---

name: clone-repos description: Clone SGLang, FlashInfer repositories from GitHub to tmp/. Use when setting up the project, preparing for kernel extraction, or when the user needs the source repositories.

Clone Repositories

Clone SGLang, FlashInfer repositories from GitHub to the tmp/ directory.

Description

This skill sets up the required repositories for kernel extraction and testing workflows. It:

1. Clones SGLang and FlashInfer repositories to tmp/ directory (if not already present) with all submodules
2. Updates repositories by pulling latest changes from remote and updating submodules (if repos already exist)
3. Checks out the main branch by default (or specified branch)
4. Installs both packages from source in the current environment

Repositories:

• SGLang: Inference engine with model implementations and kernel calls
• FlashInfer: GPU kernel library with optimized implementations (ground truth)

Note: The flashinfer_trace/ directory is part of this repository and requires no cloning.

Usage

Copy# Clone all repos to ./tmp directory, update if exists, and install from source
/clone-repos

# Clone specific branches
/clone-repos --sglang-branch v0.4.0 --flashinfer-branch v0.2.0

Parameters

• sglang_branch (optional): SGLang branch to checkout (default: "main")
• flashinfer_branch (optional): FlashInfer branch to checkout (default: "main")

Implementation Steps

When executing this skill:

1. Create tmp directory if needed:

   Copymkdir -p tmp
   

2. Handle SGLang repository:

   Copy# Check if repo exists
   if [ -d "tmp/sglang/.git" ]; then
       echo "SGLang exists, pulling latest changes..."
       (cd tmp/sglang && git fetch origin && git checkout "${sglang_branch:-main}" && git reset --hard "origin/${sglang_branch:-main}" && git submodule update --init --recursive)
   else
       echo "Cloning SGLang with submodules..."
       git clone --recurse-submodules https://github.com/sgl-project/sglang.git tmp/sglang
       (cd tmp/sglang && git checkout "${sglang_branch:-main}")
   fi
   

   Note: Using (cd ...) subshell syntax ensures directory changes are isolated and don't affect subsequent commands.

3. Handle FlashInfer repository:

   Copy# Check if repo exists
   if [ -d "tmp/flashinfer/.git" ]; then
       echo "FlashInfer exists, pulling latest changes..."
       (cd tmp/flashinfer && git fetch origin && git checkout "${flashinfer_branch:-main}" && git reset --hard "origin/${flashinfer_branch:-main}" && git submodule update --init --recursive)
   else
       echo "Cloning FlashInfer with submodules..."
       git clone --recurse-submodules https://github.com/flashinfer-ai/flashinfer.git tmp/flashinfer
       (cd tmp/flashinfer && git checkout "${flashinfer_branch:-main}")
   fi
   

   Note: Using (cd ...) subshell syntax ensures directory changes are isolated and don't affect subsequent commands.

4. Install packages from source:

   Copy# Upgrade pip once
   pip install --upgrade pip
   
   # Install FlashInfer (pyproject.toml in repo root)
   (cd tmp/flashinfer && python -m pip install --no-build-isolation -e . -v)
   
   # Install SGLang (pyproject.toml in python/ subdirectory)
   (cd tmp/sglang && pip install -e "python")
   

   Note: Subshell syntax (cd ... && command) keeps working directory unchanged.

5. Verify installations:

   Copy# Test imports
   python -c "import sglang; print(f'SGLang: {sglang.__version__}')"
   python -c "import flashinfer; print(f'FlashInfer: {flashinfer.__version__}')"
   
   # Verify directory structure
   ls tmp/sglang/python/sglang/srt/models/
   ls tmp/flashinfer/flashinfer/
   ls tmp/flashinfer/tests/
   ls flashinfer_trace/definitions/
   

Output Directory Structure

Copyflashinfer-bench/
├── flashinfer_trace/                 # Local (already in project)
│   ├── definitions/                  # Kernel definitions
│   │   ├── rmsnorm/
│   │   ├── gemm/
│   │   ├── gqa_paged/
│   │   ├── mla_paged/
│   │   └── moe/
│   ├── workloads/                    # Workload configurations
│   └── tests/
│       └── references/               # Reference tests
└── tmp/                              # Cloned repositories (auto-updated)
    ├── sglang/                       # SGLang repository (installed in current env)
    │   └── python/sglang/srt/
    │       ├── models/               # Model implementations
    │       │   ├── llama.py
    │       │   ├── deepseek_v3.py
    │       │   ├── qwen2_moe.py
    │       │   └── ...
    │       └── layers/               # Layer implementations
    │           ├── attention/
    │           ├── moe/
    │           └── layernorm.py
    └── flashinfer/                   # FlashInfer repository (installed in current env)
        ├── flashinfer/               # Python package in root (not python/ subdir!)
        │   ├── attention.py
        │   ├── norm.py
        │   ├── moe.py
        │   └── ...
        ├── tests/                    # Reference tests with vanilla implementations
        ├── csrc/                     # CUDA source files
        └── include/                  # C++ headers with kernel implementations

Requirements

• Git (with submodule support)
• Network access to GitHub (for sglang, flashinfer, and their submodules)
• Sufficient disk space (~5GB total including submodules)
• Python development environment for building from source
• CUDA toolkit (for FlashInfer CUDA kernels)

Common Issues

• Network errors: Check GitHub connectivity; repositories with submodules require stable connection
• Submodule failures: Retry git submodule update --init --recursive
• Disk space: Requires ~5GB total for both repositories with submodules
• Installation failures: Verify Python ≥3.8, CUDA toolkit installed, and submodules initialized

Integration with Other Skills

This skill provides the foundation for:

1. extract-kernel-definitions: Uses SGLang model files to extract kernels, outputs to ./flashinfer_trace/definitions/
2. add-reference-tests: Uses FlashInfer for ground truth, outputs tests to ./flashinfer_trace/tests/references/

Example workflow:

Copy# Step 1: Clone SGLang and FlashInfer repositories
/clone-repos

# Step 2: Extract kernel definitions from a model
/extract-kernel-definitions --model-name deepseek_v3

# Step 3: Add reference tests
/add-reference-tests --op-type mla_paged

Notes

• Updates existing repos or performs full clones with submodules
• Editable installs (pip install -e) for development
• FlashInfer package location: tmp/flashinfer/flashinfer/ (not in python/ subdirectory)

Maintaining This Document

Update this file when changing repository URLs, directory structure, or adding new repositories.

See Also

• extract-kernel-definitions
• add-reference-tests