[rrd-users] Re: Dynamic HRULE?

[Alex van den Bogaerdt]

On Fri, Sep 01, 2006 at 06:47:26PM +0200, Cedric Lejeune wrote:

> |
> |----------------------- <- max ever found
> |          _
> |  __     | |_     _
> |_|  |    |   |___| |___ <- "current" processes
> |    |____|
> |_______________________
> 

max ever, so should not depend on the current time window.
Get this value using an extra rrdtool call.
Use PRINT, to print the maximum of all maximums.

The resulting number can then be used in your second call to
rrdtool, in other words you will be dynamically modifying your 
grapher script.

(I don't debug this; that's a job for you):

maxval=$( rrdtool graph whatever
    --start [suitable start time]
    --end now
    DEF:ds0=spamd.rrd:spamdProcesses:MAX
    PRINT:ds0:MAX:%6.2lf
)

rrdtool graph eyecandy.png 
    --start end-24h
    --end now
    DEF:ds0=spamd.rrd:spamdProcesses:AVERAGE
    HRULE:$maxval#FF0000:maximum\ ever
    LINE1:ds0#0000FF:current

HTH
-- 
Alex van den Bogaerdt
http://www.vandenbogaerdt.nl/rrdtool/

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