[mrtg] Performance

[Jakub M]

worked, thanks!
(13 sec, without forks :)

2008/11/18 McDonald, Dan <Dan.McDonald at austinenergy.com>:
> On Tue, 2008-11-18 at 20:34 +0100, Jakub M wrote:
>> Also, I am running MRT from /etc/cron.d as multiple entries every 5
>> minutes - is it OK? I mean, I have dozens of entries in cron.d,
>
> you are, therefore, loading dozens of copies of perl every 5 minutes.
> That chews up ram, and if you run out, then the box swaps.  swapping is
> bad for performance.
>
>
>> maybe
>> it is better to run it as a single MRTG run (with a terribly long
>> command line?)
>
>
> No, my command line is very short:
> [mcdonalddj at ldap cfg]$ sudo cat /etc/cron.d/mrtg
> */5 * * * * mrtg /usr/local/bin/mrtg /var/mrtg/cfg/mrtg.cfg
> --logging=mrtg.log
>
> but mrtg.cfg is very large.  It is full of Include: statements, e.g:
>
> Include: /var/mrtg/cfg/common.cfg
> Include: /var/mrtg/cfg/sitea/sitea-router1.cfg
> Include: /var/mrtg/cfg/sitea/sitea-router2.cfg
> Include: /var/mrtg/cfg/sitea/sitea-ups1.cfg
> ...
>
> In common.cfg, I have all of the standard things, like LogDir:, HtmlDir:
> and ImageDir:, the forks: declaration, and LogFormat: rrdtool
>
> mrtg farms out the polling amongst the 30 forks, then does the disk
> writes sequentially so as to minimize disk collisions.
>
>
> --
> Daniel J McDonald, CCIE #2495, CISSP #78281, CNX
> Austin Energy
> http://www.austinenergy.com
>
>
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