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promql: inline nextSample function

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Move Sample out of loop to reduce allocations, otherwise it escapes to
the heap.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
This commit is contained in:
Bryan Boreham 2024-03-09 11:31:46 +00:00
parent 526ce4ee7a
commit 4584f67e17
1 changed files with 3 additions and 10 deletions
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13
promql/engine.go
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@ -2921,6 +2921,7 @@ func (ev *evaluator) aggregation(e *parser.AggregateExpr, q float64, inputMatrix
// For a range query, aggregates output in the seriess map.
func (ev *evaluator) aggregationK(e *parser.AggregateExpr, q float64, inputMatrix Matrix, seriesToResult []int, orderedResult []*groupedAggregation, enh *EvalNodeHelper, seriess map[uint64]Series) (Matrix, annotations.Annotations) {
op := e.Op
var s Sample
var annos annotations.Annotations
seen := make([]bool, len(orderedResult)) // Which output groups were seen in the input at this timestamp.
if !convertibleToInt64(q) {
@ -2935,10 +2936,11 @@ func (ev *evaluator) aggregationK(e *parser.AggregateExpr, q float64, inputMatri
}
for si := range inputMatrix {
s, ok := ev.nextSample(enh.Ts, inputMatrix, si)
f, _, ok := ev.nextValues(enh.Ts, &inputMatrix[si])
if !ok {
continue
}
s = Sample{Metric: inputMatrix[si].Metric, F: f}
group := orderedResult[seriesToResult[si]]
// Initialize this group if it's the first time we've seen it.
@ -3111,15 +3113,6 @@ func (ev *evaluator) nextValues(ts int64, series *Series) (f float64, h *histogr
return f, h, true
}
func (ev *evaluator) nextSample(ts int64, inputMatrix Matrix, si int) (Sample, bool) {
f, h, ok := ev.nextValues(ts, &inputMatrix[si])
ev.currentSamples++
if ev.currentSamples > ev.maxSamples {
ev.error(ErrTooManySamples(env))
}
return Sample{Metric: inputMatrix[si].Metric, F: f, H: h, T: ts}, ok
}
// groupingKey builds and returns the grouping key for the given metric and
// grouping labels.
func generateGroupingKey(metric labels.Labels, grouping []string, without bool, buf []byte) (uint64, []byte) {