[Beowulf] Pony: not yours.
Lux, Jim (337C)
james.p.lux at jpl.nasa.gov
Wed May 15 16:59:31 PDT 2013
From: "atchley tds.net" <atchley at tds.net<mailto:atchley at tds.net>>
Date: Wednesday, May 15, 2013 6:10 AM
To: Eugen Leitl <eugen at leitl.org<mailto:eugen at leitl.org>>
Cc: "tt at postbiota.org<mailto:tt at postbiota.org>" <tt at postbiota.org<mailto:tt at postbiota.org>>, "beowulf at beowulf.org<mailto:beowulf at beowulf.org>" <beowulf at beowulf.org<mailto:beowulf at beowulf.org>>
Subject: Re: [Beowulf] Pony: not yours.
Interesting, but depressing, presentation.
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 forward and with a 20 Mw power budget, an exascale machine's network would consume all the power leaving nothing for computation.
This is why the interest in free-space optical interconnects: no loss in the transport medium. Also, "direct node to node" interconnect without cables and connectors means you don't need power to run the line drivers/receivers or run the computation to do the adaptive equalizations.
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