The arithmetic set engine — exact membership and intersection over uint64 IDs, in microseconds, with no payloads, no joins and no vector search.

SetrixDB is an in-memory, purely arithmetic engine written in Go, designed to sit beside your database (relational, columnar, KV or vector) as a fast index / pre-filter: it stores sets of IDs and answers "is this ID in the set?" and "which IDs are in both sets?" with vectorized (SIMD/AVX-512) arithmetic.

• Main engine: setrixdb/setrixdb — Apache-2.0
• Docs & benchmarks: docs/
• Website: https://setrixdb.com
• Write-up (the real numbers, and where it loses): https://dev.to/tgosoul/setrixdb-a-set-engine-in-go-exact-set-intersection-over-ids-and-where-it-loses-39dm
• Contact: contato@setrixdb.com

• Dense / sparse / hybrid bitsets
• MPHF (CHD v2) keygen — unique, dense IDs, 0 collisions
• AVX-512 AND+popcount kernel with runtime dispatch (portable scalar fallback)
• Sharding and a small cluster mode (consistent hash ring, zero-copy binary protocol)
• CLI, HTTP/JSON server, C ABI (FFI) and a public Go API

SetrixDB is an engine / set index — it stores sets of IDs, not payloads. It loses to Roaring on huge sparse universes, does not do range/similarity queries, and rebuilds the MPHF on frequent updates. See the README's "where it loses" section.

Start with the issues labeled good first issue. See CONTRIBUTING.md.