The Unknowns that come with Exascale

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Over at Reed’s Ruminations, Dan Reed writes that the road to Exascale will come complete with the unknowns that make up any change that involves orders of magnitude.

All currently envisioned exascale systems would require parallelism at unprecedented scale, and barring new, energy efficient memory technologies; they would be memory starved relative to current systems, even under a 20 MW system design point; and multilevel fault tolerance would be required to achieve acceptable systemic mean time to failure (MTBF). Extraordinary parallelism, unprecedented data locality and adaptive resilience: these are daunting architecture, system software and application challenges for exascale computing.

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