sitos

A distributed parameter store for compute pipelines, powered by Eclipse zenoh.

sitos (σῖτος — Greek for grain) delivers typed parameters and look-up tables to distributed compute processes — without timing bugs, and without copies on the hot path.

Key ideas

• Typed key-value store on the zenoh key space (bool / int64 / double / string / bytes), same API for scalars and large LUTs
• Session snapshots: computations see a consistent point-in-time view, isolated from concurrent external updates (O(1) via engine-native snapshots)
• Overlay + pub/sub: runtime changes propagate to all participants
• Zero-copy reads: subscriber-side in-process cache (std::span / read-only NumPy views)
• Pluggable storage engines: in-memory (zero deps) and RocksDB included; bring your own
• Wire-compatible with plain zenoh: any zenoh client in any language can read and write — no sitos library required
• C++20 core + Python bindings (nanobind)

Status

🚧 Pre-development. The design is complete; implementation is starting. See the design documents and the issue tracker for the roadmap (v0.1 → v1.0 milestones).

Building

# Linux
cmake --preset dev-linux
cmake --build --preset dev-linux
ctest --preset dev-linux

# Windows (Ninja)
cmake --preset dev-windows
cmake --build --preset dev-windows
ctest --preset dev-windows

See docs/06_build_test_packaging.md for full build options.

License

Apache-2.0