[CentOS] CPU usage over estimated?
Les Mikesell
lesmikesell at gmail.com
Fri Jun 5 17:44:44 UTC 2009
nate wrote:
>>
> I wrote a few scripts that get CPU usage and feed it into SNMP for
> retrieval for my cacti systems.
>
> My company used to rely on the built in linux SNMP stuff for cpu
> usage(before I was hired) and they complained how it always seemed
> to max out at 50%(on a dual cpu system).
>
> I've been using my own methods of CPU usage extraction using sar
> for about 6 years now and it works great, only downside is sar
> keeps being re-written and with every revision they make it harder
> and harder to parse it(RHEL 3 was the easiest by far).
>
> Sample graph -
> http://portal.aphroland.org/~aphro/cacti-cpu.png
>
> That particular cacti server is collecting roughly 20 million data
> points daily(14,500/minute). *Heavily* customized for higher
> scalability.
Have you looked at OpenNMS for this? It's java with a postgresql
backend for some data and jrobin (equivalent to rrd) for some. It needs
a lot of RAM and has the same i/o bottleneck as anything else updating
large numbers of rrd files but otherwise is pretty scalable and includes
a lot more features than cacti.
--
Les Mikesell
lesmikesell at gmail.com
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