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Colloquium – Alexandru Uta

August 28 @ 10:00 am - 11:00 am

Alexandru Uta
Vrije Universiteit Amsterdam

August 28, 2019
3780 WEB

lecture – 10:00am

Host: Rob Ricci

Big Data in the Wild:The Effects of Cloud Network Performance Variability

Performance variability has been acknowledged as a problem for over a decade by cloud practitioners and performance engineers. Yet, our survey of top systems conferences reveals that the research community regularly disregards variability when running experiments in the cloud. Focusing on networks, we assess the impact of variability on big-data cloud-based workloads. Using real-world variability traces from the gigabit-era, we show that not only does network variability incur (variable) slowdowns of up to 16X, but also unreliable experimentation: few repetitions run high risks of reporting unreliable numbers; 30–50 experiments are needed in practice to achieve tight confidence intervals. We characterize the network variability of post-gigabit networks and show that, even though commercial cloud providers implement mechanisms for quality-of-service enforcement, variability still occurs. Consequently, big-data workloads still suffer from significant variable slowdowns, and lack of predictability, even when applying state-of-the-art experimentation.


August 28
10:00 am - 11:00 am
Event Category:


3780 WEB