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We use the `metrics` / `prometheus` crate in the Pageserver code base. This PR demonstrates - typical performance pitfalls with that crate - our current set of techniques to avoid most of these pitfalls. refs - https://github.com/neondatabase/neon/issues/10948 - https://github.com/neondatabase/neon/pull/7202 - I applied the `label_values__cache_label_values_lookup` technique there. - It didn't yield measurable results in high-level benchmarks though.
Pageserver Benchmarks
How to run
To run all benchmarks:
cargo bench
To run a specific file:
cargo bench --bench bench_layer_map
To run a specific function:
cargo bench --bench bench_layer_map -- real_map_uniform_queries