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Re: Google set to make its own energy efficient ARM Server chip

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From Grant Edwards <invalid@invalid.invalid>
Newsgroups comp.os.linux.advocacy, comp.os.linux.embedded, uk.comp.os.linux
Subject Re: Google set to make its own energy efficient ARM Server chip
Date Mon, 16 Dec 2013 02:08:15 +0000 (UTC)
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Cross-posted to 3 groups.

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On 2013-12-16, unruh <unruh@invalid.ca> wrote:

> Actually I suspect it is far higher than that. The theoretical maximum
> is completely reversible computing, which should in principle create no
> heat at all. That tends to be very slow.  Next is to argue that each
>  erasure costs kT of energy.
> Again they are far far far less efficient than that. Even 1kT per bit
> operation would imply only 10^-21J/bit operation. Assuming 64 bit words
> and 10GHz operation, that would still only imply 10^(-9) watts of power
> consumption. Instead what we get is something like 100W so, that is
> 99.99999999% of the power going into heat rather than useful
> computations. 


>> 100% of the power in a data center turns into heat.
>
> Actually no, some of it goes into reducing the entropy of the system. 

But surely that's only temporary.  Does entropy continue to be reduced
indefinitly for as long as a computer is being run?  Or does it reach
some sort of "average" level and from then on you're just
transitioning between different configurations of similar entropy?

-- 
Grant Edwards               grant.b.edwards        Yow! You can't hurt me!!
                                  at               I have an ASSUMABLE
                              gmail.com            MORTGAGE!!

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Google set to make its own energy efficient ARM Server chip 7 <email_at_www_at_enemygadgets_dot_com@enemygadgets.com> - 2013-12-14 21:18 +0000
  Re: Google set to make its own energy efficient ARM Server chip Grant Edwards <invalid@invalid.invalid> - 2013-12-14 22:52 +0000
    Re: Google set to make its own energy efficient ARM Server chip 7 <email_at_www_at_enemygadgets_dot_com@enemygadgets.com> - 2013-12-14 23:38 +0000
      Re: Google set to make its own energy efficient ARM Server chip Les Cargill <lcargill99@comcast.com> - 2013-12-14 18:16 -0600
      Re: Google set to make its own energy efficient ARM Server chip Grant Edwards <invalid@invalid.invalid> - 2013-12-15 22:47 +0000
        Re: Google set to make its own energy efficient ARM Server chip unruh <unruh@invalid.ca> - 2013-12-16 00:45 +0000
          Re: Google set to make its own energy efficient ARM Server chip Grant Edwards <invalid@invalid.invalid> - 2013-12-16 02:08 +0000
            Re: Google set to make its own energy efficient ARM Server chip unruh <unruh@invalid.ca> - 2013-12-16 03:30 +0000
          Re: Google set to make its own energy efficient ARM Server chip 7 <email_at_www_at_enemygadgets_dot_com@enemygadgets.com> - 2013-12-16 08:38 +0000
            Re: Google set to make its own energy efficient ARM Server chip Grant Edwards <invalid@invalid.invalid> - 2013-12-16 15:16 +0000
          Re: Google set to make its own energy efficient ARM Server chip 7 <email_at_www_at_enemygadgets_dot_com@enemygadgets.com> - 2013-12-16 08:38 +0000
          Re: Google set to make its own energy efficient ARM Server chip 7 <email_at_www_at_enemygadgets_dot_com@enemygadgets.com> - 2013-12-16 08:38 +0000
          Re: Google set to make its own energy efficient ARM Server chip 7 <email_at_www_at_enemygadgets_dot_com@enemygadgets.com> - 2013-12-16 08:38 +0000
            Re: Google set to make its own energy efficient ARM Server chip unruh <unruh@invalid.ca> - 2013-12-16 17:51 +0000
              Re: Google set to make its own energy efficient ARM Server chip 7 <email_at_www_at_enemygadgets_dot_com@enemygadgets.com> - 2013-12-16 21:56 +0000
                Re: Google set to make its own energy efficient ARM Server chip unruh <unruh@invalid.ca> - 2013-12-17 00:10 +0000
                Re: Google set to make its own energy efficient ARM Server chip Lusotec <nomail@nomail.not> - 2013-12-17 03:30 +0000
                Re: Google set to make its own energy efficient ARM Server chip unruh <unruh@invalid.ca> - 2013-12-17 03:48 +0000
                Re: Google set to make its own energy efficient ARM Server chip 7 <email_at_www_at_enemygadgets_dot_com@enemygadgets.com> - 2013-12-17 18:44 +0000
                Re: Google set to make its own energy efficient ARM Server chip unruh <unruh@invalid.ca> - 2013-12-17 19:42 +0000
                Re: Google set to make its own energy efficient ARM Server chip Thad Floryan <thad@thadlabs.com> - 2013-12-17 12:23 -0800
                Re: Google set to make its own energy efficient ARM Server chip unruh <unruh@invalid.ca> - 2013-12-18 00:19 +0000
                Re: Google set to make its own energy efficient ARM Server chip unruh <unruh@invalid.ca> - 2013-12-18 00:34 +0000
                Re: Google set to make its own energy efficient ARM Server chip David Brown <david.brown@hesbynett.no> - 2013-12-18 11:06 +0100
                Re: Google set to make its own energy efficient ARM Server chip Frank Miles <fpm@u.washington.edu> - 2013-12-18 16:18 +0000
                Re: Google set to make its own energy efficient ARM Server chip 7 <email_at_www_at_enemygadgets_dot_com@enemygadgets.com> - 2013-12-18 19:19 +0000
                Re: Google set to make its own energy efficient ARM Server chip David Brown <david.brown@hesbynett.no> - 2013-12-19 10:05 +0100
                Re: Google set to make its own energy efficient ARM Server chip 7 <email_at_www_at_enemygadgets_dot_com@enemygadgets.com> - 2013-12-19 20:45 +0000
                Re: Google set to make its own energy efficient ARM Server chip David Brown <david.brown@hesbynett.no> - 2013-12-20 09:40 +0100
                Re: Google set to make its own energy efficient ARM Server chip 7 <email_at_www_at_enemygadgets_dot_com@enemygadgets.com> - 2013-12-20 20:55 +0000
                Re: Google set to make its own energy efficient ARM Server chip David Brown <david.brown@hesbynett.no> - 2013-12-19 09:54 +0100
                Re: Google set to make its own energy efficient ARM Server chip unruh <unruh@invalid.ca> - 2013-12-17 19:40 +0000
    Re: Google set to make its own energy efficient ARM Server chip Les Cargill <lcargill99@comcast.com> - 2013-12-14 18:15 -0600

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