[rrd-users] Re: Help with Bash script to calc end-time in multiples of 300 ?

[Rob Conway]

OK, I systematically  went through and tested the parameters...did at least 
three observations to get run time.  All parameters as below was taking 
33-34 seconds to generate 6 graphs.

1. Changing both my start & end times to be multiple of 300 and duration of 
127800 "did nothing measurable".
2. removing "--slope" -"did nothing measurable"
3. removed --interlaced   -saved 3-4 seconds

script is 10% quicker without interlace and I cannot tell any difference 
when viewing.  I know changing the width will help however my width was 
calculated for aesthetics so I can fit two graphs side by side and two 
graphs high on my web page.  i.e. see 4 graphs on one page.



----- Original Message ----- 
From: "Alex van den Bogaerdt" <alex at ergens.op.het.net>
To: <rrd-users at list.ee.ethz.ch>
Sent: Sunday, November 19, 2006 12:11 PM
Subject: [rrd-users] Re: Help with Bash script to calc end-time in multiples 
of 300 ?


> On Sun, Nov 19, 2006 at 10:07:47AM +1100, Rob Conway wrote:
>
>> ## Aquarium PH GRAPH ##
>> rrdtool graph /website/ph1d.png --start e-1d --end $etime \
>> --upper-limit 8.0 --lower-limit 6.2 --units-length 2  \
>> --rigid --slope-mode  --width 426 --height 200 \
>> --title "pH" --vertical-label "PH" --interlaced \
>
> Change one item at a time, and try a couple of times. This makes
> sure you know the effect for each separate change, and you know
> the time needed wasn't affected by other processes that also may
> consume CPU cycles (at least: not a temporary running program).
>
> Can't comment on "slope-mode". In general: try removing options
> you don't really need. If it makes a difference, you can decide
> what is more important; if it doesn't make a difference, it is
> easy to put the option back in.
>
> (when you've tried, please do report the outcome here for future
> reference)
>
> Duration 1d and width 426.  You may want to see if this could be
> improved.  It now is 202.8169014 seconds per pixel.
>
> Assuming step==300 seconds and an RRA where steps==1step:
> Try duration 127800seconds (300*426) or width 288 pixels. Adjusting
> the width is probably better, as it will use less resources thus
> less time. I think this should help; also report back please.
>
> HTH
> -- 
> Alex van den Bogaerdt
> http://www.vandenbogaerdt.nl/rrdtool/
>
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