Practical Hybrid Parallel Application Performance Engineering

This tutorial presents state-of-the-art performance tools for leading-edge HPC systems founded on the community-developed Score-P instrumentation and measurement infrastructure, demonstrating how they can be used for performance engineering of effective scientific applications based on standard MPI, OpenMP, hybrid combination of both, and increasingly common usage of accelerators. Parallel performance tools from the Virtual Institute - High Productivity Supercomputing (VI-HPS) are introduced and featured in live demonstrations with Score-P, Scalasca, Vampir, and TAU. We present the complete workflow of performance engineering, including instrumentation, measurement (profiling and tracing, timing and PAPI hardware counters), data storage, analysis, tuning, and visualization. Emphasis is placed on how tools are used in combination for identifying performance problems and investigating optimization alternatives. This will help to prepare participants to locate and diagnose performance bottlenecks in their own parallel programs.

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Contributors:

• Sameer Shende (University of Oregon)
• Christian Feld (Jülich Supercomputing Centre)
• Markus Geimer (Jülich Supercomputing Centre)
• Bill Williams (Technische Universität Dresden, Technische Universität Dresden, ZIH)