WIP: Optimize storage.LabelQuerier.LabelValues implementations #525
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Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>
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Converting to draft since the modified algorithm performs much worse for some cases. |
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Try to make
storage.LabelQuerier.LabelValuesimplementations faster by, inlabelValuesWithMatchers, makingPostingsForMatchersintersect matched series with series containing the label name (through a special new match typeMatchSet). This eliminates the need to after the fact find series containing the label name and intersect with thePostingsForMatchersresult.I dropped the
maxExpandedPostingsoptimization, since I don't see it being relevant after my changes, but please point out if I'm wrong.Benchmark results are promising, geometric mean CPU time improvement looking to be ~59%, geometric mean memory usage reduction ~68%. I do see some of the benchmark cases looking much worse, I guess we'll have to look into those.
It doesn't look as if I've broken anything, considering the test suite passes, but please look carefully. I'm new to this code :)
Benchmark results for blocks (
go test -bench=BenchmarkQuerier/Block/labelValuesWithMatchers -benchmem -run='^$' -timeout=30m -count 6 ./tsdb):benchstat-blocks.txt
Benchmark results for heads (
go test -bench=BenchmarkQuerier/Head [benchstat-head.txt](https://github.com/grafana/mimir-prometheus/files/12440956/benchstat-head.txt) /labelValuesWithMatchers -benchmem -run='^$' -timeout=30m -count 6 ./tsdb):benchstat-head.txt