lec18_pwawaresched - Power Aware Scheduling Motivations...

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1 Power Aware Scheduling Motivations • PDAs and Pocket PCs – Display, processor, hard disk, and wireless LAN card are main sources of power consumption – Processor may consume up to 25% of the system power for laptop computers – Technology advance in processor architecture is much faster than battery technology • Powerful processors • Limited battery power • Idea: Trade spare time against power saving with DVS (Dynamic Voltage Scaling)
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2 Dynamic Voltage Scaling Processors • Crusoe processor of Transmeta, Intel StrongARM processor • Possible clock frequency (processor speed H) is proportional to supply voltage 3 2 V V f C P = • DVS can dynamically adjust supply voltage and thus processor speed • Power consumption rate (P) vs. supply voltage (V) and clock frequency (f) V f Optimal Voltage? (0<V H 1) H=1 01 0 P 16 160 t t H=1/2 0 P 16/8=2 40 t t 20 H=1/3 0 P 16/27=0.6 18 t t 20 30
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3 How to determine optimal speed in real-time systems?
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lec18_pwawaresched - Power Aware Scheduling Motivations...

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