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Lifting the Energy Veil. A plea for data and science Philip Levis Computer Systems Lab Stanford University. Amdahl’s Law Extended. Costs bound benefits Corollary: optimize the big cost Death of a thousand cuts?. 80%. 20%. Streetlights. ?. 50%. Well-Lit CPUs.

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Lifting the energy veil

Lifting the Energy Veil

A plea for data and science

Philip Levis

Computer Systems Lab

Stanford University


Amdahl s law extended
Amdahl’s Law Extended

  • Costs bound benefits

  • Corollary: optimize the big cost

  • Death of a thousand cuts?

80%

20%



Well lit cpus

50%

Well-Lit CPUs

In practice, a 3-5% improvement is achievable.


Contrast displays

35%

In practice, a 20% improvement

is achievable.

Contrast: Displays


It s no wonder

Bill Dally, Chief Scientist, NVIDIA

The issue is that people don’t realize all of the options in the design space. You can turn sleep current arbitrarily low.

Krisztian Flautner, Director of Advanced Research, ARM

You could have lower power RAM, but engineering it is expensive and the market would not pay for the investment.

Paul Kimelman, chief architect of ARM Cortex M3

I think you will find that a part designed to run at 50MHz and above with 64K of SRAM will always draw more power in sleep mode.

It’s No Wonder….


Data is truth
Data is Truth

  • Separate artifact from essence

    • (addressing either is commendable)

  • “Interesting” is a bad word

  • Open, public data sets


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