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A list of all available modules sorted into CATEGORIES can be generated with the command module avail. A list of loaded modules is shown with the command module list. When you get a HLRN user account, your environment is provided by the system profile and should be set up correctly to use modules. If you change shell or modify your environment in such a way to make modules fail, contact the your HLRN support consultant for help.

Module commands

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• on the command line. This modifies the current shell environment, i.e., make selected binaries visible and defines environment variables to support compiling and linking. These modification are reversible and taken back when unloading a module.
• in batch scripts. This can be used to prepare the environment for jobs at HLRN.

It is also possible to put module commands in the .bashrc. However, this may result in various conflicts and errors. So just: don't!

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This command shows all modules available to be loaded.  Notice the version numbers and that some are marked as default. Modules makes it easy to switch between different software versions. At HLRN the The modules are sorted into CATEGORIES (all capital letters).

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Compiling and linking installed libraries using modules

Many software at HLRN depends packages depend on installed libraries like the MPI-libraries, fftw3, blas, netcdf or hdf5. On a PC, those libraries and headers would reside at well defined places in the system, where the are found by the compiler and linker and also by the loader during runtime. At HLRN, several Several versions of those libraries are available. They must be installed at non-default places. So compiler, linker and loader need help to find them, especially the correct version. The dream of software users is that loading a module is all to be done to deliver this help. Unfortunately, this is not the case for several reasons.

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