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## Problem Some developers build on MacOS, which doesn't have io_uring. ## Summary of changes - Add `io_engine_for_bench`, which on linux will give io_uring or panic if it's unavailable, and on MacOS will always panic. We do not want to run such benchmarks with StdFs: the results aren't interesting, and will actively waste the time of any developers who start investigating performance before they realize they're using a known-slow I/O backend. Why not just conditionally compile this benchmark on linux only? Because even on linux, I still want it to refuse to run if it can't get io_uring.
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