[rrd-users] rrdtool backed mrtg using massive amounts of memory

[Tobias Oetiker]

Hi Steven,

Yesterday Steven Hartland wrote:

> ----- Original Message ----- From: "Tobias Oetiker" <tobi at oetiker.ch>
> >
> > have a look at iostat -x to see if there is high load on the disk
> > ... the bit where your process is taking more and more memory is
> > rather odd though ... you are using the latest version of rrdtool
> > and there is not some old copy of the perl bindings kicking around
> > your system ?
>
> Yep running the latest 1.3.7
>
> > find /usr/local/lib/perl5 -name RRDs\*
> /usr/local/lib/perl5/5.8.8/man/man3/RRDs.3.gz
> /usr/local/lib/perl5/site_perl/5.8.8/mach/auto/RRDs
> /usr/local/lib/perl5/site_perl/5.8.8/mach/auto/RRDs/RRDs.so
> /usr/local/lib/perl5/site_perl/5.8.8/mach/auto/RRDs/RRDs.bs
> /usr/local/lib/perl5/site_perl/5.8.8/mach/RRDs.pm
> >
> > grep VERSION= /usr/local/lib/perl5/site_perl/5.8.8/mach/RRDs.pm
> $VERSION=1.3007;
>
> As far as iostat is concerned I cant tell ATM as it seems random as
> to if it will misbehave or not. But it is the only thing running
> so if it is high load it will due to this process. In addition
> when this happens CPU load is very high for the perl process.
>
> I can however say that when combined with the other rrd updates
> running on the box it is enough to saturate the IO on the machine
> causing multi second stalling at certain times.
>
> This was one of the things I hoped upgrading to 1.3 with mmap
> would reduce but no joy.
>
> The machine itself is hardly a small with a 6 disk areca 1120
> configured in RAID 6 and only running mrtg and rrdtool backed
> server stats.

well RAID 6 is not going to help performance at all ... it will
help reliability ... (a good thing too).

apart from that I do not have magic hints at the moment ... sorry
tobi

>    Regards
>    Steve
>
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-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900