Yes, supersonic travel over land is restricted in the U.S.; so for example the SST was good for NY to London but not NY to LA. <br>
<br>
We're no where near the limits to information per cubic centimter; but
I don't know how to define information **processing** per cubic
centimeter. Maybe if we define causally-correlated flops (so, the
seqential, dependent FLOPS of a single core, single thread machine is
100%, the FLOPS distributed across the globe are 0%, and the
distributed cores of a Beowulf working on a single problem, but with
some wasted effort because not every core can take into account every
up-to-the-nanosecond current state of every other core) is X% for 0
< X < 100. Then, we could define causally-correlated FLOPS per
cubic Centimter as a unit of information processing density..?
And to find the limit you'd have to account for the cc's where the heat
goes.<br>
<br>
But I'm no physicist.<br>
<br>
Peter<br><br><div><span class="gmail_quote">On 4/9/09, <b class="gmail_sendername">Prentice Bisbal</b> <<a href="mailto:prentice@ias.edu">prentice@ias.edu</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<a href="mailto:richard.walsh@comcast.net">richard.walsh@comcast.net</a> wrote:<br> ><br> > ----- Original Message -----<br> > From: "Ken Schuster" <<a href="mailto:ken@kschuster.org">ken@kschuster.org</a>><br>
> To: <a href="mailto:beowulf@beowulf.org">beowulf@beowulf.org</a><br> > Sent: Wednesday, April 8, 2009 2:29:17 PM GMT -05:00 US/Canada Eastern<br> > Subject: [Beowulf] Moores Law is dying<br> ><br> >>An IBM researcher says Moore's Law is running out of gas. IBM Fellow<br>
> Carl Anderson, who<br> >>oversees physical design and tools in its server division, predicted<br> > the end of continued exponential<br> >>scaling down of the size and cost of semiconductors:<br> ><br>
>>"There was exponential growth in the railroad industry in the 1800s;<br> > there was exponential<br> >>growth in the automobile industry in the 1930s and 1940s; and there was<br> > exponential growth<br>
>>in the performance of aircraft until [test pilots reached] the speed of<br> > sound. But eventually<br> >>exponential growth always comes to an end," said Anderson.<br> ><br> > Mmm ... he may be right, but I do not like his historical references<br>
> which seem<br> > to conflate engineering and economics. Better to refer to the<br> > improvement in<br> > magnets or something similar. But, I like the speed of sound reference<br> > because<br> > it suggests that there is a Moore's Law barrier to be broken. There is<br>
> a lot of<br> > talk about "walls" these days ... the memory wall, the power wall, ...<br> > but we with<br> > respect compute power we have a ways to go before we reach the<br> > Bremermann Limit.<br>
><br> <br> <br>This is clearly off-topic, so please feel free to ignore:<br> <br> I disagree with the sonic barrier wall analaogy. Is it that clearly<br> technical barrier the slowed down jet research, or did the nuisance of<br>
sonic booms to people on the ground just make supersonic R&D less<br> convenient? I've heard that supersonic travel over land is restricted in<br> the US.<br> <br> <br> --<br> <br>Prentice<br> <br>_______________________________________________<br>
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</blockquote></div><br>