big performance issue with Nagios 2.5

[Marcel Mitsuto Fucatu Sugano]

On Wed, 2006-12-13 at 08:32 +0100, Daniel Meyer wrote:
> On Tue, 12 Dec 2006, Daniel Meyer wrote:
> 
> > On Mon, 11 Dec 2006, Mike Holloway wrote:
> >
> >> In nagios.cfg, what values are you using for service_reaper_frequency
> >> and sleep_time?  I'm using service_reaper_frequency=5 and
> >> sleep_time=1 for about 10 hosts and 200 services.  You might need to
> >> adjust your service_reaper_frequency down from the default with as
> >> many services as you are checking.
> >
> > My settings are:
> >
> > service_reaper_frequency=5
> > sleep_time=0.25
> 
> Hm, upgraded to Nagios 2.6, the problem is still there...
> 
Do you have passive and active checks? What is the ratio between them?
I've runned across this issue, and had to tweak with main config values
to solve the problem.

To me, when i've came to this problem, the number of passive checks were
way beyond the number of active checks, and seemed that when a lot of
passive checks were being processed, the active checks begins to delay
execution, the latency begins to raise, and only restarting nagios to
get some performance again, until the burst of passive results coming
and Nagios being way too busy for executing active checks. The number of
nsca instances was very high and when i've changed the value at
command_check_interval from -1 to 2, the latency lowered.

So, IMHO, i think it's a question of configurations tests to get
performance tunned.

HTH,
Marcel


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