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feat(fv-ml1): rebalance GPUs 0/1 by usage; contexts to published maximums; gen-small default output cap

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Layout: GPU 0 = cyberprev (KV 16 -> 15 GiB, 1.29x), erp-seat (moved from
GPU 1, KV 8.49 -> 5.5 GiB, 1.32x), voices (ctx 8,192 -> 40,960, its native
maximum, KV 6 GiB, 1.07x), coder (moved from GPU 1, ctx 16,384 -> 32,768,
the card maximum, 2.35x), parakeet-nemo. GPU 1 = gen-small (moved from
GPU 0, 5.5 GiB, 1.76x), meromero-rp (22 GiB, 1.32x), intern-decision.

Sizing rule: KV >= 1.25x max context rounded up to 0.5 GiB, checked against
7 days of LiteLLM traffic and the engines' own KV-usage logs. Each card keeps
spare memory for its bursty tenant (parakeet's cap on GPU 0, intern-decision's
32k call on GPU 1). YaRN extensions are not enabled: they do not fit, and the
Qwen cards warn static YaRN degrades short prompts.

gen-small gets --override-generation-config max_new_tokens 32768. It applies
only to requests that omit max_tokens (vLLM get_max_tokens) and answers 9
runaway ~260k-token replies in 7 days; the longest normal reply was 6,357.

Applied with playbooks/fv-ml1-rebalance-20261005.yaml (boot-check guard and
health/KV verification per seat); all nine seats healthy, gateway smoke
tests pass.
This commit is contained in:
vh
2026-10-05 22:51:17 -07:00
parent 6851ecbd0b
commit c35f6510bf
15 changed files with 319 additions and 25 deletions
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stacks/gen-small-seat/.env.example
+4 -3
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@@ -1,12 +1,13 @@
# gen-small-seat — Qwen3.6-35B-A3B Heretic (llmfan46), fv-ml1 GPU 0, :8026.
# gen-small-seat — Qwen3.6-35B-A3B Heretic (llmfan46), fv-ml1 GPU 1 (since 2026-10-05), :8026.
# Copy to .env on the host at /opt/docker/compose/gen-small-seat/.env.
GEN_SMALL_IMAGE=vllm/vllm-openai:nightly-e9d1398d9edfd90fcc1cf783805240e3effec013
API_KEY=
# ── Placement ── shares GPU 0 with cyberprev (sec). KV pinned in bytes so the two
# ── Placement ── shares its card with other seats. KV pinned in bytes so the two
# co-resident seats don't fight over a util fraction.
GEN_SMALL_GPU_ID=0
# 2026-10-05 rebalance: moved to GPU 1 (with meromero-rp and intern-decision).
GEN_SMALL_GPU_ID=1
GEN_SMALL_PORT=8026
GEN_SMALL_CONTAINER_NAME=vllm-gen-small