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app/vmselect/netstorage: pre-allocate memory for metricNamesBuf

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This should reduce the number of metricNamesBuf re-allocations in append()
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Aliaksandr Valialkin 2024-01-23 21:34:14 +02:00
parent ae643ef1f1
commit 43ecd5d258
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GPG key ID: 52C003EE2BCDB9EB
1 changed files with 5 additions and 1 deletions
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6
app/vmselect/netstorage/netstorage.go
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@ -1155,7 +1155,11 @@ func ProcessSearchQuery(qt *querytracer.Tracer, sq *storage.SearchQuery, deadlin
// metricNamesBuf is used for holding all the loaded unique metric names at m and orderedMetricNames.
// It should reduce pressure on Go GC by reducing the number of string allocations
// when constructing metricName string from byte slice.
var metricNamesBuf []byte
metricNamesBufCap := maxSeriesCount * 100
if metricNamesBufCap > maxFastAllocBlockSize {
metricNamesBufCap = maxFastAllocBlockSize
}
metricNamesBuf := make([]byte, 0, metricNamesBufCap)
// brssPool is used for holding all the blockRefs objects across all the loaded time series.
// It should reduce pressure on Go GC by reducing the number of blockRefs allocations.