problems with performance of cgi's

[Stanley Hopcroft]

Dear Sir,

I am writing to thank you for your letter and say,

On Fri, Feb 13, 2004 at 10:26:02AM +0100, Marcus Hildenbrand wrote:
> Hi,
> 
> we are currently monitoring 2100 Hosts with 9900 active service checks 
> with Nagios 1.2. The main problem of that large number of monitored 
> hosts are the cgi's. Most of the cgi's need more than 30 seconds to 
> load. The current installation is running on a server with 4x700 MHz 
> Pentium 3 CPU's with 4 GB RAM running SuSE SLES 7. The check latency is 
> normally under 2 seconds and the cpu idle time is about 33%. So the 
> scheduling of the active service checks and the overall CPU performance 
> seems to be no problem.

One stupid suggestion is that if you have hacking/coding resources you
might want to have the CGIs deliver gzipped output; this may be doable
by Apache or an Apache module.

The ntop project does this (not with Apache) and the performance is very
crisp, even on very underpowered ntop hosts.

> Will the cgi's be faster in Nagios 2.0 for large configurations?
>

This change in 2.0 is aimed (IIRC) at boosting performance

'3. Daniel Drown's chained hash patch for object search functions'

- replacing linked list searches for objects with hash lookups.

If I understand corectly, this is already in the 2.0 alpha so you might
give it a pop on your P4 box.

  .. snip ..
 
> Any hints how to solve this problems,

Apart from the tuning info in the docs
(http://you/nagios/docs/tuning.html).

There have been a few letters about the performance of enormous Nag
installations (mainly about check latency IIRC); you may find that the
archives have something to offer.

> 
> Many thanks
> Marcus
> 

-- 
------------------------------------------------------------------------
Stanley Hopcroft
------------------------------------------------------------------------

'...No man is an island, entire of itself; every man is a piece of the
continent, a part of the main. If a clod be washed away by the sea,
Europe is the less, as well as if a promontory were, as well as if a
manor of thy friend's or of thine own were. Any man's death diminishes
me, because I am involved in mankind; and therefore never send to know
for whom the bell tolls; it tolls for thee...'

from Meditation 17, J Donne.


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