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

[Christian Convey]

Thanks.  I figured the Nyquist rate would come into play here.  What I
figured I'd do is first get the system running with the best sampling
rate I could reasonably afford, and then work out the error statistics
later on in my analysis.

On Wed, Oct 19, 2011 at 8:42 AM, Manuel Wolfshant
<wolfy at nobugconsulting.ro> wrote:
> 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
>
>
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