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Chasing the Energizer Bunny

Chasing the Energizer Bunny. Ben Zorn Microsoft Research. Form Factor Fuels Innovation. Form factor more important now than CPU performance Power efficiency and form factor linked No one talks about the “power wall” Battery technology not improving exponentially

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Chasing the Energizer Bunny

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  1. Chasing the Energizer Bunny Ben Zorn Microsoft Research

  2. Form Factor Fuels Innovation • Form factor more important now than CPU performance • Power efficiency and form factor linked • No one talks about the “power wall” • Battery technology not improving exponentially • Entire problem domains revolve around power performance • Personal devices exploding • Cell phones, Ipod, PSP, mp3 players • Devices fundamentally change how we live, work • “Ipod Moms”, Ben’s audible books MSP’05 Wild Ideas

  3. Prediction: Multi-core follows Power • My prediction: • Greatest uptake in multi-core designs will be in systems that don’t have as much legacy code • Opportunities for 10-100x power reductions are available, under-investigated • Domain-specific applications of multi-core easier to bring to market (voice recognition, vision, etc.) • “The revolution has already begun.” MSP’05 Wild Ideas

  4. Implied Research Agenda? • Complexity increases power consumption (David Sehr) • Out-of-order execution inefficient, out of favor • Incidentally, also increases security risk • General-purpose HW less power efficient than special-purpose • Hiding latency the best use of all those transistors (in caches)? • A return to RISC-style HW/SW design? • Every field rediscovers “simplicity” on predictable schedule MSP’05 Wild Ideas

  5. Relation to MSP? • Performance should include power efficiency • The power cost of latency reduction and/or implementation complexity should be quantified • More papers in MSP about power • Better frameworks for evaluating power efficiency • More evaluations of designs in context of actual systems (not SPEC) MSP’05 Wild Ideas

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