[rrd-users] More comfortable chart display

Martin Sperl rrdtool at martin.sperl.org
Sun Jan 25 17:27:16 CET 2009

Well, Alex - there is an approach for you...

As for graphv, nice - it gives the basic information and could be used 
to add this information external to rrdtool - I still think it would be 
"nicer" to have rrdtool do it in a standardized way without having to 
reinvent the wheel repeatedly...

On closer inspection I would say that something is missing from the 
output of graphv, which could introduce problems: the min/max time is 
not given!
Imagine, that we create an initial graph with the parameters: "--start 
-2weeks --end now" the javascript also would need to translate "-1week" 
and "now" back to a real time and it could do it differently  than 
rrdtool (e.g: using the wrong timezone for conversion, or the more 
complex translation cases that rrdtool handles "-1day+6hours", ...)

So maybe we should add this to the output of graphv as well for 

Otherwise we will again need to add it separately by calling RRDs::times 
and "enriching" the graphv output  with this information. But then as 
this is 2 different calls to RRD, you will potentially get slight 
deltas, depending on the sequence and the complexity of the graphs 
(graphs with more than 1000 DEFs take some time to generate;)


Tobias Oetiker wrote:
> Hi Martin,
> as for the javascript part, there is code for this in smokeping ...
> getting more meta information from rrdtool is also implemnted
> through the graphv call.
> check it out!
> cheers
> tobi

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