Comfy UI

Verify system prerequisites

Check that your NVIDIA DGX Spark device meets the requirements before proceeding with installation.

python3 --version
pip3 --version
nvcc --version
nvidia-smi

Expected output should show Python 3.8+, pip available, CUDA toolkit, and GPU detection.

Create Python virtual environment

You will install ComfyUI on your host system, so you should create an isolated environment to avoid conflicts with system packages.

python3 -m venv comfyui-env
source comfyui-env/bin/activate

Verify the virtual environment is active by checking the command prompt shows (comfyui-env).

Install PyTorch with CUDA support

Install PyTorch with CUDA 13.0 support.

pip3 install torch torchvision --index-url https://download.pytorch.org/whl/cu130

This installation targets CUDA 13.0 compatibility with Blackwell architecture GPUs.

Clone ComfyUI repository

Download the ComfyUI source code from the official repository.

git clone https://github.com/comfyanonymous/ComfyUI.git
cd ComfyUI/

Install ComfyUI dependencies

Install the required Python packages for ComfyUI operation.

pip install -r requirements.txt

This installs all necessary dependencies including web interface components and model handling libraries.

Download Stable Diffusion checkpoint

Navigate to the checkpoints directory and download the Stable Diffusion 1.5 model.

cd models/checkpoints/
wget https://huggingface.co/Comfy-Org/stable-diffusion-v1-5-archive/resolve/main/v1-5-pruned-emaonly-fp16.safetensors
cd ../../

The download will be approximately 2GB and may take several minutes depending on network speed.

Launch ComfyUI server

Start the ComfyUI web server with network access enabled.

python main.py --listen 0.0.0.0

The server will bind to all network interfaces on port 8188, making it accessible from other devices.

Validate installation

Check that ComfyUI is running correctly and accessible via your web browser.

curl -I http://localhost:8188

Expected output should show HTTP 200 response indicating the web server is operational.

Open a web browser and navigate to http://<SPARK_IP>:8188 where <SPARK_IP> is your device's IP address.

Optional - Cleanup and rollback

If you need to remove the installation completely, follow these steps:

deactivate
rm -rf comfyui-env/
rm -rf ComfyUI/

To rollback during installation, press Ctrl+C to stop the server and remove the virtual environment.

Optional - Next steps

Test the installation with a basic image generation workflow:

1. Access the web interface at http://<SPARK_IP>:8188
2. Load the default workflow (should appear automatically)
3. Click "Run" to generate your first image
4. Monitor GPU usage with nvidia-smi in a separate terminal

The image generation should complete within 30-60 seconds depending on your hardware configuration.