18000 services to check and Nagios just sits and waits.

[Attilio Poleggi]

>From your question it seems tha Nagios can't start
more than 4-6 processes.. very strange: usually it
starts hundreds of checks. 

What can you say about "scheduling queue" ? Are all
checks correctly scheduled ? And, if so are them
orphanized (you should enable "orphanize" option to
understand it)? or they just wait in latency?

If Nagios configuration is OK ( max_concurrent_checks
and so on) you can try to glance at Linux kernel
parameters (i.e. "ulimit" and others).

Good luck
A


--- martin at idefix.net wrote:
> Hi all,
> 
> I'm trying to convince Nagios it should perform very
> aggressively
> but somehow it won't work. 
> When reading the documentation it states everywhere
> that Nagios
> will consume all CPU power you throw at it if you
> don't take care.
> Well, with me it doesn't and I really want it to.
> 
> The situation:
> - All our machines send some email to the Nagios
> server which 
>   we put in files and wrote a plugin to check those
> files.
> 
> - There are a lot of machines (almost 900) and we
> want to do a lot
>   of checks (18000).
> 
> - To make it worse, we forced Nagios to use MySQL
> for the service_status
>   and host_status data (as we created our own
> frontend and use MySQL as
>   the interface).
> 
> To make sure Nagios will be able to abuse the
> hardware as much as it can
> we threw in a dual xeon 3 GHz machine with 2GB
> memory and some 15k RPM
> SCSI disks. To make it better, Linux understands
> hyperthreading and
> makes it a total of 4 CPU's.
> To prevent MySQL to abuse the arraycontroller to
> much we make the
> service_status and host_status tables HEAP so they
> only use memory.
> 
> I would assume that Nagios would at least try to
> fork something like
> 40 to 100 processes and would consume at least one
> CPU but it doesn't.
> It won't abuse the memory either as there is about
> 1GB of memory left.
> 
> It only seems to be sitting there with 4 to 6
> proccesses and allowing
> the latency to go up and up like there's no
> tomorrow. Or at least there
> won't be any checks tomorrow.
> 
> We've tried both the smart Nagios options as the
> dumb options and
> event tried to think ourselves and calculating the
> right configvalues
> but nothing seems to work.
> 
> So, if anyone has a clue, please share it with me.
> :)
> Thanks so far,
> Martin
> 
> 
> 
> 
> -- 
> Tin will not rust or give in but melts directly when
> heated =B-)
> 
> 
>
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