latency and parallelize check

[Trask]

On 4/27/06, Sandeep Narasimha Murthy <sandeep-n-murthy at telecom.pt> wrote:
> <snip>
>
> What about latency, any suggestions on how I can better it !?
>

I'm very interesting in this, too.  Is there any information as to
what each of the "performance" stats really mean?  I'll preface by
saying I have not gotten around to setting up any external performance
monitoring...

Here are some more specific questions to get things started:

The 4 tables on the left side of the "Performance Info" page have 2
columns -- "Time Frame" and "Checks Completed".
1) Does the "Time Frame" start from when a check is scheduled or from
what it actually starts?
2) If nagios has been running > 24 hours and I still have less than
100% "checks completed" for the "since program start" row, what does
this mean?  Do I have checks that are never ruturning (doesn't seem
possible given the built-in timeouts).  Are there checks that are
getting used that are getting factored in?

Metrics:
3) Does "check latency" mean how long after a check is scheduled that
nagios gets the result?  Or after it has completed?  Or after the
check has started?  (For reference:
http://nagios.sourceforge.net/docs/2_0/checkscheduling.html )
4) Cleary, we want lower execution times and low latencys -- what are
people who are satisfied with the performance of their setup seeing
for these numbers?

General:
5) Is there any way built in to nagios to get performance data on each
check for ALL hosts? This is in the spirit of "checking the check" to
see if it is performing reasonably well as well as serving as a basis
to compare the performance of different checks against one another (o
r comparing the difference between a compiled plugin's performance
verus a non-compiled one).
6) Any suggestions for 3rd party addons, plugins, etc that could help
shed some light on to these performance questions?

~trask


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