Aren some of the SPEC MPI2007 benchmarks already in SPEC CPU2006 and HPC2002? How are they different?
Some of the benchmarks in CPU2006 and MPI2007 derive from the same source codes. CPU2006 benchmarks are serialized versions of the applications while the corresponding MPI2007 benchmarks preserve their original MPI-parallel nature. They all have been given different workloads to better excercise a large parallel machine, and in some cases have additional source-code modifications for parallel scalability and portability. Therefore, for example, results with the CPU2006 benchmark 433.milc may be strikingly different from results with the MPI2007 benchmark 104.milc. One benchmark, 127.wrf2, is derived from a more current version of the WRF source than is 361.wrf_m from the earlier HPC2002 suite. Its larger workload is better for excercising the performance of modern parallel systems. Further, the HPC2002 rules allow the use of OMP parallelism, while this capability has been removed from the MPI2007 source code. So, again, results with the HPC2002 benchmark 361.
