Lmod
Category
Other
Program On
Sapelo
Version
5.8
Author / Distributor
Texas Advanced Computing Center, please see https://www.tacc.utexas.edu/research-development/tacc-projects/lmod
Description
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 Sapelo.
Environment variables for software and applications installed on Sapelo 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 modules installed, regardless of what is currently loaded, use the command
module spider
Modules can be loaded using the module load command. For example, to load the PGI compiler suite module, use the command
module load pgi/14.9
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/14.9
Information on a module can be obtained with the module help command. For example
module help pgi/14.9
returns
--------------------- Module Specific Help for "pgi/14.9" ---------------------- This module sets up the path to use the Portland Group compiler suite pgf77 (F77 source code) pgf90 (F90 source code) pgcc (C source code) pgCC (C++ source code) Version 14.9
Some module files also include further description which can be view with the module whatis command. For example
module whatis pgi/14.9
returns
pgi/14.9 : Name: PGI pgi/14.9 : Version: 14.9 pgi/14.9 : Category: pgi/14.9 : Keywords: compiler, profiler, debugger pgi/14.9 : URL: http://www.pgroup.com/ pgi/14.9 : Description: Portland Group compiler suite
Detailed example
Before loading the intel module, the Intel compilers are not in the user's default PATH.
[username@uga-8a59d7e ~]$ which icc /usr/bin/which: no icc in (/opt/scyld/maui/bin:/usr/lib64/qt-3.3/bin:/opt/scyld/maui/bin:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/usr/share/pvm3/lib:/home/username/bin)
and
[username@uga-8a59d7e ~]$echo $LD_LIBRARY_PATH /opt/scyld/maui/lib:
After loading the intel module with the command
module load intel/15.0.2
the user's PATH, MANPATH, and LD_LIBRARY_PATH are modified. Now
[username@uga-8a59d7e ~]$ which icc /usr/local/apps/intel/2015.2.164/bin/icc
and
[username@uga-8a59d7e ~]$ echo $LD_LIBRARY_PATH /usr/local/apps/intel/2015.2.164/ipp/lib/intel64:/usr/local/apps/intel/2015.2.164/lib/intel64:/usr/local/apps/intel/2015.2.164/mkl/lib/intel64:/usr/local/apps/intel/2015.2.164/tbb/lib/intel64/gcc4.4:/usr/local/apps/intel/2015.2.164/tbb/lib/intel64:/opt/scyld/maui/lib:
If the user subsequently loads the pgi module, the intel module will be automatically unloaded:
[username@uga-8a59d7e ~]$ module load pgi/14.9 Lmod is automatically replacing "intel/15.0.2" with "pgi/14.9"
Documentation
Please see the user guide at https://www.tacc.utexas.edu/research-development/tacc-projects/lmod/user-guide
Installation
Version 5.8 is installed in /usr/local/apps/lmod/5.8
System
64-bit Linux