Passing Hints to MPI-IO
This sample code shows how you may pass along hints about your parallel file system to MPI-IO. Armed with detailed information of this kind about hardware, chunk sizes, etc., MPI-IO can make better decisions about how to optimize the communication between MPI processes and the actual parallel file system to gain the best performance. On Stampede2, for example, these hints would pertain to the underlying Lustre parallel file system.