The module system on Discovery includes many commonly used scientific software packages that you can load in your path when you need it and unload it when you no longer need it.
module avail command to show a list of the most currently available software on Discovery.
Some modules might conflict with each other, resulting in the software not behaving as expected.
Also, if there are multiple versions of software, and you load more than one version of the software,
only the latest version will be used. Use
module list to view the modules you currently have loaded in your path.
which command to display which version of a software package you have in your path.
which python will display the version of python that you have in your path.
The following are common module commands that are useful for interacting with software packages on Discovery.
||View a list of all of the available software packages on Discovery that you can load|
||Displays a list of the software packages currently loaded in your path|
||View the details of a software package (see the section “Module Show” below for more information)|
||Load a software package into your environment|
||Remove a single software package from your environment|
||Removes all of the loaded software packages from your environment.|
module purge will purge all modules from your environment, including the default module
This module contains the http proxy needed for nodes to have internet access.
If you accidentally purge this module, it will be automatically reloaded the next time you log out and
log back in again. You can also load it manually if you have purged it by using the
module load command.
Module show example¶
Before loading a module, type
module show <name of module> to see if there are any dependencies or commands that you need to execute
before loading the module. In some cases, a module might depend on having other modules loaded to work as expected. While modules are a convenient
way of loading software to use on Discovery, scientific software can come with many packages and dependencies. In addition to module, you should review
other ways of loading software on Discovery. See Software overview for more information on different ways you can install software on Discovery.
The figure below shows an example of
module show with the software package called amber.
Module load and unload example¶
In the figure below, the software module stata/15 was loaded and then unloaded. After loading and unloading, module list was used to check that the STATA was loaded and unloaded.
Using software applications with X11 Forwarding¶
If you are attempting to open a GUI-based software application that uses X11 forwarding to display, such as MATLAB or Maestro, and
you get an error such as
Error: unable to open display localhost:19.0, this is most likely due to an issue with passwordless SSH.
See Using X11 for tips and troubleshooting information opening applications that use X11 forwarding.