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tsdb: use smaller allocation in blockBaseSeriesSet

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This reduces garbage, hence goes faster, when a short time range is
required compared to the amount of chunks in the block. For example
recording rules and alerts often look only at the last few minutes.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
This commit is contained in:
Bryan Boreham 2022-11-26 14:56:22 +00:00
parent 30b31cae93
commit 0c05f95e92
1 changed files with 8 additions and 1 deletions
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9
tsdb/querier.go
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@ -471,7 +471,14 @@ func (b *blockBaseSeriesSet) Next() bool {
var trimFront, trimBack bool
// Copy chunks as iterables are reusable.
chks := make([]chunks.Meta, 0, len(b.bufChks))
// Count those in range to size allocation (roughly - ignoring tombstones).
nChks := 0
for _, chk := range b.bufChks {
if !(chk.MaxTime < b.mint || chk.MinTime > b.maxt) {
nChks++
}
}
chks := make([]chunks.Meta, 0, nChks)
// Prefilter chunks and pick those which are not entirely deleted or totally outside of the requested range.
for _, chk := range b.bufChks {