Nagios scheduling question

[william(at)elan.net]

I have an issue with one of the client nagios installations where
nagios is executing checks too rarely and all the options to tune it
I've tried did not help. Currently they have 2500 services on about
120 hosts and nagios seems to execute checks about every 8-9 minutes
where as what is needed is about every 3-4 minutes. I've tried manual 
tuning with setting 'service_inter_check_delay_method' (I set it to
0.05 which is even more aggressively then needed, but it did cause
slight  improvement over 's') and 'service_interleave_factor' (tried 
setting it to '1' and '2' but results were worse). Now as far as I
can tell the issue is not scheduling (which nagios does correctly 
within range I want) but time of service check execution which is on 
average 1.5 seconds and nagios does not want to run more concurrent 
processes.

Now the question I have is how to best deal and tune it both using
current config options and assuming that if I'm pointed to right
direction that I'd be willing to look at source code and see if
it can be improved in some way.

On a related note I was looking at the source code and before
I always thought nagios was more of multi-threaded application
but based on what I can see (utils.c) it does multi-process
execution creating new process for each service check (my_system
function). Is there any interest in improving it? What I'm
particularly interesting is having several worker threads
capable of executing embedded perl plugins and without going
through creation of new process every time.

-- 
William Leibzon
Elan Networks
william at elan.net

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