[rrd-users] Re: Area under graph?

[Simon Mullis]

Thanks for this Serge.

Is there an easy way to express the timespan as a variable or output from
RRDTool to then output via PRINT or GPRINT?  I am using a web form with a
fairly free method of entering the start and end times and I think I would
have to redevelop the pages if I had to express the time in a way that would
allow me to convert into seconds easily. (I am using RRDcgi)

Many thanks in advance for any tips or help from anyone.

SM

-----Original Message-----
From: Serge Maandag [mailto:serge.maandag at staff.zeelandnet.nl]
Sent: 25 November 2002 19:49
To: Simon Mullis; rrd-users at list.ee.ethz.ch
Subject: RE: [rrd-users] Area under graph?


Use a cdef to multiply the bandwidth by the total timespan of the graph and
gprint that cdef.
If you need the value in your script, you could PRINT it i.s.o. GPRINTing
it.

So something like:

$timespan = 86400

def:bps=.....path to ds...
cdef:bytes=bps,$timespan,*
PRINT:bytes:AVERAGE:....

Serge Maandag

-----Original Message-----
From: Simon Mullis [mailto:Simon.Mullis at equinoxsolutions.com]
Sent: Monday, November 25, 2002 8:20 PM
To: 'rrd-users at list.ee.ethz.ch'
Subject: [rrd-users] Area under graph?




Hello all...

OK, I'm using rrdcgi and have written a few web pages that allow the dynamic
input of the start / end date or time for the graph generation.

My question is quite simply:

How can I calculate the total area under a graph?  In this case I am
interested in the total amount of traffic transferred in a time period.

I have the average, from 

GPRINT:<var>:AVERAGE: ....

And I have the time period as a CGI variable.

Can I simply multiply them together to get the total traffic transferred?
Is there a better way to do it?  Is there an undocumented :TOTAL: variable?

Help and Thankyou!

SM

Simon Mullis
Service Development Consultant
simon.mullis at equinoxsolutions.com
Equinox Converged Solutions Ltd
Tel: +44(0)1252 405 600
Mob: +44(0)7766 087170
http://www.equinoxsolutions.com



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