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Instructions to run vecadd_mpi
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1) Ensure ti-openmpi package is installed
2) Ensure all the nodes have OpenMPAcc and OpenCL installed with the same 
   relative paths
3) Compile vecadd_mpi
4) hosts:  Create a file with the hostnames of the nodes over which the
           program is intended to be run
5) Execution: Assuming n being the number of nodes:

$ <path to mpirun>/mpirun -x LD_LIBRARY_PATH -x TI_OCL_INSTALL -x TI_OCL_CGT_INSTALL -x TI_OMPACC_INSTALL -np n --hostfile hosts vecadd_mpi

