#!/bin/tcsh

###########################################
# Output goes to file BATCH_OUTPUT.
# Error output goes to file BATCH_ERRORS.
# If you want the output to go to another file, change BATCH_OUTPUT 
# or BATCH_ERRORS in the following lines to the full path of that file. 

#PBS  -o BATCH_OUTPUT 
#PBS  -e BATCH_ERRORS 

# Reserve full nodes so we don't get repeats.
#PBS -lvmem=4GB,pmem=4Gb,mem=4Gb,nodes=4:ppn=4,cput=2:00:00,walltime=1:00:00

# Change to directory from which qsub command was issued 
   cd $PBS_O_WORKDIR

/bin/rm -f shortfile
sort -u  ${PBS_NODEFILE} > shortfile

echo 'This will give 4 copies for the first host'
 
time mpirun -np 4 ./mpi_hello_hostname 


echo 'Now just one per host by using shortfile which has unique machine names'

time mpirun -np 4 -machinefile shortfile ./mpi_hello_hostname