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app/vmselect/promql: reduce the number of memory allocations inside copyTimeseriesShallow()

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Previously the number of memory allocations inside copyTimeseriesShallow() was equal to 1+len(tss)
Reduce this number to 2 by pre-allocating a slice of timeseries structs with len(tss) length.
This commit is contained in:
Aliaksandr Valialkin 2023-11-17 15:36:54 +01:00
parent c8e6e47e2a
commit faee0e43d1
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GPG Key ID: A72BEC6CD3D0DED1
1 changed files with 9 additions and 8 deletions
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17
app/vmselect/promql/transform.go
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@ -2743,14 +2743,15 @@ func copyTimeseriesMetricNames(tss []*timeseries, makeCopy bool) []*timeseries {
return rvs
}
// copyTimeseriesShallow returns a copy of arg with shallow copies of MetricNames,
// Timestamps and Values.
func copyTimeseriesShallow(arg []*timeseries) []*timeseries {
rvs := make([]*timeseries, len(arg))
for i, src := range arg {
var dst timeseries
dst.CopyShallow(src)
rvs[i] = &dst
// copyTimeseriesShallow returns a copy of src with shallow copies of MetricNames, Timestamps and Values.
func copyTimeseriesShallow(src []*timeseries) []*timeseries {
tss := make([]timeseries, len(src))
for i, src := range src {
tss[i].CopyShallow(src)
}
rvs := make([]*timeseries, len(tss))
for i := range tss {
rvs[i] = &tss[i]
}
return rvs
}