How unsustainable our techno future is...An exascale system built with NVIDIA Kepler K20 co-processors would consume about 150 megawatts. That's nearly 10 times the amount consumed by Tianhe-2, which is composed of 32,000 Intel Ivy Bridge sockets and 48,000 Xeon Phi boards.
Theoretically, an exascale system – 100 times more computing capability than today's fastest systems – could be built with only x86 processors, but it would require as much as 2 gigawatts of power.
That's the entire output of the Hoover Dam.
Instead, HPC system developers need to take an entirely new approach to get around the power crunch, Dally said. The NVIDIA chief scientist said reaching exascale will require a 25x improvement in energy efficiency. So the 2 gigaflops per watt that can be squeezed from today's systems needs to improve to about 50 gigaflops per watt in the future exascale system.
Relying on Moore's Law to get that 25x improvement is probably not the best approach either. According to Dally, advances in manufacturing processes will deliver about a 2.2x improvement in performance per watt. That leaves an energy efficiency gap of 12x that needs to be filled in by other means.
Dally sees a combination of better circuit design and better processor architectures to close the gap. If done correctly, these advances could deliver 3x and 4x improvements in performance per watt, respectively.
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