The manpage of mpiexec
(INSTALLATION_DIRECTORY/share/man/man1/mpiexec.1from 1.0.8rc1)
describes the option
       -file <name>
              - implementation-defined specification file
I think this should be "-machinefile" instead of "-file". According to
"mpiexec --help" there is no such option as -file for mpiexec.
hth
raju