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Frank 5829a0bfe8 docs: rename docs/ -> serverAppConfigs-docs/ per system-wide PROJECTNAME-docs convention

All in-repo path references (AGENTS.md, README, old scripts, report artifacts,
test code paths) rewritten in the same commit; focused-test map extended for
.gitignore, old/scripts/*, dankclaw/comfyui/*, and report/* per this repo's
own convention ('add one before committing'). Obsidian wikilinks are
title-based and unaffected.

2026-08-28 02:20:06 -07:00

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Lemonade and sd.cpp

Why Lemonade Server can do image generation on Strix Halo when ComfyUI cannot. Research from the Lemonade source repo (lemonade-sdk/lemonade, cloned 2026-08-14) and live verification.

The short answer

Lemonade does not run ComfyUI. Its image-generation backend is a wrapped stable-diffusion.cpp (leejet/stable-diffusion.cpp) subprocess. sd.cpp is a ggml-family native C++ runtime that ships its own HIP kernels — and those kernels include gfx1151. ComfyUI runs on PyTorch, whose standard wheels omit gfx1151. Same hardware, different runtime, different result.

From the Lemonade source

src/cpp/server/backends/sdcpp/sdcpp_server.cpp:

Image gen is SDServer, a WrappedServer around a prebuilt sd.cpp binary.
Downloads sd-<version>-bin-Linux-Ubuntu-24.04-x86_64-<backend>.zip from leejet/stable-diffusion.cpp releases.
Backends: cpu, cuda, metal, rocm, vulkan.
ROCm asset is ...-rocm-<version>.zip; Vulkan is ...-vulkan.zip.

Backend support matrix (serverAppConfigs-docs/dev/backends-reference.md):

Recipe	Backend	Device families
`sd-cpp`	rocm	amd_gpu (gfx103X, gfx110X, gfx1150, gfx1151, gfx1152, gfx120X)
`sd-cpp`	vulkan	amd_gpu; cpu; nvidia_gpu
`thenoise`	rocm	amd_gpu (gfx1150, gfx1151, gfx1152) — experimental

gfx1151 is explicitly supported by sd.cpp's ROCm build. There is also a dedicated experimental thenoise ROCm backend targeting exactly the Strix Halo archs.

Engine comparison

	ComfyUI	Lemonade (sd.cpp)
Runtime	PyTorch	native C++ (ggml family)
AMD path	needs PyTorch ROCm wheel with gfx1151 kernels — not in standard wheels	ships own HIP kernels, gfx1151 included
On Strix Halo	CPU only (today)	ROCm GPU, or Vulkan fallback
Interface	node graph web UI	server, OpenAI-style API, GUI/CLI

This mirrors llama.cpp on the same box: ggml-family runtimes ship their own gfx1151 HIP kernels and run on ROCm; PyTorch does not.

Relevance

If GPU image generation on Dankclaw matters, Lemonade (or bare sd.cpp) is the working path today.
ComfyUI's node graph is the cost of switching: Lemonade is not ComfyUI.
See ComfyUI ROCm and Vulkan for the PyTorch-side analysis showing a gfx1151-enabled torch would also make ComfyUI work.

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