[collectd] Collectd and load average

Valentino Volonghi dialtone at gmail.com
Mon Apr 20 20:30:41 CEST 2009

Hello, I'm running collectd 4.6.0 on a set of machines
(one process per machine monitoring only the
machine it's running on).

Usually the process doesn't increase load and all the servers
remain at reasonable load values. For some reason though
every once in a while one of them starts ramping up in load
average up to more than 2 load average values for the 1 minute
I've also seen collectd using up to 90% CPU in those conditions,
which seems to me completely wrong.

Collectd is running on an EC2 Ubuntu 8.04
with kernel, the installed versions of the needed
plugins are all the ones that ship in that ubuntu by default, and sice
I've read in the past that librrd might be the one responsible for this,
it is running with version 1.2.19-1ubuntu1. Here's the config:

Hostname    "localhost"
Interval     10

LoadPlugin logfile
LoadPlugin syslog

LoadPlugin cpu
LoadPlugin cpufreq
LoadPlugin df
LoadPlugin disk
LoadPlugin interface
LoadPlugin load
LoadPlugin memory
LoadPlugin network
LoadPlugin processes
LoadPlugin rrdtool
LoadPlugin swap
LoadPlugin tcpconns
LoadPlugin vmem

<Plugin df>
     Device "/dev/sda1"
     MountPoint "/"
     FSType "ext3"
     IgnoreSelected false

<Plugin interface>
	Interface "eth0"
	IgnoreSelected false

<Plugin rrdtool>
	DataDir "/opt/collectd/var/lib/collectd/rrd"
	CacheTimeout 120
	CacheFlush   900

<Plugin tcpconns>
	ListeningPorts false
	LocalPort "80"
	RemotePort "*"

Valentino Volonghi aka Dialtone
Now running MacOS X 10.5
Home Page: http://www.twisted.it

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