P66: Analyzing Multi-Layer I/O Behavior of HPC Applications
Abstract: In this work, we present an approach to analyze multi-layer I/O behavior of HPC applications. For a comprehensive analysis it is not sufficient to track I/O operations on a single layer because applications may combine multiple I/O paradigms (e.g., MPI I/O, NetCDF, HDF5). Furthermore, I/O libraries may use another I/O paradigm internally. With our approach, I/O activities can be captured at any layer. This work introduces methodologies to intercept calls to I/O libraries and presents an event design to record applications’ I/O activities. We implement our approach in the Score-P measurement system and prove its usability with a study of the Met Office/NERC Cloud Model (MONC) code.
Award: Best Poster Finalist (BP): no
Two-page extended abstract: pdf