Nagios and Gearman - huge environment performance problem

[Rodney Ramos]

Hi Max. I´ve tried the parameters below:
 - host_inter_check_delay_method=n
 - service_inter_check_delay_method=n
 - sleep_time=0.02
Result: no difference. Thanks.

On Tue, Aug 23, 2011 at 8:06 PM, Max Schubert <maxs at webwizarddesign.com>wrote:

> On Tue, Aug 23, 2011 at 5:48 PM, Mark Goldfinch
> <mark.goldfinch at modicagroup.com> wrote:
> > On this particular point, the overall system CPU statistics displayed at
> the top of "top" are an average across all CPUs.  As previously mooted,
> Nagios core isn't multi-threaded, so it can only max a single core.  100% of
> 1/8 CPUs == 12.5% hence why you're seeing 87.5% idle time, 7 of your cores
> are not stressed out.
>
> Nagios forks a new process to execute each check - so it will take
> advantage of multiple cores as long as the kernel scheduler is working
> properly :p - on our biggest pollers we get 300-400 checks running at
> a time in parallel at any given time during the polling cycle.
>
> Some blog posts I wrote about Nagios performance that might help (some
> of the topics have been covered):
>
> http://www.semintelligent.com/blog/?q=Performance
>
> We found that changing host and service inter-check delay to 'n' for
> no delay made a big difference - also, changing sleep time to 0.02 and
> compiling Nagios with nanosleep enabled helps a lot as well - and we
> added a few additional patches to remove hard-coded sleep statements
> that were in the code that were causing Nagios to sleep more than we
> wanted.
>
> Right now on an HP DL385 we max out at about 10k checks (combo of host
> and service checks) per 5 minutes with a sustained service check
> latency of 2-3 seconds - that is a quad core host with 8 GB of RAM.
> We have latency requirements that are very specific to our environment
> - we keep all pollers at less than 10 secs service latency at all
> times.
>
> - Max
>
>
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EMC VNX: the world's simplest storage, starting under $10K
The only unified storage solution that offers unified management 
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