ebca0c8921
Closes task #230. Measured PFlash NIAH compression at 16K-260K source contexts on 1× 24 GB / 3090 single-card. Result: PFlash works flawlessly up to 131K source. Compresses 131,068 tokens to 6,524 (5%) in 10.8s with NIAH key + answer both retained. Vanilla llama.cpp pp131072 takes ~257s per Luce's published numbers, so PFlash alone is ~24× faster at this context. End-to-end TTFT (PFlash + target prefill on 6.5K) would be ~12-13s vs ~257s = ~20×. Above 131K, drafter ephemeral forward-pass tensors (K_curr/V_curr/Q_last at full sequence length) exceed 24 GB. K-cache quantization (--pflash-k-type q8_0) doesn't help — the failing allocs are forward-pass not cache, confirmed by separate bench at 200K/260K with identical OOM at the same layer numbers. @weicj's PR #78 claim of 24K → 262K dual-GPU phase split is neither refuted nor reproduced. Their setup was 2× 22 GB Ti with target also loaded co-resident on one card; the "24K" was target+drafter combined. Our 131K is drafter-alone on 24 GB. Reproducing 262K specifically would require investigation of their drafter config (chunk_size, lookahead, BSA window) — drafter activation footprint at 200K+ is the binding constraint regardless of GPU count. Practical recommendation for 24 GB / 3090 single-card users: PFlash is shippable for source contexts ≤ 131K. The ~24× TTFT speedup is genuine and quality holds. Above 131K, fall back to vanilla llama.cpp prefill or wait for upstream drafter optimizations. Adds: - BENCHMARKS.md "PFlash long-context compression on 1× 3090" subsection with full per-context table + drafter ceiling explanation - results/lucebox-pflash-niah-20260504-150321/ (BF16 K cache run) - results/lucebox-pflash-niah-q8k-20260504-150600/ (q8_0 K cache run) This closes our active investigation of the Luce surface — three benches done (DFlash same-card 73.97 mean, K8V4 same-card 74.68 mean, PFlash compression ceiling 131K). Recommendation surface narrows to: PFlash at ≤131K is the one piece of Luce that beats vLLM dual.yml on TTFT for that workload class. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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| 1 | ts | phase | index | temp_c | fan_pct | power_w | power_limit_w | mem_used_mib | mem_total_mib | util_pct |
|---|---|---|---|---|---|---|---|---|---|---|
| 2 | 1777907191.039 | pflash_load | 0 | 43 | 0 | 27.92 | 230.00 | 1 | 24576 | 0 |
| 3 | 1777907191.039 | pflash_load | 1 | 49 | 0 | 22.60 | 230.00 | 1 | 24576 | 0 |
| 4 | 1777907192.089 | niah_ctx131068 | 0 | 47 | 0 | 83.13 | 230.00 | 18690 | 24576 | 17 |
| 5 | 1777907192.089 | niah_ctx131068 | 1 | 50 | 0 | 25.62 | 230.00 | 1 | 24576 | 0 |
| 6 | 1777907193.135 | niah_ctx131068 | 0 | 51 | 0 | 214.50 | 230.00 | 18944 | 24576 | 99 |
| 7 | 1777907193.135 | niah_ctx131068 | 1 | 50 | 0 | 26.32 | 230.00 | 1 | 24576 | 0 |
| 8 | 1777907194.195 | niah_ctx131068 | 0 | 53 | 0 | 227.52 | 230.00 | 19138 | 24576 | 100 |
| 9 | 1777907194.195 | niah_ctx131068 | 1 | 50 | 0 | 23.25 | 230.00 | 1 | 24576 | 0 |
| 10 | 1777907195.247 | niah_ctx131068 | 0 | 53 | 0 | 229.01 | 230.00 | 19138 | 24576 | 99 |
| 11 | 1777907195.247 | niah_ctx131068 | 1 | 49 | 0 | 22.55 | 230.00 | 1 | 24576 | 0 |
| 12 | 1777907196.291 | niah_ctx131068 | 0 | 54 | 0 | 227.81 | 230.00 | 18944 | 24576 | 100 |
| 13 | 1777907196.291 | niah_ctx131068 | 1 | 49 | 0 | 22.45 | 230.00 | 1 | 24576 | 0 |
| 14 | 1777907197.337 | niah_ctx131068 | 0 | 53 | 56 | 229.25 | 230.00 | 19138 | 24576 | 99 |
| 15 | 1777907197.337 | niah_ctx131068 | 1 | 49 | 0 | 22.45 | 230.00 | 1 | 24576 | 0 |
| 16 | 1777907198.384 | niah_ctx131068 | 0 | 54 | 52 | 227.66 | 230.00 | 19138 | 24576 | 100 |
| 17 | 1777907198.384 | niah_ctx131068 | 1 | 49 | 0 | 22.55 | 230.00 | 1 | 24576 | 0 |
| 18 | 1777907199.430 | niah_ctx131068 | 0 | 54 | 54 | 229.18 | 230.00 | 18944 | 24576 | 99 |
| 19 | 1777907199.430 | niah_ctx131068 | 1 | 49 | 0 | 22.46 | 230.00 | 1 | 24576 | 0 |
| 20 | 1777907200.474 | niah_ctx131068 | 0 | 53 | 56 | 211.57 | 230.00 | 21024 | 24576 | 94 |
| 21 | 1777907200.474 | niah_ctx131068 | 1 | 49 | 0 | 22.56 | 230.00 | 1 | 24576 | 0 |
| 22 | 1777907201.614 | niah_ctx131068 | 0 | 53 | 58 | 186.76 | 230.00 | 21024 | 24576 | 93 |
| 23 | 1777907201.614 | niah_ctx131068 | 1 | 49 | 0 | 22.60 | 230.00 | 1 | 24576 | 0 |
| 24 | 1777907202.805 | niah_ctx131068 | 0 | 53 | 58 | 186.52 | 230.00 | 2048 | 24576 | 84 |
| 25 | 1777907202.805 | niah_ctx131068 | 1 | 49 | 0 | 22.61 | 230.00 | 1 | 24576 | 0 |