how is "Service check Latency" defined in nagios?

[Max]

Rahul,

On Mon, Feb 9, 2009 at 2:53 PM, Rahul Nabar <rpnabar at gmail.com> wrote:
> Thanks Marc. I have: max_concurrent_checks=0

Our experience has been that with max_concurrent_checks set to 0 and
inter-check delay and nagios sleep set very low we get high reported
service check latencies as we are basically asking Nagios to try and
run everything as soon as possible ... 1000s of checks over a few
seconds in essence ... which it can't do.   As far as 'real life'
negative impact the high latency in this singular case hasn't meant
much; it initially really worried me until i realized that the high
service latency is just happening because we are basically telling
nagios to pause / sleep / wait for as little time as possible and run
things as quickly as possible.  We have around a 146 second service
check latency but from our detailed Nagios metrics we see that check
runs are completing in right around 4 minutes, under our 5 minute
hard-ceiling (around 6000 checks).  our PNP performance graphs prove
our suspicions .. our reporting server receives 6000 metrics in 4
minutes or less and we have no gaps in our graphs or major under or
over sampling problems with the data we retrieve from our remote
agents.

I only bring that up because if you not only have
max_concurrent_checks set to 0 but also have tuned way down
inter-check delay settings and sleep time you might be encountering
the same situation and the high latency might not be something to
worry about .. but only IF you have all your delays tuned very low and
no ceiling on max checks.  for any other situation it is definitely
something to investigate.

- max

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