right axis with different start/stop

[Alexander Skwar-6]

Hi.

In the manual, I found the --right-axis option and am curious in how
to use it.

I would like to draw idle CPU usage (with values 0..100) on one y-axis
(the left one) and some "application performance" values which has
values 1000..10000.

How would I need to set the scales?

If I'd only have one y-axis, I'd use --upper-limit 10000 and --lower-limit 1000.
But doing that, the CPU values wouldn't be shown; or I'd set the limits
to 0 and 100 - but then, the app perf. values would be out of range... :(

What would be the best way to go about this, using the current RRDtool
version on Solaris 10?

Thanks a lot,
Alexander
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[Tobias Oetiker-3]

Hoi Alexander,

Today Alexander Skwar wrote:

> Hi.
>
> In the manual, I found the --right-axis option and am curious in how
> to use it.
>
> I would like to draw idle CPU usage (with values 0..100) on one y-axis
> (the left one) and some "application performance" values which has
> values 1000..10000.
>
> How would I need to set the scales?
>
> If I'd only have one y-axis, I'd use --upper-limit 10000 and --lower-limit
> 1000.
> But doing that, the CPU values wouldn't be shown; or I'd set the limits
> to 0 and 100 - but then, the app perf. values would be out of range... :(
>
> What would be the best way to go about this, using the current RRDtool
> version on Solaris 10?

note that the right axis has to be configured based on the left
axis, you can shift and scale it ...

as for the content of the graph, you have to use CDEF to adjust
position and size of something like CPU. The reason for this is
that I want the grid to be true for both axis and this is only
possible when they are somehow coupled ...

cheers
tobi


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[Alexander Skwar-6]

Hoi Tobias!

On Tue, Jun 9, 2009 at 08:12, Tobias Oetiker <tobi@...> wrote:

>
> Hoi Alexander,
>
> Today Alexander Skwar wrote:
>
> > Hi.
> >
> > In the manual, I found the --right-axis option and am curious in how
> > to use it.
> >
> > I would like to draw idle CPU usage (with values 0..100) on one y-axis
> > (the left one) and some "application performance" values which has
> > values 1000..10000.
> >
> > How would I need to set the scales?
> >
> > If I'd only have one y-axis, I'd use --upper-limit 10000 and --lower-limit
> > 1000.
> > But doing that, the CPU values wouldn't be shown; or I'd set the limits
> > to 0 and 100 - but then, the app perf. values would be out of range... :(
> >
> > What would be the best way to go about this, using the current RRDtool
> > version on Solaris 10?
>
> note that the right axis has to be configured based on the left
> axis, you can shift and scale it ...

Okay, understood.

This brings me to another, related question:

How do you set a lower and upper limit for the left or right y-axis?
With only 1 y-axis, I'd use upper-limit and lower-limit. So, if I wanted
to see values 90..100, I'd use -l 90 -u 100. But how to do that, if y1:=90..100
and y2:=1000..10000?

> as for the content of the graph, you have to use CDEF to adjust
> position and size of something like CPU. The reason for this is
> that I want the grid to be true for both axis and this is only
> possible when they are somehow coupled ...

Okay. Would be nice, though, if it were possible to have two
y-axis lines in the graph; kinda like the way gnuplot does it.

Hm. I suppose rrdtool cannot do what I want, because the
way it's now, the two y-axis have to be somehow coupled (as
you say). But I'm looking for a way to have two completely
seperate y-axis (actually, I'd love it if one the y-axis could be
logarithmithic and the other one not - this is clearly not possible
if both axis have to be coupled somehow).

Thanks a lot,
Alexander
--
[[ http://zensursula.net ]]
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