Nagios scheduling question

[william(at)elan.net]

Thanks for the pointer, I heard about DNX but did not look at it closely
yet, I'll take a look. However I've bad feeling the company I'm setting 
it for would not like it because its listed as "alpha" software; also
DNX is more for "distributed" monitoring where as there everything runs
on same box.

I'm more interested in learning how nagios decides how many processes
it can run based on system load so as to try to tune it to have more
processes & service checks done simultaneously.

On Tue, 27 Mar 2007 bobi at netshel.net wrote:

> Have you checked out the Distributed Nagios eXecutive (DNX) at Source Forge?
>
> The purpose of this project was to increase service check capacity and
> throughput by creating a multi-threaded and distributed service check
> architecture around Nagios (it's based on Nagios 2.7)
>
> Bob
>
>>
>> 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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