[op5-users] Check lantency with merlin

[Joerg Linge]

Joerg Linge schrieb:
> 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.

OK, next graph

http://www.pnp4nagios.org/merlin_latency-2.png

11:40 - 13:30 merlin.so running with "return 0;" after hook_service_result() an hook_host_result()

13:30 - 15:10 orignal merlin.so

Cheers Joerg