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app/vmselect/promql: pre-allocate memory for values to be merged in mergeTimeseries()

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This should reduce the number of memory re-allocations
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Aliaksandr Valialkin 2023-01-09 22:51:14 -08:00
parent 645c24dc5f
commit 30ed33fae0
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app/vmselect/promql/rollup_result_cache.go
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@ -525,6 +525,7 @@ func mergeTimeseries(a, b []*timeseries, bStart int64, ec *EvalConfig) []*timese
var tmp timeseries var tmp timeseries
tmp.denyReuse = true tmp.denyReuse = true
tmp.Timestamps = sharedTimestamps tmp.Timestamps = sharedTimestamps
tmp.Values = make([]float64, 0, len(tmp.Timestamps))
tmp.MetricName.MoveFrom(&tsA.MetricName) tmp.MetricName.MoveFrom(&tsA.MetricName)
tmp.Values = append(tmp.Values, tsA.Values...) tmp.Values = append(tmp.Values, tsA.Values...)