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Paving the Way: Multicore and Multi-Multicore

Paving the Way: Multicore and Multi-Multicore. Matt Reilly Chief Engineer SiCortex, Inc. 1. MultiCore and Multi MultiCore. Multicore isn’t enough: There are real time constraints that will demand greater execution and memory rates than can be achieved on one chip.

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Paving the Way: Multicore and Multi-Multicore

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  1. Paving the Way: Multicore and Multi-Multicore • Matt Reilly • Chief Engineer • SiCortex, Inc 1

  2. MultiCore and Multi MultiCore • Multicore isn’t enough: There are real time constraints that will demand greater execution and memory rates than can be achieved on one chip. • We need to develop new models for programming, beyond PThreads, and MPI. • We need a new generation of “Big N” enthusiasts/geeks.

  3. When Tsol = Tarith/N + Tmem/N + f(N)Tcomm • Three-D N3 FFT partitioned over N processors

  4. Programming Models • “Hide it all” libraries • Attractive in many domains • Requires a few wizards/architects • Be prepared to throw stuff away • “Expose it all” libraries • Small devoted priesthood • “Hide it all” languages • Destined to fail: they don’t recognize the NUMA hierarchy” • “Realistic” languages • Growing presence • Interesting approaches to “reality mapping”

  5. Why Johnny Can’t Write Parallel Programs • Parallel programming is relegated to “afterthought” in curricula. • Time for us to exercise a little influence • But please, save us from “Industry wide coordinated initiatives” • Few “playgrounds” available. • This is easy: Install accessible parallel machines everywhere • Big national monuments are not the answer

  6. The Take-Away • Successful Multi-Multicore adventures will revere the model: • Tsol = Tarith/N + Tmem/N + TIO + f(N)Tcomm • Current programming techniques are inadequate. • We need more competent “high processor count” parallel programmers.

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