Phase 7.2: Benchmark suite — profile-off / on-inactive / on-active - #22
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- benches/profile_bench.rs: three groups (small_allocs 32B, medium_allocs 4K, mixed 16..16384) x three variants (profile-off, profile-on-inactive at usize::MAX rate, profile-on-active at 512 KiB default rate). Hand-rolled main emits a stderr summary pointing at the ratio_idle metric used by CI to gate idle overhead at <= 5%. - Cargo.toml: criterion 0.5 (no default features) as a dev-dep, [[bench]] entry with harness = false. - benches/README.md: short doc on running, what ratio_idle means, why absolute numbers are host-specific.
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Summary
Criterion-based benchmark suite to measure SNMALLOC_PROFILE=ON overhead.
small_allocs(32B),medium_allocs(4KB),mixed(random 16..16384)set_sampling_rate(usize::MAX)), profile-on-active (default 524288)criterion = { version = "0.5", default-features = false }(no HTML report — JSON estimates only, keeps dep weight down)main()— final stderr summary points totarget/criterion/**/estimates.jsonand printsratio_idle = mean(profile-on-inactive) / mean(profile-off)(the metric CI is expected to gate on)#[global_allocator]wired — sampling-rate FFI is process-global; we measure variant-to-variant relative overhead, not absolute throughput vs system mallocbenches/README.mdincluded with run instructionsTest plan
cargo build(no features)cargo test(no features) — full suite greencargo bench --no-run(no features + --features profiling) — compiles cleanNote: actual
cargo benchruns take minutes — deferred to reviewer / CI.