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Conquering Noise with Hardware Counters on HPC Systems
DescriptionWith increasing system performance and complexity, it is becoming increasingly crucial to examine the scaling behavior of an application and thus determine performance bottlenecks at early stages. Unfortunately, modeling this trend is a challenging task in the presence of noise, as the measurements can become irreproducible and misleading thus resulting in strong deviations from the real behavior. While noise impacts the application runtime, it has little to no effect on some hardware counters like ﬂoating-point operations. However, selecting the appropriate counters for performance modeling demands some investigation. We perform a noise analysis on various hardware counters. Using our noise generator, we add on top of the system noise additional noise to inspect the counters' variability. We perform the analysis on five systems with three applications in the presence of various noise patterns and categorize the counters across the systems according to their noise resilience.
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