sglang-serving

Launch and tune SGLang servers with constrained decoding and RadixAttention.

17|3|Updated Apr 3, 2026
One-click install
npx skills add https://github.com/jayll1303/AIEKit --skill sglang-serving
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: sglang-serving
Source: https://github.com/jayll1303/AIEKit/tree/main/.kiro/skills/sglang-serving
Command: npx skills add https://github.com/jayll1303/AIEKit --skill sglang-serving

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Deploying and tuning LLM inference servers that require structured outputs, shared-prefix caching, and multi-GPU scaling is complex and error-prone. This skill consolidates launch patterns, performance tuning, and diagnostics for SGLang Runtime to reliably serve constrained JSON/regex/EBNF outputs, enable RadixAttention prefix caching, and run quantized models in production.

Core Features & Use Cases

  • Server Launch & Configuration: Examples and recommended flags for launching sglang.launch_server with model-path, port, tensor parallelism (tp), mem-fraction, and chunked prefill.
  • RadixAttention & Prefix Caching: Strategies and monitoring tips for maximizing throughput on shared-prefix workloads such as long system prompts and few-shot examples.
  • Structured Output: Native constrained decoding via json_schema, regex, and EBNF for always-valid JSON, format-constrained responses, and grammar-enforced outputs.
  • Quantized & Multi-GPU Serving: Guidance for serving FP8, AWQ, GPTQ models, TP/DP configurations, and recommendations to avoid OOM and NCCL/NVLink pitfalls.
  • Diagnostics & Tuning: Procedures for VRAM estimation, cache hit monitoring, chunked prefill sizing, TP requirements, and resolving model load failures.
  • Use Case Example: Serve a user-profile JSON API that enforces a schema and scales across GPUs using RadixAttention to accelerate many clients sharing the same system prompt.

Quick Start

Launch an SGLang server for meta-llama/Llama-3.1-8B-Instruct on port 30000 and verify the /v1/models endpoint returns the model list.

Frequently Asked Questions about sglang-serving

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I serve LLMs with structured JSON or regex constrained decoding?▼

Serve LLMs with structured constrained decoding using native json_schema, regex, and EBNF formats to enforce always-valid JSON and grammar-constrained responses. This ensures format-constrained outputs directly during high-throughput inference.

How does RadixAttention prefix caching improve LLM inference throughput?▼

RadixAttention prefix caching improves LLM inference throughput by storing and reusing computations for shared-prefix workloads like long system prompts and few-shot examples. This maximizes throughput when many clients share identical context prefixes.

What's the best way to configure tensor parallelism for multi-GPU LLM serving?▼

Configure tensor parallelism for multi-GPU LLM serving by setting tp and dp flags during server launch. This scales inference across GPUs while avoiding NCCL/NVLink pitfalls and OOM errors through recommended mem-fraction tuning and VRAM estimation.

Can I serve quantized FP8, AWQ, and GPTQ models with SGLang?▼

You can serve quantized FP8, AWQ, and GPTQ models with SGLang to reduce memory footprint. The runtime provides specific guidance for quantized model serving scenarios to ensure stable multi-GPU deployment without OOM errors.

Why does my LLM inference server run out of memory or fail to load models?▼

LLM inference servers run out of memory or fail to load models due to incorrect mem-fraction sizing or TP requirements. Diagnose OOM errors and model load failures using provided VRAM estimation procedures and chunked prefill tuning recommendations.

How do I launch an OpenAI-compatible API server for Llama models?▼

Launch an OpenAI-compatible API server for Llama models using sglang.launch_server with model-path and port flags. Verify the /v1/models endpoint returns the model list to confirm successful deployment of the high-throughput runtime.