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LocalAI/backend/cpp
Ettore Di Giacinto c8b1f16507 docs(paged): dense NVFP4 fair re-run with max_prefill_tokens budget sweep
Re-run the dense Qwen3.6-27B NVFP4 vs vLLM A/B with patch 0013's QoS
prefill budget enabled (LLAMA_PREFILL_BUDGET swept over 256/512/1024),
fixing the prior run that left prefill unbounded and let high-concurrency
prefills starve each other.

At the saturated npl128 point budget=256 is the best lever: decode_agg
134.6 -> 161.2 tok/s (+19.8%) and TTFT 491.2 s -> 305.4 s (-37.8%) vs the
starved stock run, moving llama from 34.5% to 41.3% of vLLM decode. Larger
budgets help less; at light/moderate concurrency the budget is net-negative
for TTFT because this all-at-once workload has no in-flight decode to protect
at t=0. Documented honestly: a real but narrow high-concurrency lever, not a
gap-closer (vLLM still ~2.4x decode / ~12x lower TTFT at npl128).

Assisted-by: Claude:opus-4.8 [Claude Code]
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
2026-06-23 21:22:07 +00:00
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