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AxHash is a high-performance deterministic hashing family for Rust and native systems languages.
If you only need AxHash in Rust, start with the axhash crate from this workspace. It is the simplest entrypoint and re-exports the core engine with a friendlier import path.
AxHash is optimized for real-world HashMap workloads, concurrent systems, cache-heavy applications, and high-throughput native runtimes.
- Deterministic hashing
- Seeded hashing support
- Streaming API
- Fast
HashMapintegration -
no_stdsupport - Cross-language FFI
- Concurrent-friendly design
Benchmarked with Criterion.rs on Apple Silicon (release mode).
| Benchmark | AxHash Performance |
|---|---|
HashMap get-hit (100k keys) |
~494 Melem/s |
HashMap get-miss (10k keys) |
~785 Melem/s |
HashMap insert-u64 (100k keys) |
~90 Melem/s |
u64 hashing throughput |
~2.0 Gelem/s |
| Thread-local concurrent hashing (8 threads) | ~750 Melem/s |
| Large-buffer throughput (64K) | ~94 GiB/s |
| Large-buffer throughput (4K) | ~100 GiB/s |
write_u64 latency |
~3 ns |
write_u128 latency |
~1.48 ns |
| Mixed struct hashing | ~290 Melem/s |
HashMap builder creation |
~1.3 ns |
| Workload | AxHash | DefaultHasher |
|---|---|---|
insert-u64 (100k) |
~90 Melem/s | ~44 Melem/s |
get-hit (100k) |
~494 Melem/s | ~183 Melem/s |
get-miss (10k) |
~785 Melem/s | ~280 Melem/s |
| Mixed workload | ~11.9 Melem/s | ~6.1 Melem/s |
| Threads | Throughput |
|---|---|
| 1 | ~230 Melem/s |
| 2 | ~420 Melem/s |
| 4 | ~691 Melem/s |
| 8 | ~752 Melem/s |
See full Criterion benchmark reports for detailed graphs and methodology.
-
axhash-core: low-level Rust core and
no_stdengine - axhash-ffi: stable C ABI
MIT