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Managing multiple CUDA versions using environment modules in Ubuntu
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Steps_multiple_cuda_environments.md

Steps to manage multiple CUDA environments

This gist contains all the steps required to:

  • Install multiple CUDA versions (e.g., CUDA 11.3 and CUDA 11.8).
  • Manage multiple CUDA environments on Ubuntu using the utility called environment modules.
  • Use this approach to avoid CUDA environment conflicts.

Environment Modules is a package that provides for the dynamic modification of a user's environment via modulefiles. You can find more on it at https://modules.readthedocs.io/en/latest/

1. Install the Compatible NVIDIA Drivers (if required)

  • Add PPA GPU Drivers Repository to the System

    sudo add-apt-repository ppa:graphics-drivers/ppa

  • Check GPU and available drives

    ubuntu-devices drivers

  • Install the compatible driver

    # in my case it is nvidia-driver-530
sudo apt install nvidia-driver-530

  • Check the installed NVIDIA driver

    nvidia-detector

Note:

  • You can also auto-install the compatible driver using sudo ubuntu-drivers autoinstall.
  • Additionally, you can also install NVIDIA drivers using the Software & Updates Ubuntu app. Just go to the Additional Drivers tab, choose a driver, and click Apply Changes.

2. Install CUDA 11.3 and CUDA 11.8

  • Go to the https://developer.nvidia.com/cuda-toolkit-archive and select CUDA Toolkit 11.3 from the available options.

  • Choose your OS, architecture, distribution, version, and installer type. For example, in my case:

    Option value
    OS Linux
    Architecture x86_64
    Distribution Linux
    Version 20.04
    Installer type deb(local)

  • Follow the provided installation instructions by copying and pasting the commands into your terminal. This will install CUDA 11.3. Use the following commands:

    wget https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64/cuda-ubuntu2004.pin
sudo mv cuda-ubuntu2004.pin /etc/apt/preferences.d/cuda-repository-pin-600
wget https://developer.download.nvidia.com/compute/cuda/11.3.0/local_installers/cuda-repo-ubuntu2004-11-3-local_11.3.0-465.19.01-1_amd64.deb
sudo dpkg -i cuda-repo-ubuntu2004-11-3-local_11.3.0-465.19.01-1_amd64.deb
sudo apt-key add /var/cuda-repo-ubuntu2004-11-3-local/7fa2af80.pub
sudo apt-get update
sudo apt-get -y install cuda

  • Similarly, install CUDA 11.8 using the following commands:

    wget https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64/cuda-ubuntu2004.pin
sudo mv cuda-ubuntu2004.pin /etc/apt/preferences.d/cuda-repository-pin-600
wget https://developer.download.nvidia.com/compute/cuda/11.8.0/local_installers/cuda-repo-ubuntu2004-11-8-local_11.8.0-520.61.05-1_amd64.deb
sudo dpkg -i cuda-repo-ubuntu2004-11-8-local_11.8.0-520.61.05-1_amd64.deb
sudo cp /var/cuda-repo-ubuntu2004-11-8-local/cuda-*-keyring.gpg /usr/share/keyrings/
sudo apt-get update
sudo apt-get -y install cuda

  • Make sure to copy and execute the commands above in your terminal to install CUDA 11.3 and CUDA 11.8 on your system.

3. Install cuDNN library

  • Go to https://developer.nvidia.com/cudnn and download the cuDNN library for CUDA 11.x. Note that you might need to create a developer's account first.

  • Untar the downloaded file using the following command:

    tar -xvf cudnn-linux-x86_64-8.9.2.26_cuda11-archive.tar.xz

  • Copy the cuDNN files to the CUDA toolkit files:

    # for CUDA 11.3
sudo cp include/cudnn*.h /usr/local/cuda-11.3/include
sudo cp lib64/libcudnn* /usr/local/cuda-11.3/lib64

# for CUDA 11.8
sudo cp include/cudnn*.h /usr/local/cuda-11.8/include
sudo cp lib64/libcudnn* /usr/local/cuda-11.8/lib64

  • Make the files executable:

    sudo chmod a+r /usr/local/cuda-11.3/include/cudnn*.h /usr/local/cuda-11.3/lib64/libcudnn*
sudo chmod a+r /usr/local/cuda-11.8/include/cudnn*.h /usr/local/cuda-11.8/lib64/libcudnn*

Note: Strictly speaking, you are done with the CUDA setup. You can use it by adding the CUDA bin and library path to the PATH and LD_LIBRARY_PATH environment variables. For example, you can set up CUDA 11.8 by adding the following lines in the ~/.bashrc:

PATH=/usr/local/cuda-11.3/bin:$PATH
LD_LIBRARY_PATH=/usr/local/cuda-11.8/extras/CUPTI/lib64:$LD_LIBRARY_PATH
LD_LIBRARY_PATH=/usr/local/cuda-11.8/lib64:$LD_LIBRARY_PATH

Similarly, you can set up CUDA 11.3. However, manually changing the paths every time can be cumbersome!

4. Manage multipe CUDA versions using environment modules

a) Install the environment modules utility:

  • Run the following commands: 
        sudo apt-get update
    sudo apt-get install environment-modules
  • Check the installation: 
    # Check the installation by running
module list

You should see a list of default installed modules like git and maybe their versions displayed when you run the command module list. This confirms that the environment modules utility has been successfully installed on your system.

b) Create modulefiles for CUDA distributions

Note: You might need root permissions to create directories and files. Use sudo in that case.

  • Create a directory /usr/share/modules/modulefiles/cuda to hold modulefiles for cuda distributions

    sudo mkdir -p /usr/share/modules/modulefiles/cuda

  • Create a modulefile /usr/share/modules/modulefiles/cuda/11.3 for CUDA 11.3 and add the following lines:

    #%Module1.0
##
## cuda 11.3 modulefile
##

proc ModulesHelp { } {
    global version
    
    puts stderr "\tSets up environment for CUDA $version\n"
}

module-whatis "sets up environment for CUDA 11.8"

if { [ is-loaded cuda/11.8 ] } {
module unload cuda/11.8
}

set version 11.3
set root /usr/local/cuda-11.3
setenv CUDA_HOME	$root

prepend-path PATH $root/bin
prepend-path LD_LIBRARY_PATH $root/extras/CUPTI/lib64
prepend-path LD_LIBRARY_PATH $root/lib64
conflict cuda

  • Similarly, create a modulefile /usr/share/modules/modulefiles/cuda/11.3 for CUDA 11.3 and add the following lines:

    #%Module1.0
##
## cuda 11.8 modulefile
##

proc ModulesHelp { } {
    global version
    
    puts stderr "\tSets up environment for CUDA $version\n"
}

module-whatis "sets up environment for CUDA 11.8"

if { [ is-loaded cuda/11.3 ] } {
module unload cuda/11.3
}

set version 11.8
set root /usr/local/cuda-11.8
setenv CUDA_HOME	$root

prepend-path PATH $root/bin
prepend-path LD_LIBRARY_PATH $root/extras/CUPTI/lib64
prepend-path LD_LIBRARY_PATH $root/lib64
conflict cuda

c) Make CUDA 11.8 the default cuda version

  • Create a file /usr/share/modules/modulefiles/cuda.version to make CUDA 11.8 the default cuda module: 
    #%Module
set ModulesVersion 11.8

Note: make sure to reload your terminal.

5. Changing and Viewing the CUDA Module

  • To change and view the loaded CUDA module, you can use the following commands: 
    # Check the currently loaded module
module list
# Check the available modules
module avail

# Load a specific cuda version
module load cuda/11.3
# Unload the currently loaded CUDA module
module unload cuda
# Load CUDA 11.8
module load cuda/11.8

# verify the paths of the loaded CUDA
nvcc --version # should give the loaded CUDA version
echo $CUDA_HOME
echo $PATH
echo $LD_LIBRARY_PATH

Note: You can add additional CUDA versions or other packages by creating corresponding modulefiles and following the steps outlined in this gist.

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