[op5-users] Check lantency with merlin

[Joerg Linge]

Andreas Ericsson schrieb:
> Joerg Linge wrote:
>> Hi List,
>>
>> just tested merlin for about 4 days.
>> The check latency rises from 0.2s to 2.3s while merlin is running.
>>
>> http://www.pnp4nagios.org/merlin_latency.png
>>
>> Is this a known behavior? 
>>
> 
> Yes and no. Latency is expected to rise slightly to slightly higher
> but equally steady level. This is true as soon as you're loading a
> module of any kind. I hadn't expected such a high increase though,
> and I would have expected 0.2 to become roughly 0.4 or 0.5, which
> seems to hold true for the service check latency. The Merlin module
> isn't really doing very much at all, so it's strange that latency
> increases so much, and it's *very* strange that it increases such a
> lot for host checks but not for service-checks, since the two are
> handled in exactly the same way.
> 
> I wonder how much of the overhead is in Nagios. Could you try just
> inserting a "return 0" at the top of hook_host_result() and the
> same at the top of hook_service_result() in hooks.c and see if the
> pattern still holds true? If it does, I'll have a peak at Nagios
> and see if it does something strange for hostcheck callbacks that
> can be optimized. If it doesn't, I'm quite frankly stumped.

OK, done.

I will send a new graph soon.
BTW: can´t see this behavior while running ndomod on this machine.

Thanks!

Joerg