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MathGroup Archive 2004

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Re: Energy content of a mathematical result.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg48657] Re: Energy content of a mathematical result.
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Wed, 9 Jun 2004 04:17:41 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

On 6/8/04 at 12:48 AM, Matthias.Bode at oppenheim.de wrote:

>is there a theory - or hypothesis - which share of the processors
>energy consumption goes into the result when e. g. a system of
>equations is being solved or a list is being subjected to Sort (by
>Mathematica)? - The processors output cannot be just 100 per cent
>hot air.

I am not sure I understand your question.

On Mac OS X with a third party app installed when I exectute

data = Table[Randomp[], {5 10^6}];
Timing[Sort[data];]

third part app shows me the percentage of cpu cycles consumed by user processes goes from flucuating between 0-4% to flucuating between 98-100% while the sort is happening. I assume energy devoted to a specfic process would correspond to the number of cpu cycles consumed by that process. In other words, I expect the percentage of cpu cycles used equals the percentage of energy used.

This (admittedly quick) experiment indicates to me, Mathematica consumes all or nearly all of the available energy at times for functions such as Sort.

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