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Program On



8.3.13 (Sapelo2)

Author / Distributor

Texas Advanced Computing Center, please see https://www.tacc.utexas.edu/research-development/tacc-projects/lmod


From https://www.tacc.utexas.edu/research-development/tacc-projects/lmod: "Lmod is a Lua based module system that easily handles the MODULEPATH Hierarchical problem. Environment Modules provide a convenient way to dynamically change the users' environment through modulefiles. This includes easily adding or removing directories to the PATH environment variable. Modulefiles for Library packages provide environment variables that specify where the library and header files can be found."

Running Program

Also refer to Running Jobs on Sapelo2

Environment variables for software and applications installed on Sapelo2 are managed by Lmod. In general, each version of an application has its own module file and, whenever relevant, the compiler suite used for the compilation of the library or application is also added to the name of the module file.

The Lmod-User Guide is a good source of information for general Lmod usage.

At login time the Lmod facility is loaded automatically and a basic environment is loaded. This makes the module command available.

To view all modules currently loaded in your working environment, use the command

module list

To view all available modules on the system (note that we have not yet implemented a hierarchical structure of module files whereby the module avail command only lists modules compatible with your loaded compiler/MPI), use the command

module avail

To view a list of all modules installed, along with a short description, regardless of what is currently loaded, use the command

module spider

To search for a software package or to learn more about a package use the command

module spider foo

where "Foo" is the name of a software package. Note that you the name of the package can be entered in upper or lower case, the case is not relevant for the module spider command.

Modules can be loaded using the module load command. For example, to load the default PGI compiler suite module, use the command

module load PGI

Note that the name of the application is case sensitive for the module load command. That is, if the module name is PGI, you cannot load it as pgi or Pgi.

Modules can be unloaded using the module unload command. For example, to remove the PGI compiler suite from your PATH, unload the module with

module unload PGI

Information on a module can be obtained with the module help command. For example

module help PGI


------------- Module Specific Help for "PGI/19.10-GCC-8.3.0-2.32" --------------

C, C++ and Fortran compilers from The Portland Group - PGI

More information
 - Homepage: https://www.pgroup.com/

Detailed example

Before loading the intel module, the Intel compilers are not in the user's default PATH.

[shtsai@b1-1 ~]$ which icc
/usr/bin/which: no icc in (/scratch/shtsai/imginger/SG-023:/opt/xcat/bin:/opt/xcat/sbin:/opt/xcat/share/xcat/tools:/opt/xcat/bin:/opt/xcat/sbin:/opt/xcat/share/xcat/tools:/usr/lib64/qt-3.3/bin:/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/opt/puppetlabs/bin:/opt/singularity/bin:/opt/apps/slurm/prod/bin:/usr/tools/bin:/opt/dell/srvadmin/iSM/bin:/opt/singularity/bin:/opt/apps/slurm/prod/bin:/usr/tools/bin)


[shtsai@b1-1 ~]$ echo $LD_LIBRARY_PATH

After loading the intel/2019b module with the command

module load intel/2019b

the user's PATH, MANPATH, and LD_LIBRARY_PATH are modified. Now

[shtsai@b1-1 ~]$ which icc


[shtsai@b1-1 ~]$ echo $LD_LIBRARY_PATH


Please see the user guide at https://lmod.readthedocs.io/en/latest/010_user.html


  • Sapelo2: Version 8.3.13 is installed in /apps/lmod/8.3.13


64-bit Linux