[rrd-users] Re: how does rrdgraph pick which points to graph

[Britt Houser]

Even if I don't have the a RRA setup for the 30 min interval?  So it
does this calculation on the fly?  If so, is there a big performance hit
todo this?

thx,
britt

On Thu, 2003-07-10 at 15:37, PAUL WILLIAMSON wrote:
> It picks the data points that are appropriate for the interval you
> request.
> 
> If you want 5 minute values in your graph, but are asking for 2 weeks 
> worth of data (and don't have the right resolution), RRDTool will pick
> the 
> 30 minute values and display those.
> 
> Paul
> 
> >>> Britt Houser <houser at cisco.com> 07/10/03 03:32PM >>>
> Let say I have 1000 data points in my rrd, and I create the default
> graph which is 400 pixels wide.  How does rrd tool 'summarize' 1000
> data
> points into 400?  Is each point an average? or does it just pick out
> every 2.5 points and displays that one?  Something more complex?
> 
> thx,
> britt
-- 
Britt Houser - Software Engineer
Cisco Systems, Inc
Phone:    (919) 392-6258
Email:    houser at cisco.com
A/N Page: bhouser at epage.cisco.com

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