On Thu, May 16, 2013 at 10:28 AM, Mark Hahn <h...@mcmaster.ca> wrote:
> >> > https://docs.google.com/file/d/0B83UyWf1s-CdZnFoS2RiU2lJbEU/edit?usp=drive_web > > Interesting, but depressing, presentation. > > I found it unilluminating, actually. don't we all know about power issues? > Know? Yes. To this extent? Maybe not. > > At HotInterconnects in 2011, Intel gave a presentation about the > reductions > > in power per flop over time. The corresponding communication power > > consumption per bit was flat (no improvement). Projecting the trends > > well, it has to be said that most computation is mundane and doesn't > require > multiple processors, let alone big clusters. so the fact that the computer > industry focuses on this domain is appropriate. > > > forward and with a 20 Mw power budget, an exascale machine's network > would > > consume all the power leaving nothing for computation. > > well, that sounds absurd - were they assuming a full-bisection fat tree of > older (hotter, lower fanout) generation interconnect? Even dragonfly topologies (high-radix routers with low hop count) and a bandwidth taper of 1/2 given current power consumption levels will exceed 20 Mw.
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