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feat(reward-seat): move Skywork reward seat from fv-ml1 to esh-ml1; audit finds nothing superseding it

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- Audit: Skywork-Reward-V2-Llama-3.1-8B is still #1 of 188 on AllenAI's
  RewardBench 2 per-sample results; no Skywork V3; the -40M sibling is
  vendor-marked experimental. Our AWQ W4A16 quant: 0.847 vs published bf16
  0.860 on a 150-prompt sample (within +/-2.9 pt SE), 96.2% pairwise
  agreement. Double BOS from vLLM on pre-templated text costs a further
  ~2.7 pts; callers must send add_special_tokens=false.
- No working consumer: 0 requests since 2026-09-13; Worldtree Domari points
  at a dead IP with a non-vLLM schema (reported to worldtree-dev).
- Move: sha256-identical model copy; vLLM v0.24.0 on esh-ml1 :8003 at 0.55
  util (KV 1.30x of a 16k request). Parity vs fv-ml1: 149/150 verdicts,
  99.8% pairwise signs, raw |delta| median 0.049.
- Gateway /scalar-judge passthrough -> 10.0.50.80:8003; fv-ml1 vllm-reward
  removed (~10.2 GB freed on GPU 1). stacks/vllm now holds only vllm-coder.
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vh
2026-09-25 09:09:48 -07:00
parent 7bdac80878
commit 52612cbe96
8 changed files with 207 additions and 72 deletions
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docs/pfi/fv-ml1-gpu-seat-inventory.md
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@@ -140,3 +140,7 @@ change. Run `--check` in CI to catch a stale document.*
> **2026-09-25:** `qwen3-embedding` (:8001) and `reranker` (:8013) LEFT fv-ml1 —
> their vLLM seats were retired and the names now route to TEI on esh-ml1
> (`stacks/embed-rerank`). ~6.1 GB freed on GPU 1.
> **2026-09-25:** `vllm-reward` (Skywork, :8003, `/scalar-judge`) also LEFT fv-ml1 for
> esh-ml1 (`stacks/reward-seat`); ~10.2 GB more freed on GPU 1 (93.1 → 77.8 GB used
> across the day). The per-seat entry above describing it is historical.