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/opt/lsf-openmpi/1.5.4/bin//mpirun
You can also check that the version of mpi with LSF hooks is loaded by running:
renata@bullet0002 $ module list
Currently Loaded Modulefiles:
1) lsf-openmpi_1.5.4-x86_64
A bsub command which uses this mpi should look like:
...