HP XC System 3.x Software - Manual (Page 32)

could cause inconsistencies in the use of shared objects. If you have multiple compilers (perhaps with
incompatible shared objects) installed, it is probably wise to set MPI_CC (and others) explicitly to the
commands made available by the compiler's modulefile.
The contents of the modulefiles in the modulefiles_hptc RPM use the vendor-intended location of the
installed software. In many cases, this is under the /opt directory, but in a few cases (for example, the PGI
compilers and TotalView) this is under the /usr directory.
If you install a software package other than in the intended place, you must create or edit an appropriate
modulefile under the /opt/modules/modulefiles directory.
For the packages that install by default into the /usr directory (currently the PGI compilers and TotalView),
their corresponding modulefiles will try their vendor-intended location under the /usr directory. If they do
not find that directory, the packages will also search under the /opt directory. Therefore, you do not need
to make any changes to the modulefiles if you want to install third-party software consistently as the vendor
intended or consistently under the /opt directory,
If the package is the stable product intended to be used by the site, editing an existing modulefile is
appropriate. While each modulefile has its unique characteristics, they all set some variables describing the
top-level directory, and editing to adjust the string should be sufficient. You may need to repeat the adjustment
if you update the modulefiles_hptc RPM or otherwise rebuild your system.
If the package is a variant, for example, a beta version of a compiler, first copy the default modulefile to a
well-named copy, then edit the copy. You need root access to modify the modulefiles, which is generally
needed to install packages in either the /opt or /usr directories.
If you download a package into a private directory, you can create a private modulefiles directory. You can
then copy the corresponding default modulefile from under the /opt/modules/modulefiles directory
into a private modulefiles directory, edit the file, and then register the directory with the module use
command.
Supplied Modulefiles
The HP XC system provides the Modules Package (not to be confused with Linux kernel modules) to configure
and modify the user environment. The Modules Package enables dynamic modification of a user's environment
by means of modulefiles.
The HP XC system supplies the modulefiles listed in Table 3-1 .
32 Configuring Your Environment with Modulefiles