IntelĀ® MPI Library Reference Manual for Linux* OS
The mpiexec configuration files specify the default options applied to all mpiexec commands.
If any of these files exist, their contents are prefixed to the command-line options for mpiexec in the following order:
System-wide <installdir>/etc/mpiexec.conf. The default location of the configuration file is the <installdir>/<arch>/etc.
User-specific $HOME/.mpiexec.conf
Session-specific $PWD/mpiexec.conf
You can override these files by defining environment variables and using command line options. You can skip these configuration files by using the mpiexec -noconf option.
You can create or modify these files. They contain mpiexec command-line options. Blank lines and lines that start with # are ignored. For example, to specify a default fabric, add the following line to the respective mpiexec.conf file:
-genv I_MPI_FABRICS <fabric>