[rrd-users] PREDICT: How does it work?

Martin Sperl rrdtool at martin.sperl.org
Wed Oct 20 15:39:12 CEST 2010


t0/t1/... is just the timestamp for which you are calculating the "prediction".

The Computation made is: F(t0)=AVG[ (t0-shift1-window ; t0-shift1) ; (t0-shift2-window;t0-shift2);... ]

For other Predictions you have to use Holt-Winters forcasting during Data gathering, but I have never used it (especially for Graphing)...


On 20.10.2010, at 10:08, Etienne-Marie de Boissieu wrote:

> I use the PREDICT function but i don't understand the operations made by rrd.
> I have several questions: 
> -How does rrd set t0 and what is gap between NOW and t0?
> -What is the comptutation made by rrd?
>  Is it (for value at sample t0):
>    Avg[ Avg(t0-shift1-window ; t0-shift1) ; Avg(t0-shift2-window;t0-shift2) ]
> Is it the only operation made by rrd for getting  prediction?
> Thanks
> Etienne Marie
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