# aappleby/smhasher

Automatically exported from code.google.com/p/smhasher

Repository: https://github.com/aappleby/smhasher
Canonical: https://ross.abutalabs.com/products/smhasher
Language: C++
License Family: other
Last push: 2026-06-25T05:35:57+00:00

## Health v2 (maintenance only)
Score: 72/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 89, release rhythm 35, longevity 100
- inputs: {"age_days": 4188, "days_push": 69, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2889, forks 481 (observed 2026-08-28T04:07:28.312529+00:00)

## What it is
SMHasher is a C++ test suite that evaluates the distribution, collision, and performance properties of non-cryptographic hash functions. It is also the home of the MurmurHash family of hash functions, including MurmurHash3.

## Use cases
- test the quality of a non-cryptographic hash function
- benchmark hash function speed and collision rates
- find flaws in popular hash functions
- get a fast general-purpose hash like MurmurHash3
- compare 32-bit and 128-bit hash implementations

## When to choose
- you need to validate or benchmark a non-cryptographic hash function
- you want a well-tested general-purpose hash like MurmurHash3 for hash tables or checksums

## When to avoid
- you need a cryptographic or secure hash function
- you need a maintained library with a formal license for the test suite itself

## Facets
- artifact type: library
- maturity: maintenance
- function: benchmarking, testing, developer-tools
- domain: developer-tools, performance
- platform: cpp, cross-platform, cli
- tags: hash-functions, murmurhash, non-cryptographic-hash, test-suite, hash-quality, algorithms

## Member repositories
- aappleby/smhasher (main) score 72

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:28.312529+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:35:21.028790+00:00, confidence not recorded.
  - readme: https://github.com/aappleby/smhasher (fetched 2026-08-28T04:07:28.312529+00:00, sha 88c95b0ae1f2)
- Data as of 2026-08-30T08:39:29.467469+00:00.