VarDroid: Online Variability Emulation in Android/Linux Platforms

Variability is the real big challenge for integrated circuits. Today, simulators help to estimate the effect of variability, but fail to capture real workload dynamics and user interactions, which are fundamental to mobile devices. This paper presents VarDroid, a low-overhead tool to emulate power and performance variability on real platforms, running on top of the Android operating system. VarDroid enables analyzing the effect of variability in power and performance while capturing the complex interactions characteristic of mobile workloads, thus relating to user's quality of experience. The paper presents use cases to show the utility of VarDroid to test applications, device and OS robustness under the effects of variability. Our results show that a variability-agnostic OS can incur in a performance penalty of up to 60% and a power penalty of up to 20%.