Execute John the Ripper on multiple processors using mpirun

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http://unix.stackexchange.com – I am a linux noob trying to optimize John the Ripper for a security class. I am trying to use both processors to run John by using the mpirun program as suggested in this tutorial. I installed mpirun, but when I run this command, I get the following error: # sudo mpirun -np2 /usr/share/john --test=10 /usr/bin/mpirun: 1: eval: usr/share/john: Permission denied. Why am I getting this error and how can I run John with two processors using mpirun? I am running Ubuntu 12.10 on a VMware Fusion machine on a Mac with an Intel Core i5 (HowTos)