[rrd-users] Malloc error when creating graph (Debian on NSLU2/ARM)

[Tobias Oetiker]

Richard,

one idea that just occurs to me is that maybe by reducing the time
span a smaller higher resolution RRA gets picked from your rrd and
this actually leads to MORE date eventouch the time span is shorter
...

for testing, try an rrd with only one RRA

cheers
tobi

Today u7l11ey at mail.lrz-muenchen.de wrote:

> Hi all,
>
> I get a strange error when creating a graph. My system is a Linksys NSLU2
> running Debian (Linux slug 2.6.18-5-ixp4xx #1 Sun Dec 23 05:17:39 UTC 2007
> armv5tel GNU/Linux), I'm using rrdtool 1.2.15. The same problem has also
> been reported for 1.2.23, see ticket #111 on the rrdtool website.
>
> This is the graph definition:
>
> rrdtool graph temperatur4.png \
> --end now --start end-48799 -a PNG -t "Temperaturverlauf 4h" \
> --vertical-label "Temperatur °C" \
> --width 800 --height 400 \
> DEF:aussen=temperatur.rrd:AF:AVERAGE \
> CDEF:aus=aussen,10,/ \
> LINE1:aus#ff0000:"Aussen"
>
> Running it produces "ERROR: malloc im->gdes[gdi].data". Notice the
> parameter "--start end-48799": The error happens for any values of the
> subtractor below 48800! Any values equal or above 48800 will produce the
> graph as desired. It also works if the "CDEF" or the size definition is
> omitted, but that is not what I want.
>
> I am confused since a graph containing a larger time span shoud use more
> resources and therefore be more likely to fail. But in this case, it fails
> if the graph contains a shorter time span.
>
> Is anybody running rrdtool on their NSLU2 and also having similar problems
> and/or a solution? I'll be happy to supply a complete test case if it
> helps.
>
> Regards, Richard
>
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>

-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten
http://it.oetiker.ch tobi at oetiker.ch ++41 62 213 9902