This is a reference case of Prof. István Reguly, lecturer at PPCU, Hungary, previously a Research Associate at the Oxford e-Research Centre, University of Oxford. He is experienced with HPC benchmarks running on Power8 with XL compilers. 

Learn more about IBM XL Power compilers from https://www.ibm.com/products/xl-cpp-linux-compiler-power and https://www.ibm.com/products/xl-fortran-linux-compiler-power.