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docs(comfyui): the GTT aperture is not free RAM beside frank-dragoon

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Measured 2026-10-21 with frank-dragoon live: MemAvailable 15.3 GiB,
iGPU busy 1.75 GiB. The Qwen-Image weight sets (13.3-14.2 GB) do not
fit that budget, and the page's 122 GB /system_stats figure is the
aperture, not headroom. Adds the fit table and the
stop-mask-render-verify procedure (the 3090 bench law, applied to the
APU); ComfyUI.md gotcha links it.
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Frank
2026-10-21 13:35:50 -07:00
parent cb86ad8fd7
commit e6fcf217b4
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serverAppConfigs-docs/Dankclaw/ComfyUI Qwen-Image Workflows.md
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@@ -110,9 +110,9 @@ only `models`, `input`, `output`, `custom_nodes` and the healthcheck file
## Recommended additions
Quantized preferred, sized for the 8060S iGPU (GTT-backed — `/system_stats`
reports 122.4 GB of device VRAM on `cuda:0`, `curl http://127.0.0.1:8188/system_stats`
2026-10-18; the RTX 3090 is frank-zealot's). All repos verified 2026-10-05 and
Quantized preferred. The iGPU's GTT aperture is not free RAM beside
frank-dragoon — size every pick against *What actually fits beside
frank-dragoon* below (the RTX 3090 is frank-zealot's). All repos verified 2026-10-05 and
all four still resolve today (`huggingface.co/lightx2v/Qwen-Image-Lightning`
`huggingface.co/unsloth/Qwen-Image-Edit-2511-GGUF`
`huggingface.co/Comfy-Org/Qwen-Image-DiffSynth-ControlNets`
@@ -133,8 +133,34 @@ sha256 checks) or a plain `hf download` with the token in the environment —
never on the command line.
Skip list: the original `city96/Qwen-Image-gguf` conversions (superseded by
the 2.1 files already on disk), and any BF16 of #2/#4 (the iGPU does not need
them at GTT capacity, and they double the disk bill).
the 2.1 files already on disk), and any BF16 of #2/#4 — they double the disk
bill, and see *What actually fits beside frank-dragoon* for why raw GTT size
is not the real budget.
## What actually fits beside frank-dragoon
The 122 GB `/system_stats` figure is the GTT **aperture**, not free memory: on
an APU the aperture and `MemAvailable` are the same physical RAM, and
frank-dragoon pins tens of GiB of it. Measured 2026-10-21 with frank-dragoon
live: `MemAvailable` 15.3 GiB, iGPU busy 1.75 GiB — ComfyUI itself idles at
~10 MB, so the budget for a generation run is roughly what `free` says.
Weights must land inside that budget with slack for compute buffers and
activations (the mmproj-class lesson: price a model at ~1.5× its file set):
| Pipeline (weights) | Fits beside frank-dragoon? |
|---|---|
| Qwen-Image 2.1 int8_convrot + w4a8 + bf16 VAE (~14.2 GB) — the two proven workflows | **No** — thrash-or-fail; do not queue it while the endpoint serves |
| GGUF Q8_0 + w4a8 + small VAE (~13.3 GB) | No, same reason |
| Any BF16 combination | No |
| SDXL-Turbo / SD 1.5-class (~2–7 GB) | Yes, with real headroom |
**The law: one process owns the memory — same rule as the 3090 bench law.**
For a Qwen-Image render: stop and mask frank-dragoon
(`sudo systemctl stop frank-dragoon` + `mask` — the mask stops
`Restart=always` from firing mid-render), generate, unmask, verify
`curl 192.168.0.143:7770/health`. The proven workflows above then run with
the whole machine. Do not treat `/system_stats`'s 122 GB as an invitation.
## See Also
serverAppConfigs-docs/Dankclaw/ComfyUI.md
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@@ -129,6 +129,12 @@ bind-mounted to `/usr/local/bin/comfyui-healthcheck.py` and run as `HealthCmd`
- Do not let pip reinstall the torch family. The Containerfile filters it out on purpose.
- The base image is about 32 GiB (`podman image inspect localhost/comfyui-rocm:gfx1151` → 33,765,227,471 B ≈ 31.4 GiB, 2026-10-18). A code update means a rebuild, because the code is baked in.
- The empty-models note from the 2026-09-16 era is retired: `/home/dank/comfyui-data/models` now holds the Qwen-Image 2.1 payload — three `diffusion_models`, three `text_encoders`, two VAEs (~35 GB, `ls -l` 2026-10-18), listed in [[ComfyUI Qwen-Image Workflows]]. New model classes (LoRA, ControlNet) still need their directories created first: `models/lora` and `models/controlnet` do not exist yet.
- **The 122 GB `/system_stats` VRAM figure is the GTT aperture, not free
memory.** On the APU it is system RAM, and frank-dragoon pins most of it
(`MemAvailable` 15.3 GiB with the endpoint live, measured 2026-10-21). A
Qwen-Image-class render beside the running endpoint is thrash-or-fail; the
stop-mask-render-verify procedure and the fit table are in
[[ComfyUI Qwen-Image Workflows]] → What actually fits beside frank-dragoon.
## See Also