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Introduction

Introduction. Lin Zhong ELEC518, Spring 2011. Please connect to power. 10% vs. 50% Annual Growth Rate. Battery density. One watt steady power  13°C surface temperature increase. Burning pain : 41-43°C Tissue damage : 45°C. Electricity bill. Data center

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Introduction

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Presentation Transcript

  1. Introduction Lin Zhong ELEC518, Spring 2011

  2. Please connect to power

  3. 10% vs. 50% Annual Growth Rate Battery density

  4. One watt steady power13°C surface temperature increase

  5. Burning pain: 41-43°C Tissue damage: 45°C

  6. Electricity bill • Data center • Electricity bill is more than equipment bill • Home appliances

  7. There is no silver bullet for an energy-efficient mobile device

  8. Power profile: T-Mobile MDA • Power profile !=Energy profile

  9. Rule No. 1 • Focus on the big one! • Amdahl’s Law • Reduction of the power of α % of the system by p% leads to α∙p % reduction of the total power α

  10. Rule No. 2 • Minimize static energy consumption • IC consumes static power when it is merely powered

  11. Rule No. 3 • Minimize activity • When not doing things useful • Turn it off • Stop the clock • Check the manual for power-saving modes • Be aware of state transition overhead • Interrupt-driven instead of polling

  12. Rule No. 4 • Don’t forget parasites • More integrated solution leads to lower energy

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