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vllm-omni/probe/issue-2/deploy-fp8v.yaml
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probe: Qwen-Image conditioning-KV spill probe on RTX 3090 / RTX 5080 (issue 2)
Evidence-only change: probe kit (serve wrapper, API client, PSNR
comparator, offline fp8_v driver), per-host run summaries, and the
findings report. No code changes to the stack.

Verdicts: not-built on both cards. On the 3090 the served reference
ceiling is two condition images with the conditioning cache on
(2.2x the Diffusers nocache baseline, pair PSNR mean 27.57 dB);
four references OOM on the resident BF16 working set, not the KV
(~0.3 GiB/reference, per-request). On the 5080 the server cannot
initialize under any flag: init_parameters materializes the
unquantized skeleton on-device before quantization/offload engage.
Also documents that the recipe's deploy-YAML extras route for
prefix_kv_cache_dtype does not reach the served transformer on
8484d85d (offline Omni engine kwarg does).
2026-10-08 00:58:29 -04:00

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YAML

# Issue 2 probe: Qwen-Image-2.1 with FP8 V-only prefix-KV storage.
# Merged over the pipeline's declared single-stage topology; every other
# field falls back to StageDeployConfig defaults.
stages:
- stage_id: 0
engine_extras:
prefix_kv_cache_dtype: "fp8_v"