[Nut-upsuser] Newbie question: real-time power usage monitoring?

[Manuel Wolfshant]

On 10/19/2011 03:40 PM, Christian Convey wrote:
> Thanks for the ideas.
>
> You're right - I *am* looking for total energy expenditure (Joules,
> Watt-hours, etc.)  I have no specific desire to do that integration in
> my own code.
>
> As far as sampling frequency, here's the deal:  I'm working on a
> system to estimate the power draw associated with a run (or set of
> runs) of an arbitrary program on my Linux computer.  Some of the
> program runs will be brief, but I'm not sure how brief we're talking.
> I'm no statistics expert, but I believe my power-draw estimates will
> get pretty inaccurate unless the sampling rate is markedly higher than
> the program's running time.  I *can* limit my studies to programs that
> run for a long time (so as to reduce the relative error stemming from
> a slow-sampling power meter), but that would put an unwelcome
> limitation on my research.
http://en.wikipedia.org/wiki/Sampling_rate
mind the Nyquist–Shannon sampling theorem