Large Memory Computing


Anaconda provides Python, R and other packages for scientific computing including data sciences, machine learning, etc.

Anaconda Modules

There are several anaconda modules available on Oscar. To list all anaconda modules, run module avail anaconda. The anaconda/3-5.2.0 module is recommended.

$ module avail anaconda
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ name: anaconda*/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
anaconda/2-4.3.0 anaconda/2020.02 anaconda/3-5.2.0
anaconda/2-5.3.0 anaconda/3-4.3.0

Do not activate a conda environment before submitting a batch job if the batch job activates a conda environment. Otherwise, the batch job will not be able to activate the conda environment and hence fail.


This is the newest anaconda module on Oscar. The first time you load the anaconda/2020.02 module, you need initialize the environment by running the following command:

$conda init bash
no change /gpfs/runtime/opt/anaconda/2020.02/condabin/conda
no change /gpfs/runtime/opt/anaconda/2020.02/bin/conda
no change /gpfs/runtime/opt/anaconda/2020.02/bin/conda-env
no change /gpfs/runtime/opt/anaconda/2020.02/bin/activate
no change /gpfs/runtime/opt/anaconda/2020.02/bin/deactivate
no change /gpfs/runtime/opt/anaconda/2020.02/etc/profile.d/
no change /gpfs/runtime/opt/anaconda/2020.02/etc/fish/conf.d/
no change /gpfs/runtime/opt/anaconda/2020.02/shell/condabin/Conda.psm1
no change /gpfs/runtime/opt/anaconda/2020.02/shell/condabin/conda-hook.ps1
no change /gpfs/runtime/opt/anaconda/2020.02/lib/python3.7/site-packages/xontrib/conda.xsh
no change /gpfs/runtime/opt/anaconda/2020.02/etc/profile.d/conda.csh
modified /users/yliu385/.bashrc
==> For changes to take effect, close and re-open your current shell. <==

Do not load the module in your .modules or .bashrc file. Otherwise, your VNC session cannot start.


If you load the module in your .modules or .bashrc file, you may need to have the following lines in your .bashrc as well to be able to start a VNC session:




Anaconda uses conda to install packages and manage their depenencies. You can use conda to manage conda environments. To access conda, you need to load an Anaconda module. For example,

module load anaconda/2020.02


module load anaconda/3-5.2.0

Conda Environment

A user may install all needed software packages for a project in a conda environment. A conda environment can be

  • shared among all users if the environment is installed in a shared directory

  • private to one user if the environment is installed in a user's private directory

The command 'conda info' shows important configurations for conda environment.

$ conda info
active environment : None
user config file : /users/yliu385/.condarc
populated config files :
conda version : 4.5.4
conda-build version : 3.10.5
python version :
base environment : /gpfs/runtime/opt/anaconda/3-5.2.0 (read only)
channel URLs :
package cache : /gpfs/runtime/opt/anaconda/3-5.2.0/pkgs
envs directories : /users/yliu385/anaconda
platform : linux-64
user-agent : conda/4.5.4 requests/2.18.4 CPython/3.6.5 Linux/3.10.0-957.5.1.el7.x86_64 rhel/7.3 glibc/2.17
UID:GID : 20175:601
netrc file : None
offline mode : False

Below are some important configurations:

  • envs directories: a list of directories where a conda environment is installed by default. In the output of 'conda info' above, the first default directory to install a conda environment is a $HOME/anaconda.

  • package cache: a list of directories where downloaded packages are stored.

Create a New Conda Environment

To create a new conda environment in a default directory, run the following command:

conda create -n conda_environment_name

To create a new conda environment in a different directory, run the following command:

conda create -p /path/to/install/conda_environment_name

Activate a Conda Environment

After creating a conda environment, users can activate a conda environment to install or access packages in the environment. The command is slightly different for different anaconda modules.

For the anaoconda/2020.02 module, users can activate an environment with the following command:

conda activate conda_environment_name

For the anaconda/3-5.2.0 module, users can activate an environment with the following command:

source activate conda_environment_name

The commands above will only work if:

  • A conda environment with the specified name (conda_environment_name in the example) exists

  • The appropriate anaconda module has been loaded (if you are unsure about this one, consult this documentation)

If you need to activate a conda environment in a bash script, you need to source the as shown in the following example bash script:

module load anaconda/2020.02
source /gpfs/runtime/opt/anaconda/2020.02/etc/profile.d/
conda activate my_env

If you are using anaconda/3-5.2.0, replace the instances of 2020.02 with 3-5.2.0.

After installing packages in an active environment (instructions below), you do not need to load or install those packages in the bash script; any packages installed in the conda environment (before the script even starts) will be available through the environment after it is activated (line 4 in the code above).

To deactivate a conda environment, simply use the following command:

conda deactivate

Install Packages in an Active Conda Environment

To install a package, we need to first activate a conda environment, and then run

conda install package_name=version

The "=version" is optional. By default, conda install a package from the anaconda channel. To install a package from a different channel, run conda install with the -c option. For example, to install a package from the conda_forge channel, run

conda install -c conda_forge conda_environment_name

Delete a Conda Environment

To delete a conda environment, run

conda remove -n conda_environment_name --all

Remove Caches

Conda may download lots of additional packages when installing a package. A user may use up all quota due to these downloaded packages. To remove the downloaded packges, run

conda clean --all