Measuring QoE of interactive workloads and characterising frequency governors on mobile devices

V. Seeker, P. Petoumenos, H. Leather, B. Franke

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract / Description of output

Mobile computing devices such as smartphones and tablets have become tightly integrated with many people's life, both at work and at home. Users spend large amounts of time interacting with their mobile device and demand an excellent user experience in terms of responsiveness, whilst simultaneously expecting a long battery life between charging cycles. Frequency governors, responsible for increasing or decreasing the Cpu clock frequency depending on the current workload and external events, try to balance the two contrasting goals of high performance and low energy consumption. However, despite their critical role in providing energy efficiency it is difficult to measure the effectiveness of frequency governors in an interactive environment. In this paper we develop a novel methodology for creating repeatable, fully automated, realistic, workloads that can accurately measure time lag in interactive applications resulting from non-optimally selected operating frequencies. We also introduce a new metric capturing the user experience for different Android frequency governors. We evaluate interactive workloads to demonstrate how our approach enables us to automatically record and replay sequences of user interactions for different system configurations. We demonstrate that none of the available Android frequency governors performs particularly well, but leave substantial room for improvement. We show that energy savings of up to 27% are possible, whilst delivering a user experience that is better than that provided by the standard Android frequency governor. We also show that it is possible to save 47% energy with performance that is indistinguishable from permanently running the Cpu at the highest frequency.
Original languageEnglish
Title of host publicationWorkload Characterization (IISWC), 2014 IEEE International Symposium on
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages61-70
Number of pages10
ISBN (Print)978-1-4799-6452-9
DOIs
Publication statusPublished - 1 Oct 2014

Keywords / Materials (for Non-textual outputs)

  • microprocessor chips
  • mobile computing
  • mobile handsets
  • quality of experience
  • Android frequency governors
  • CPU clock frequency
  • QoE
  • battery life
  • charging cycles
  • frequency governor characterisation
  • interactive applications
  • interactive workloads
  • mobile computing devices
  • time lag
  • Androids
  • Humanoid robots
  • Mobile communication
  • Mobile handsets
  • Standards
  • Time-frequency analysis

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