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Emerging Technologies of Computation

Emerging Technologies of Computation. Montek Singh COMP790-084 Oct 6 , 2011. Today: Probabilistic Design. Today’s topics: approximate arithmetic simple applications Next time: more applications architectures and design tools challenges and benefits open questions.

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Emerging Technologies of Computation

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  1. Emerging Technologies of Computation Montek Singh COMP790-084 Oct6, 2011

  2. Today: Probabilistic Design • Today’s topics: • approximate arithmetic • simple applications • Next time: • more applications • architectures and design tools • challenges and benefits • open questions

  3. Probabilistic arithmetic • Supply reduced voltage to adder gates • fine-grain: each stage receives own voltage • coarse-grain: use binning

  4. Probabilistic arithmetic • Error induced: • Energy consumed:

  5. Probabilistic arithmetic • Voltage selection • fine-grain: each stage receives own voltage • coarse-grain: use binning

  6. Probabilistic arithmetic • Geometric model for voltage assignment • higher order bit receives progressively higher voltage

  7. Probabilistic arithmetic • Energy-correctness tradeoff

  8. Probabilistic arithmetic • Energy-correctness tradeoff example

  9. Delay-Induced Approximation • Lower voltage causes clock deadline to be missed • some of the longer carry chains cannot complete!

  10. Delay-Induced Approximation

  11. Delay-Induced Approximation • Example: DFT

  12. Delay-Induced Approximation • Example: DFT

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