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app/vmselect/netstorage: pre-allocate 4 block references per each time series during querying
Usually the number of blocks returned per each time series during queries is around 4. So it is a good idea to pre-allocate 4 block references per time series in order to reduce the number of memory allocations.
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1 changed files with 3 additions and 1 deletions
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@ -1061,6 +1061,7 @@ func ProcessSearchQuery(qt *querytracer.Tracer, sq *storage.SearchQuery, deadlin
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maxSeriesCount := sr.Init(qt, vmstorage.Storage, tfss, tr, sq.MaxMetrics, deadline.Deadline())
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indexSearchDuration.UpdateDuration(startTime)
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type blockRefs struct {
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brsPrealloc [4]blockRef
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brs []blockRef
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}
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m := make(map[string]*blockRefs, maxSeriesCount)
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@ -1094,6 +1095,7 @@ func ProcessSearchQuery(qt *querytracer.Tracer, sq *storage.SearchQuery, deadlin
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brs := m[metricName]
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if brs == nil {
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brs = &blockRefs{}
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brs.brs = brs.brsPrealloc[:0]
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}
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brs.brs = append(brs.brs, blockRef{
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partRef: br.PartRef(),
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