HDR histogram - Rust

Log-linear bucket histogram with significant-digit precision. Record p99 < 100 ns; percentile read sweeps the counter array.

Part of the submillisecond.com cookbook. Zero external dependencies; std only.

Install

[dependencies]
subms-hdr-histogram = "0.4"

Quickstart

cargo test --release
cargo run --example demo

Public API

• pub struct HdrHistogram
• pub fn new(significant_digits: u32) -> Self
• pub fn count(&self) -> u64
• pub fn max(&self) -> u64
• pub fn record(&mut self, value: u64)
• pub fn value_at_percentile(&self, q: f64) -> u64
• pub fn sub_count(&self) -> u32

Files

• src/lib.rs - implementation.
• tests/ - integration tests; correctness, edge cases, property/stress.
• examples/demo.rs - stdout walkthrough.
• examples/perf_main.rs - bench entry (behind the harness feature).

License

Dual-licensed under MIT OR Apache-2.0.