[mrtg] Re: Cron or deamon

[Jerry Heidtke]

An additional consideration is that if you modify a config file, with cron
the modifications take effect automatically the next time that task is
executed. Running as daemon requires the daemon to be manually restarted for
the changes to be used.

I have 14 separate mrtg tasks started by cron each five minutes. These
configs simply set some global options and then include from 5 to 20 configs
for specific devices. I haven't seen any large performance hit from having
to start perl that often. Of course, CPU spikes to 100%, but only for a few
seconds. This is on a Compaq server, 1.4 MHz P4 running Windows 2000. The
server is also running a bunch of other management-related software, such as
Insight Manager 7, Web JetAdmin, and Big Brother.

All in all, I've found that using cron allows more control and
manageability. I use the cron service from aintx.

Jerry

-----Original Message-----
From: Ambrose Li [mailto:a.c.li at ieee.org]
Sent: Tuesday, November 19, 2002 7:55 PM
To: Rowan Reid
Cc: mrtg at list.ee.ethz.ch
Subject: [mrtg] Re: Cron or deamon



Back a number of months ago I tried both. My observations
(biased towards running mrtg on a "slower" machine and a
network with relatively "lighter" traffic):

The cron way to run mrtg generated graphs that are more "spiky",
I suppose because starting perl every x minutes would place a
heavier load on the system, so that's the "con" for the cron
way. The "pro" would be that you are guaranteed when the stats
are gathered.

The daemon way generated graphs that are smoother, apparently
implying that it places a much lighter load on the system -- for
a slow machine this makes perfect sense -- so that's the "pro".
The "con" is that if you restart mrtg once in a while, the stats
are gather at unequal intervals.



On Tue, Nov 19, 2002 at 03:53:08PM -0800, Rowan Reid wrote:


> Whats the best way to run mrtg, I noticed the readme specified
> a run as deamon option, is there an advantage to this ?
> Secondly, does mrtg get the max throuput variable from snmp
> etc, or is it specified
>

-- 
Ambrose Li  <a.c.li at ieee.org>
http://ada.dhs.org/~acli/cmcc/  http://www.cccgt.org/

DRM is theft - We are the stakeholders

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