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Energy efficiency of mobile clients in cloud computing Antti P. Miettinen, Jukka K. Nurminen Nokia Research Center, Helsinki, Finland 22.6.2010 Nokia Research Center 1 Mobile cloud computing Remote processing Local processing Data format?

  1. Energy efficiency of mobile clients in cloud computing Antti P. Miettinen, Jukka K. Nurminen Nokia Research Center, Helsinki, Finland 22.6.2010 Nokia Research Center 1

  2. Mobile cloud computing Remote processing Local processing Data format? Bitmaps? Vector graphics? Nokia Research Center

  3. Balance: computing versus communication When is it feasible to move to cloud? computing communication Nokia Research Center

  4. Computing: what is the energy cost? Large variation Nokia Research Center

  5. Computing: current mobile devices High performance Energy efficiency Nokia Research Center

  6. Computing: dynamic power management DVFS = Dynamic Voltage and Frequency Scaling E = Pt P ~ V 2 f V ~ f P t ~ 1/f P t t Nokia Research Center

  7. Computing: effect of dynamic power management Nokia Research Center

  8. Communication: effect of bit-rate and technology Nokia Research Center

  9. Communication: effect of traffic pattern Nokia Research Center

  10. Communication: effect of DPM Nokia Research Center

  11. Computing & communication: Effect of DPM High performance ? Energy efficiency Nokia Research Center

  12. The balance – roughly 1000 cycles versus 1 byte 1000 1 cycles byte Cost of communication Cost of computing has large variance is reasonably stable Nokia Research Center

  13. Computational intensity Workload Cycles/byte gzip ASCII compress 330 bzip2 ASCII compress 1080 html2text wikipedia.org 2100 html2text en.wikipedia.org 5900 pdftotext N900 datasheet 960 pdftotext E72 datasheet 8900 Nokia Research Center

  14. In practice (PDF viewer) Energy can be saved Performance can be improved Nokia Research Center

  15. Fruitful area for further research • New computationally intensive applications for mobile devices? • Technology development? • Radio bit-rates versus computing efficiency? • Tools for managing the complexity? • Energy aware development tools • Energy aware middle-ware? • Energy optimized protocols for thin clients? • Server side technologies for optimizing client energy efficiency? Nokia Research Center

  16. Thank You Nokia Research Center 16

  17. Coarse grain estimation can be simple Nokia Research Center

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