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Re-use label builder in promql aggregation (#5641)

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For my benchmarks on aggregation this reduces allocations by ~5% (~10%
time improvement):

```
benchmark                                                    old ns/op     new ns/op     delta
BenchmarkEvaluations/benchdata/aggregators.test/promxy-4     727692        649626        -10.73%

benchmark                                                    old allocs     new allocs     delta
BenchmarkEvaluations/benchdata/aggregators.test/promxy-4     2566           2434           -5.14%

benchmark                                                    old bytes     new bytes     delta
BenchmarkEvaluations/benchdata/aggregators.test/promxy-4     162760        148854        -8.54%
```

Signed-off-by: Thomas Jackson <jacksontj.89@gmail.com>
This commit is contained in:
Thomas Jackson 2019-06-11 01:24:50 -07:00 committed by Brian Brazil
parent e23fa22233
commit a000cec011
2 changed files with 11 additions and 2 deletions
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7
pkg/labels/labels.go
View file

@ -292,6 +292,13 @@ func NewBuilder(base Labels) *Builder {
}
}
// Reset clears all current state for the builder
func (b *Builder) Reset(base Labels) {
b.base = base
b.del = b.del[:0]
b.add = b.add[:0]
}
// Del deletes the label of the given name.
func (b *Builder) Del(ns ...string) *Builder {
for _, n := range ns {

6
promql/engine.go
View file

@ -1718,11 +1718,13 @@ func (ev *evaluator) aggregation(op ItemType, grouping []string, without bool, p
}
}
lb := labels.NewBuilder(nil)
for _, s := range vec {
metric := s.Metric
if op == ItemCountValues {
lb := labels.NewBuilder(metric)
lb.Reset(metric)
lb.Set(valueLabel, strconv.FormatFloat(s.V, 'f', -1, 64))
metric = lb.Labels()
}
@ -1742,7 +1744,7 @@ func (ev *evaluator) aggregation(op ItemType, grouping []string, without bool, p
var m labels.Labels
if without {
lb := labels.NewBuilder(metric)
lb.Reset(metric)
lb.Del(grouping...)
lb.Del(labels.MetricName)
m = lb.Labels()