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I was bored on a train and I spent some amount of time trying to scratch
some nanoseconds off the Labels.Compare when running with stringlabels.
I would be ashamed to admit the real amount of time I spent on it.
The worst thing is, I can't really explain why this is performing so
much better, and someone should re-run the benchmarks on their machine
to confirm that it's not something related to general relativity because
the train is moving. I also added some extra real-life benchmark cases
with longer labelsets (these aren't the longest we have in production,
but kubernetes labelsets are fairly common in Prometheus so I thought it
would be nice to have them).
My benchmarks show this diff:
goos: darwin
goarch: arm64
pkg: github.com/prometheus/prometheus/model/labels
│ old │ new │
│ sec/op │ sec/op vs base │
Labels_Compare/equal 5.898n ± 0% 5.875n ± 1% -0.40% (p=0.037 n=10)
Labels_Compare/not_equal 11.78n ± 2% 11.01n ± 1% -6.54% (p=0.000 n=10)
Labels_Compare/different_sizes 4.959n ± 1% 4.906n ± 2% -1.05% (p=0.050 n=10)
Labels_Compare/lots 21.32n ± 0% 17.54n ± 5% -17.75% (p=0.000 n=10)
Labels_Compare/real_long_equal 15.06n ± 1% 14.92n ± 0% -0.93% (p=0.000 n=10)
Labels_Compare/real_long_different_end 25.20n ± 0% 24.43n ± 0% -3.04% (p=0.000 n=10)
geomean 11.86n 11.25n -5.16%
Signed-off-by: Oleg Zaytsev <mail@olegzaytsev.com>
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|---|---|---|
| .. | ||
| labels_common.go | ||
| labels_dedupelabels.go | ||
| labels_stringlabels.go | ||
| labels_test.go | ||
| labels.go | ||
| matcher_test.go | ||
| matcher.go | ||
| regexp_test.go | ||
| regexp.go | ||
| sharding_dedupelabels.go | ||
| sharding_stringlabels.go | ||
| sharding_test.go | ||
| sharding.go | ||
| test_utils.go | ||