Pegasus Software Modules

IDSC ACS continually updates applications, compilers, system libraries, etc. To facilitate this task and to provide a uniform mechanism for accessing different revisions of software, ACS uses the modules utility. At login, modules commands set up a basic environment for the default compilers, tools, and libraries such as:  the $PATH, $MANPATH, and $LD_LIBRARY_PATH environment variables. There is no need to set them or update them when updates are made to system and application software.

From Pegasus, users can view currently loaded modules with module list and check available software with module avail *package* (omitting the package name will show all available modules). Some modules are loaded automatically upon login:

[username@pegasus ~]$ module list
Currently Loaded Modulefiles:
  1) perl/5.18.1(default)
[username@pegasus ~]$ module avail R

----------------------------- /share/Modules/hihg ------------------------------
ROOT/5.34.32

----------------------- /share/mfiles/Compiler/gcc/8.3.0 -----------------------
R/3.6.3          R/4.0.3          R/4.1.0(default)

[username@pegasus ~]$ module load R
[username@pegasus ~]$ module list
Currently Loaded Modulefiles:
  1) perl/5.18.1(default)    2) R/4.1.0(default)

The table below lists commonly used modules commands.

Pegasus Modules

Command	Purpose
module avail	lists all available modules
module list	list modules currently loaded
module purge	restores original setting by unloading all modules
module load package	loads a module e.g., the python package
module unload package	unloads a module e.g., the python package
module switch old new	replaces old module with new module
module display package	displays location and library information about a module

See our Policies page for minimum requirements and more information.