Nagios active check performance limits

[Andreas Ericsson]

Gaspar, Carson wrote:
> After sending this I discovered the joy of the new 3.x parameter
> use_large_installation_tweaks...
> 
> Nagios is now eating all 4 of my processors, as requested. I'm not sure
> _why_, as without this setting my server was practically idle...
> 
> I'm now seeing about 13.5 checks/sec, much closer to what I expected.
> 
> Of course passive checks are processed at 1052/sec, at <25% CPU (which is
> why I use them!)
> 

Well, reading a line of text will always be a lot cheaper than forking and
running the program that produces that line of text in addition to also
reading the line of text.

It would be possible to increase the number of checks Nagios is capable of
doing by rewriting the command execution engine to multiplex the checks
directly rather than using the multi-fork() dogma of today, but it's a huge
core modification and fairly complex, so I haven't bothered so far.

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231

-------------------------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc.
Still grepping through log files to find problems?  Stop.
Now Search log events and configuration files using AJAX and a browser.
Download your FREE copy of Splunk now >> http://get.splunk.com/