Installing ROOT in a Python Virtual Environment on LENGAU

1. Access LENGAU and Connect via SSH

• First, sign in to LENGAU and establish an SSH connection to the dtn node.

2. Initialize Conda (if needed)

• Ensure your base Conda environment is initialized:
  • If it is initialized, you should see (base) next to your user ID.
  • This means your .bashrc file has been modified to load Conda automatically.
• If Conda is not initialized, follow the steps in the CHPC Python Guide.

3. Prepare the Shell and Load Required Modules

• Purge any loaded modules and load the BIOMODULES module:

  module purge
  module add chpc/BIOMODULES
  

4. Create a New Conda Environment with ROOT

• Use the following command to create a new Conda environment named root_env with ROOT preinstalled:

  conda create -n root_env root -c conda-forge

• The installation time may vary; it typically takes 3–5 minutes.

5. Verify the Installation

• List all available environments to confirm the path to your new environment:

  conda info --envs

• Check if the ROOT package was installed by listing the installed packages

  conda list
  

6. Activate the ROOT Environment

• Activate the root_env environment using:

  conda activate root_env
  

7. Launch ROOT

• Start ROOT with the following command:

  root
  

8. Deactivate the Environment

• When done, deactivate the environment with:

  conda deactivate
  

This guide ensures a smooth installation of ROOT using a Conda-managed virtual environment on LENGAU. If you encounter any issues, feel free to reach out for support: [email protected]