[rrd-users] Multiple Updates Per Second

[Tobias Oetiker]

Today Steve Shipway wrote:

> > I've tried threading the updates using Perl threads, and the best I can
> > achieve is about 20 per second.  This is doing system calls to rrdtool
> > update.  I've tried the RRDs perlmod, but it crashes with a segfault

RRDs crashing with a segfault is not a good thing ... are you using
the latest version of rrdtool ?

also, as an alternative, you could

open my $rrd, '|-', '/usr/bin/rrdtool','-';
while(1){
  print $rrd "update ...\n";
}

or even use open2 to get rrdtools responses too.

cheers
tobi




> We have rrdcached here, and are easily managing 50-60 updates per
> second (over 15,000 RRD files).  You should be able to handle
> much more.
>
> Possibly you need to make sure you have enough resources to
> rrdcached, that it can open enough FDs, and have enough listen
> queue on the TCP (or are you using a UNIX socket?)
>
> You could also increase the various params to rrdcached to
> increase the caching times.
>
> You don?t say if the updates are blocking, failing, or simply
> running slowly.  I assume you've checked that the disk IO and
> CPU/mem are not the bottleneck?
>
> Steve
>
>
>
> Steve Shipway
> ITS Unix Services Design Lead
> University of Auckland, New Zealand
> Floor 1, 58 Symonds Street, Auckland
> Phone: +64 (0)9 3737599 ext 86487
> DDI: +64 (0)9 924 6487
> Mobile: +64 (0)21 753 189
> Email: s.shipway at auckland.ac.nz
> ? Please consider the environment before printing this e-mail
>
>
>

-- 
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