system hints: hints via config file
In ROMIO, setting hints looks like this: MPI_Info info; MPI_Info_create(&info); MPI_Info_set(“cb_buffer_size”, “8388608”); Setting these hints in the program can make sense in many cases — for example, you know something specific about the workload and wish to guide ROMIO’s optimizations a bit. But what if you want to explore the impact of hints on your …