Translations:Utiliser des modules/27/en

Module hierarchy

Many HPC clusters around the world use a flat module structure: All modules are at the same level. This becomes problematic when many combinations of versions of different modules are available on a system. For example, if you need to use the FFTW library and the module fftw is available in several versions, including a version compiled with GCC 9.3 and Open MPI 4.0, you might see modules named openmpi/4.0_gcc9.3 and fftw/3.8_gcc9.3_openmpi4.0. This is neither elegant nor practical. To solve this problem we use a hierarchy of modules. Rather than using the command

[name@server ~]$ module load gcc/9.3 openmpi/4.0_gcc9.3 fftw/3.8_gcc9.3_openmpi4.0

you instead use

[name@server ~]$ module load gcc/9.3 openmpi/4.0 fftw/3.8

This is made possible by using a module hierarchy. The fftw/3.8 module that is loaded will not be the same one that would be loaded if you had previously loaded the Intel compilers instead of GCC.