WASP: Efficient Power Management Enabling Workload-Aware, Self-Powered AIoT Devices

The wide adoption of edge AI has heightened the demand for various battery-less and maintenance-free smart systems. Nevertheless, emerging Artificial Intelligence of Things (AIoT) are complex workloads showing increased power demand, diversified power usage patterns, and unique sensitivity to power management (PM) approaches. Existing AIoT devices cannot select the most appropriate PM tuning knob, and therefore they often make sub-optimal decisions. In addition, these PM solutions always assume traditional power regulation circuit which incurs non-negligible power loss and control overhead. This can greatly compromise the potential of AIoT efficiency. In this paper, we explore power management (PM) optimization for emerging self-powered AIoT devices. We propose WASP, a highly efficient power management scheme for workload-aware, self-powered AIoT devices. The novelty of WASP is two fold. First, it combines offline profiling and light-weight online control to select the most appropriate PM tuning knobs for the given DNN models. Second, it is well tailored to a reconfigurable voltage regulation module that can make the best use of the limited power budget. Our results show that WASP allows AIoT devices to accomplish 65.6% more inference tasks under a stringent power budget without any performance degradation compared with other existing approaches.