Environment Modules

Definition

Environment Modules provide the dynamic modification of a user's environment via modulefiles.
On Euler there are Modules based on Lua.

Documentation

https://lmod.readthedocs.io/en/latest/index.html

Command	Explanation
module list	List currently loaded modules.
module avail	List available modules.
module load package1 package2 ...	Load packages.
module unload package1 package2 ...	Unload packages.
module swap package1 package2	Swap package1 for package2.
module purge	Unload all modules.
module reset	Reset to the initial set of modules.
module overview	Provides a concise list of available modules.
module help packageName	Display help message for package.
module help	List all the commands that module knows about.
module spider	Searches the entire list of possible modules. The difference between “module avail” and “module spider” is explained in the “Module Hierarchy” and “Searching for Modules” section.
module show	Shows the functions such as setenv() or prepend_path() but nothing else.

Modules on Euler

The modules on Euler are organized in multiple stacks. The content of each stack is listed in "Euler applications and libraries ubuntu". Prefer newer over older stacks.
Each stack contains 3 hierarchical layers:

• The core layer contains all modules which only depend on the core compiler.
• The compiler layer contains all modules which depend on a particular compilers, but not on any MPI library.
• The MPI layer contains modules that depend on a particular combination of a compiler and a MPI library.

The consequence of hierarchical layers is that it's impossible to have two different versions of the same module loaded at the same time, or to mix compilers and MPI libraries. This helps to avoid environment misconfigurations.
To explore stacks, use module avail.