Julia

We provide Julia, including a variety of packages. To use the current version, do

module load julia

Once you’ve loaded Julia, the version number will be available in the JULIA_VERSION environment variable.

Packages¶

Julia packages provided by the system¶

To see what Julia packages are installed on the system, you can run

ls /usr/local/linux/julia-${JULIA_VERSION}/share/julia/packages

To see what Julia packages are directly available for loading (via using or import) through our system project, you can run

cat /usr/local/linux/julia-1.10.4/share/julia/environments/v1.10/Project.toml

(modifying the version numbers as need for other Julia versions). We’re happy to install additional packages system-wide, particularly if they seem like they would be useful to multiple people. Just email us.

For packages not available through the system project (see above), you need to add the packages to your Julia project (which might simply be the default project in ~/.julia/environments/v1.10) using Pkg.add as described below. Packages installed on the system won’t be reinstalled (unless there is a newer version available than the one we installed); they’ll simply be associated with your project.

Install Julia packages into your account¶

You can also install additional packages into your own account. Packages are associated with Julia projects. You can view your current project with Base.active_project() and activate a project using Pkg.activate().

Here is an example of installing the GaussianMixtures package for your current project:

using Pkg
Pkg.add("GaussianMixtures")
using GaussianMixtures

By running the ‘using’ command immediately, Julia will precompile the package.

Note that if the current version of GaussianMixtures were already installed at the system level, Julia won’t reinstall it, but will simply make the system-installed package available in your current project.

Versions¶

You can use Linux environment modules to switch between different Julia versions. This can be done on a one-time basis in a given terminal session or cluster submission script, or can be done in your .bashrc (after the stanza involving ~skel/std.bashrc) to set a default different than the system default.

To switch from Julia 1.10.4 (the default) to Julia 1.8:

module switch julia/1.10.4 julia/1.8

To see what Julia is being used:

module list