample() calls.
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sv.deleted = true
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}
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sv.mu.Unlock()
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key := k.(string)
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ctx.appendSeries(key, "stdvar", currentTimeMsec, stdvar)
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return true
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})
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}
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