Describe InfolabClusterComputeHowtoMpi here.

Here is an example of a bit more complex script to run an MPI job (copied from http://csc.cnsi.ucsb.edu/docs/running-jobs-torque):

#PBS -l nodes=2:ppn=4

# Make sure that we are in the same subdirectory as where the qsub command 
# is issued. 
cd $PBS_O_WORKDIR 

#  make a list of allocated nodes(cores)
cat $PBS_NODEFILE > nodes

# How many cores total do we have?
NO_OF_CORES=`cat $PBS_NODEFILE | egrep -v '^#'\|'^$' | wc -l | awk '{print $1}'`
NODE_LIST=`cat $PBS_NODEFILE `

# Just for kicks, see which nodes we got.
echo $NODE_LIST

# Run the executable. *DO NOT PUT* a '&' at the end!!
mpirun -np $NO_OF_CORES -machinefile nodes ./pi3 >& log