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If You Like Money, General-Purpose I s for You

If You Like Money, General-Purpose I s for You. Chris Hughes Parallel Computing Lab Intel. Hardware Specialization. Affirmative claim: general-purpose computing = dead end “We can’t turn on all our transistors anyway” “Diminishing gains from general-purpose techniques”

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If You Like Money, General-Purpose I s for You

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  1. If You Like Money,General-Purpose Is for You Chris Hughes Parallel Computing Lab Intel

  2. Hardware Specialization • Affirmative claim: general-purpose computing = dead end • “We can’t turn on all our transistors anyway” • “Diminishing gains from general-purpose techniques” • “Heterogeneous systems only way to achieve big efficiency gains” • Yes, the sky is falling

  3. Reality • Heterogeneous systems nightmare for software developers • Also, gains limited from data/control transfer • Further, we can capture most gains of specialized HW w/o punishing app developers • How do I know this? • We do it all the time • That’s how we make money

  4. It’s All About Money • Greed is good • App developers: New functionality = • Re-codingdoesn’t make money • Existing code must improve automatically • System vendors: • Improve existing apps that drive sales = • Make it easy to add new functionality =

  5. How To Make Money • Don’t mess with the programming model • Don’t sacrifice performance on existing apps

  6. Specialization Breaks The Rules • Specialization almost always does one or both • Expose that work or data migrates • Performance on legacy code degrades • Very hard to implement algorithmic advances • Etc.

  7. Good News! • Industry likes making money • Thus, we already follow above rules AND capture most benefits of specialization

  8. Specialization’s Real Role • Research into specialization helps drive evolution of general-purpose systems • Proof by example: • Floating-point instructions, encryption instructions, wider SIMD & introduction of many-core • Trying to sell specialized systems means: • (1) You hate money • (2) You hate programmers

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