Internal Program Version: mpi-selector  1.0.3

A simple tool that allows system administrators to set a site-wide
default for which MPI implementation is to be used, but also allow
users to set their own defaults MPI implementation, thereby overriding
the site-wide default.

The default can be changed easily via the mpi-selector command --
editing of shell startup files is not required.

http://www.openfabrics.org