Lab

For LLM tool-calling, do you retrieve fewer tools or inject more into the context window?

The measured retrieve-vs-inject frontier on a CPU-local model: how many tools you can put in context before it stops picking the right one. Real ToolRet labels, exact-match scoring, no LLM judge.

Prefix-cache routing raises your hit rate. What does it cost in cross-tenant fairness?

The cache-hit vs cross-tenant service-gap Pareto frontier across five routing policies, measured on real llama.cpp backends. Honest either way.

KV-cache eviction and quantization get tuned separately. Does treating them as one budget win?

On a real 12B transformer, a coupled budget allocator beats separable allocation held-out at equal budget. The interaction is real and worth allocating for.

How hard can you load a hash table before p99.9 probe counts fall apart?

A NEON group-probe funnel table sustains 99.9% load with bounded p99.9 probes, in a smaller footprint than a SwissTable forced to resize.

Do block-circulant local codes actually beat 2D Reed-Solomon for blockchain data-availability?

At high rate, block-circulant beats 2D-RS distance. First implementation and honest measurement, with a NEON GF(2^8) encoder and a coded-Merkle DAS sampler.

Can an approximate-membership filter stay cheap under skew without ever returning a false negative?

Yes. A NEON blocked filter fused with a skew-adaptive false-positive suppressor holds the no-false-negative invariant, exhaustively checked, while cutting false positives where the skew concentrates.

A semantic cache decides what to serve on a similarity threshold. Is a static threshold safe?

It's silently unsafe. A calibrated, safety-gated gate on a binary-quantized ANN core turns served-error into a target you control instead of a number you hope about.

How fast can content-defined chunking run on Apple Silicon, and does the fast path cost you dedup?

SeqCDC on a NEON fast path hits ~19 GiB/s on an M4. Gear stays the default: it dedups better and degrades more gracefully. blake3 content-addressed store underneath.