BBuf/sglang-llama4-optimization
skills/model-optimization/sglang/sglang-llama4-optimization/SKILL.md
PR-backed optimization manual for Llama 4 in SGLang. Use when an engineer needs to audit, debug, extend, or document Llama4 text and multimodal runtime, FP8/FP4 quantization, router behavior, long-context attention, and Eagle support.
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SKILL.md
- name:
- sglang-llama4-optimization
- description:
- PR-backed optimization manual for Llama 4 in SGLang. Use when an engineer needs to audit, debug, extend, or document Llama4 text and multimodal runtime, FP8/FP4 quantization, router behavior, long-context attention, and Eagle support.
SGLang Llama 4 Optimization
Overview
This skill covers Llama4 text and multimodal runtime, FP8/FP4 quantization, router behavior, long-context attention, and Eagle support.
Evidence snapshot:
- SGLang mainline checked around
c122d343adb969cd9bbd1af2ca86727a11be3845 - sgl-cookbook checked around
e88b0fd8ac5b1caa6eb42766035029220053369b - Canonical PR notes:
references/pr-history.md - History mirrors:
model-pr-optimization-history/sglang/llama4/README.zh.mdandREADME.en.md
Non-Negotiable Evidence Rule
Use skills/model-optimization/model-pr-diff-dossier/SKILL.md as the production bar.
Every PR cited for this family must be based on diff reading, not only PR titles.
Runtime Surfaces
sglang/python/sglang/srt/models/llama4.pysglang/python/sglang/srt/models/mllama4.py
Current Main Summary
- Llama4 is mature on the SGLang side but still sensitive to quantized MoE and long-context backend selection.
- The multimodal path adds a separate vision-rotary and processor validation surface.
Key Landed PRs
- #5092
Add Llama4 support: Initial Llama4 landing in SGLang. - #5194
Support Llama4 fp8 inference: Enabled the first production quantized lane. - #6162
Fix Llama4 gibberish output with long context and CUDA graph: Closed a major correctness bug. - #7129
Enable ModelOpt Llama4 fp8 checkpoint deployment in SGLang: Added the ModelOpt checkpoint path. - #13421
Add Llama4 attention backend auto-selection: Stabilized backend choice for real deployments.
Validation Lanes
- Startup on the cookbook checkpoint or example route.
- Re-run the parser, quantization, or multimodal lane that matches this family.
- Re-check registered or manual tests after touching loader or processor code.
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