Translations:Utiliser des modules/27/en
Module hierarchy[edit]
Most systems 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 4.8 and Open MPI 1.6, you might see modules named openmpi/1.6_gcc4.8 and fftw/3.3_gcc4.8_openmpi1.6. 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/4.8 openmpi/1.6_gcc4.8 fftw/3.3_gcc4.8_openmpi1.6
you instead use
[name@server ~]$ module load gcc/4.8 openmpi/1.6 fftw/3.3
This is made possible by using a module hierarchy. The fftw/3.3 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.