Phase-Based Accurate Power Modeling for Mobile Application Processors

Abstract

Modern mobile application processors are required to execute heavier workloads while the battery capacity is rarely increased. This trend leads to the need for a power model that can analyze the power consumed by CPU and GPU at run-time, which are the key components of the application processor in terms of power savings. We propose novel CPU and GPU power models based on the phases using performance monitoring counters for smartphones. Our phase-based power models employ combined per-phase power modeling methods to achieve more accurate power consumption estimations, unlike existing power models. The proposed CPU power model shows estimation errors of 2.51% for ARM Cortex A-53 and 1.97% for Samsung M1 on average, and the proposed GPU power model shows an average error of 8.92% for the Mali-T880. In addition, we integrate proposed CPU and GPU models with the latest display power model into a holistic power model. Our holistic power model can estimate the smartphone′s total power consumption with an error of 6.36% on average while running nine 3D game benchmarks, improving the error rate by about 56% compared with the latest prior model.

Phase-Based Low Power Management Combining CPU and GPU for Android Smartphones

“…(2) Unlike the existing smartphone low-power techniques, this paper proposes a technique that obtains power savings by considering the power consumption of smartphones in execution time. For execution time consumption prediction, the proposed low-power technique uses a power model [5] that predicts CPU and GPU power consumption in real time and a display power model [14] that predicts power consumption using display pixel size. The CPU and GPU power models quickly calculate power consumption within 50 ms through calculations using factors created through reinforcement learning through genetic algorithms.…”

“…In this paper, the component-specific power consumption ratio of the Galaxy S7, a smartphone to be used as a target, is 29%, 56%, 11%, and 4% for the central processing unit (CPU), graphics processing unit (GPU), display, and others, respectively [5]. The sum of the power consumption ratios of the CPU, GPU, and display components is 96%, accounting for most of the power consumption.…”