[rrd-developers] Re: Implementing TOTAL

[Alex van den Bogaerdt]

Mark Mills wrote:

> > What would be the prefered way to handle unknown intervals?  There
> > are two options as far as I can see:
> > 
> > 1) average(all rates)*timespan(graph)
> > 2) sum(for each defined interval:(rate*stepsize))
> > The difference would be the unknown intervals.  In the first case
> > unknown intervals are assumed to be at the average rate, in the
> > second case unknown intervals are assumed to be zero.
> 
> Do both? TOTALSUM, TOTALAVG are really ugly suggestions for names. =)

They're not clear to me and this is within context :)

> Or alternately make TOTAL a raw sum and supply a COUNT and STEPS so we
> can calculate it manually?

We could have "preset" VDEFs such as timespan (number of seconds graphed).
This could then be multiplied by the calculated average and thus provide
the total as calculated using option 1 above.
    VDEF:total=ds,AVERAGE,timespan,*
This requires being able to use real RPN in VDEF commands, something
that needs to be done anyway but it is currently not implemented.

Option 2 could be implemented by doing
   VDEF:total=ds,TOTAL

Apart from calculating the total, is there any other need to know how
many intervals were unknown or not?

Thanks for the input, I really appreciate it.
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