  Kepler GTX Titan Black and Kepler Tesla K40 are still the best GPUs for high
performance computing, although Maxwell GPUs such as GTX 980 are available in
the market. Hence, we measure the performance of our lattice QCD codes using
the Kepler GPUs. We also upgrade our code to use the latest CPS (Columbia
Physics System) library along with the most recent QUDA (QCD CUDA) library for
lattice QCD. These new libraries improve the performance of our conjugate
gradient (CG) inverter so that it runs twice faster than before. We also
investigate the performance of Xeon Phi 7120P coprocessor. It has similar
computing power with the Kepler GPUs in principle. However, its performance for
our CG code is significantly inferior to that of the GTX Titan Black GPUs at
present.
