For a more robust listing of modules, please use the module search on our Portal https://portal.rc.fas.harvard.edu/apps/modules
NOTE: This documentation describes the new lmod module system on the cluster
that was introduced Summer 2014. See this page for usage instructions for details.
On the Odyssey cluster, we want a variety of apps available, including different versions of the same app and apps that are incompatible. We accomplish this by using environment modules. When you first login to the cluster, you're presented with a very basic software environment. You then make apps available by loading the modules for them. The modules update shell environment variables so that the system can find and use the apps of your choice. Modules replace the need for separate scripts like
setup.csh for different shell types.
If you're transitioning from our older, legacy modules system, please see this page.
To see what apps are available to load, run the command:
This only shows what is immediately available to load. Upon loading some modules, more modules may become available. Specifically, loading a compiler implementation or MPI implementation will make available all the apps built with/against those apps. For example, you can run
module load gcc openmpi, and many more apps will show as available.
To see every single possible module you could use, run the command:
The output will be organized by what modules you have to load in order to make the different groups available.
Note that these commands deliver their output on stderr. If you want to search the output for keywords using grep, redirect stderr to stdout, e.g.:
module spider 2>&1 | grep KEYWORD
To see a description of any particular
MODULE, use the
module whatis MODULE
To load a module named
MODULE, run the command:
module load MODULE
Note that most modules names are of the form
NAME/VERSION. Specifying just
NAME (without the
/VERSION), will automatically load the latest version. Loading a module may automatically load other modules it depends on.
To see what modules you have loaded, run:
To unload a module, run:
module unload MODULE
To unload all modules currently loaded, run:
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. Permissions beyond the scope of this license may be available at Attribution.