Flix Datalog

flix-datalog

Purpose

Flix-as-a-stepping-stone for plurigrid/asi Datalog reasoning. Exists to be destroyed: the Flix JVM runtime is a clarity layer that will be subsumed by GPU-accelerated Datalog (Sun et al. 2023, arXiv:2311.02206).

Core Properties

Derangeable

No element ends up in the same position it started. A permutation σ is a derangement iff ∀i: σ(i) ≠ i. In skill composition: after routing through consensus, every agent must have shifted roles. Prevents fixed-point stagnation.

Already implemented: soft-machine/server/src/cluster/providers/rope.ts

get isDerangable(): boolean {
  return this.length !== 1;
}

Colorable

Elements are comparable via a partial order (lattice). Flix's key extension to Datalog: first-class lattice semantics. In skill composition: skills have a color (GF(3) trit) and you can compare them — finding optimal/minimal fixed points.

Flix Essentials

// Datalog as first-class values
let rules = #{
    Path(x, y) :- Edge(x, y).
    Path(x, z) :- Path(x, y), Edge(y, z).
};

// Lattice semantics: find shortest path (not just reachability)
lat ShortestPath(node: String, dist: Int32)

ShortestPath(src; 0).
ShortestPath(dst; d + w) :- ShortestPath(src; d), Edge(src, dst, w).

Destruction Trajectory

Flix (JVM, single-node)
  → Soufflé (C++, parallel, specialized)
    → GPU-Datalog (CUDA, 45x over Soufflé)
      → FPGA/photonic Datalog (future)

Each layer destroys the previous by being faster at the same semantics. The Flix skill captures the meaning; the runtime is disposable.

GPU-Accelerated Datalog (Sun et al.)

• Semi-naive evaluation on GPU with specialized hash joins
• Up to 45x speedup over Soufflé on data-center GPUs
• Key insight: Datalog's relational operations map to GPU-friendly parallel primitives (hash join, union, difference)
• Applications: static analysis, network monitoring, social-media mining

Integration with plurigrid/asi

┌─────────────┐     ┌──────────────┐     ┌─────────────┐
│ Flix Datalog  │ ──▶ │ GF(3) Lattice │ ──▶ │ Consensus    │
│ (rules)       │     │ (coloring)    │     │ (derangement)│
└─────────────┘     └──────────────┘     └─────────────┘

• Rules: declarative routing facts from epstein-library/datalog_*.clj
• Coloring: lattice semantics assign trits {-1, 0, +1} to skills
• Derangement: consensus ensures no agent stays in its original role

Dependencies

• JVM 21+ (for Flix compiler)
• Or: Clojure Datalog (Datascript/Datahike) as interim runtime
• Or: Babashka for scripting Datalog queries

References

• Madsen et al. "From Datalog to Flix" (PLDI 2016)
• Madsen "The Principles of the Flix Programming Language" (Onward! 2022)
• Sun et al. "Optimizing Datalog for the GPU" (arXiv:2311.02206)
• Paul Butcher "Introduction to Datalog in Flix" (4-part series)

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