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bea5a0b99e
* feat(moe): --drop-cold-experts, spend quality only where it buys I/O Turbo top-k drops the tail of a routing whether or not those experts were already in RAM. A resident expert costs no flash read, so that trade pays quality for nothing on the ~80% of decode routings that are cache hits. This skips a routed expert only when it is a cache MISS and the router weighted it below frac x (1/top-k). Replayed over the committed route traces at frac 1.0, decode phase, that avoids 66% of flash reads for 9.5% of the router's weight mass, where --n-expert-used 5 avoids 23% for a comparable 10.6% -- about 3x the reads at the same quality cost. Implementation. The decision needs the FINAL router weights, which arrive several nodes after the topk where the streamer normally loads, so load_layer() is deferred to the terminal node of the layer's weight chain. Which node that is depends on the model's gating, so the hook learns it from the graph rather than carrying an architecture table; if it fails to arrive the hook forgets it and re-learns rather than re-betting. A dropped slot has its weight zeroed and its expert id repointed at the routing's top-weighted expert: an unread expert can sit in reserved-but-uncommitted VM and mul_mat_id would touch it anyway, so the kernel is given memory that is certainly resident and multiplies it by exactly zero. Requires the LRU cache -- with --cache-mb 0 residency reads all-miss and the policy would silently degenerate into an unconditional weight cut. Prefill is excluded by default. The top expert is always pinned, so no routing can be emptied at any threshold. Gates: G8a/G8a' prove the deferral and the learned terminal node are transparent (byte-identical output, zero drops, at a threshold below any producible weight); G8b that full strength against a constantly-evicting cache never reaches an unloaded slot; G8c that at top-k 1 dropping is a no-op, pinning both the top-expert guarantee and the threshold tracking the effective top-k. Three existing metrics shift meaning under dropping and the docs now say so: cache_hit_pct rises without the cache serving more (a dropped routing is a miss that is never looked up), and token/layer_demand measure what was staged rather than routed. prefetch.md's "cannot change output" is scoped, limitations.md gains the non-reproducibility entry, and benchmark-method.md warns that reversing the run order cannot distinguish a moved drop rate from a contaminated cell. Off by default in the CLI and in the app. The output is not reproducible -- what gets dropped depends on what the cache held -- so it carries no rows in the README tables, and switching it on by default waits on a published on-device A/B rather than on the replay argument alone. * feat(app): default cache-aware dropping to 75%, measured on device Qwen3.6-35B-A3B (top-k 8 of 256), in-app, cache 3000, one variable changed: 2.549 tok/s off, 3.938 at F=0.75 (+55%), 4.702 at F=1.0 (+84%), with flash reads falling 248 -> 163 -> 48 GiB. Per-token bootstrap intervals separate every pair except off vs 0.50, which overlaps -- at half the uniform share the policy drops 2.7% of routings and buys nothing, which doubles as a negative control that the machinery is free when it does not fire. Run order was 1.0, off, 0.5, 0.75, so the two fastest cells are the first and the LAST; thermal drift would have made the last the worst. The mechanism orders by threshold even though the run order does not. The replay turned out conservative rather than optimistic. It is documented as an upper bound because it cannot model the cache changing in response to dropping: at F=0.75 it was accurate (37% predicted, 34% measured), at F=1.0 it understated (66% predicted, 81% measured). Avoided reads free cache capacity, which raises the hit rate, which leaves fewer misses to drop. 75% rather than 100% is deliberate: it takes the larger part of the win for half the discarded routings (14% against 28%). Quality is still unquantified -- no perplexity number and no side-by-side exists -- so the conservative end of a measured range is the defensible default. The CLI stays off; the byte-identity gates need a deterministic default. Also records cache_hit_pct rising 67.8 -> 90.7% as the documented accounting artefact rather than the cache serving more, and majflt/token as dominated by each run's starting memory state, not by the threshold. |
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| .. | ||
| 2026-07-12 | ||
| 2026-07-12-pr23 | ||
| 2026-07-13 | ||
| 2026-07-14 | ||
| 2026-07-14-warmup | ||
| 2026-07-15-route-trace | ||
| 2026-07-17 | ||
| 2026-07-20-cache-replay | ||
| 2026-07-20-sidecar | ||
| 2026-07-21-pinned-dense-ab | ||
| 2026-07-21-pinned-memory | ||
| 2026-07-22-drop-cold-experts | ||
| README.md | ||
Benchmark data archive
Raw per-run CSVs and the session notes written alongside them, one directory per measurement session. Each directory is a historical record of the build it was captured on, kept for provenance so the tables in ../benchmarks.md can be traced back to data.
These files are not maintained. They are not corrected when the code moves on, and a recommendation inside one is only valid for the build it was measured against. Read the maintained docs for current guidance; read these to check where a number came from.
| Session | Captured against | Note |
|---|---|---|
2026-07-12/ |
baseline cache/lane sweep | Feeds the cache-and-lanes tables in benchmarks.md. |
2026-07-12-pr23/ |
temporal prefetch + speculative gating | Speculative gating no longer exists — it was removed to restore the modular seam. The --spec-gate rows and the advice about it describe a flag the CLI no longer accepts. |
2026-07-13/ |
adaptive cache budget | Source of the capped-auto recipe numbers. |
2026-07-14/ |
per-token warm-up | Feeds warmup-analysis.md. |
2026-07-14-warmup/ |
dense warm-up A/B | Feeds cache-sizing.md and warmup-analysis.md. |
2026-07-15-route-trace/ |
first --route-trace capture (Qwen / Gemma / gpt-oss) |
Routing data, not throughput: every run had the trace on, so its tok/s are not comparable with benchmarks.md and must not feed those tables. |
2026-07-17/ |
all-O_DIRECT dense weights (--dense-weights anon) |
Source of the gpt-oss steady-state numbers. Several cells are contaminated by run order (a fixed cooldown does not reach baseline) — NOTES.md marks exactly which, and which claims survive. Do not read a top-k or lane claim out of it. |