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<span style="font-weight:bold">From: </span>"atchley tds.net" <<a href="mailto:atchley@tds.net">atchley@tds.net</a>><br>
<span style="font-weight:bold">Date: </span>Wednesday, May 15, 2013 6:10 AM<br>
<span style="font-weight:bold">To: </span>Eugen Leitl <<a href="mailto:eugen@leitl.org">eugen@leitl.org</a>><br>
<span style="font-weight:bold">Cc: </span>"<a href="mailto:tt@postbiota.org">tt@postbiota.org</a>" <<a href="mailto:tt@postbiota.org">tt@postbiota.org</a>>, "<a href="mailto:beowulf@beowulf.org">beowulf@beowulf.org</a>" <<a href="mailto:beowulf@beowulf.org">beowulf@beowulf.org</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [Beowulf] Pony: not yours.<br>
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<div dir="ltr">Interesting, but depressing, presentation.
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<div style="">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.</div>
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<div>--</div>
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<div>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.</div>
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