Nagios active check performance limits

[Gaspar, Carson]

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!)

>-----Original Message-----
>From: nagios-devel-bounces at lists.sourceforge.net 
>[mailto:nagios-devel-bounces at lists.sourceforge.net] On Behalf 
>Of Gaspar, Carson
>Sent: Friday, November 09, 2007 11:47 AM
>To: 'nagios-devel at lists.sourceforge.net'
>Subject: SPAM WARNING!: [Nagios-devel] Nagios active check 
>performance limits
>
>I sent this to -users earlier, but it's probably more 
>appropriate for -devel.
>
>FYI I just re-ran my tests with 3.0b6 and am seeing about the 
>same results. 
>
>(Disclosure - I'm giving an invited talk at LISA next week on Nagios)
>
>I'm trying to determine the maximum active check rate that 
>Nagios can sustain on a given system. I'm rather surprised 
>that I can't seem to get more than about 3 checks per second. 
>Am I just being dense? (I haven't used anything but passive 
>checks for years now, so my active check foo is
>stale...)
>
>Nagios config settings (testing with 2.9, which is what we're using in
>production):
>
>service_inter_check_delay_method=0.01 (tried s as well...) 
>service_interleave_factor=s
>host_inter_check_delay_methos=0.01 (tried s as well) 
>max_concurrent_checks=0
>service_reaper_frequency=1
>sleep_time=0.01
>
>performance stats show svc execution at 0 / .8 / .459, svc 
>latency at 0 /
>10467.99 / 4475.5599 (3 hours after launch, with only 32708 / 
>50000 services
>checked)
>
>I never see more than 9 nagios procs at once. The config is 
>large (5000 hosts with 10 services each). The service checks 
>are a simple c program that sleeps for half a second then returns OK.
>
>Is this really the best Nagios can do, or am I missing something?
>
>--
>Carson
>
>---------------------------------------------------------------
>----------
>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/ _______________________________________________
>Nagios-devel mailing list
>Nagios-devel at lists.sourceforge.net
>https://lists.sourceforge.net/lists/listinfo/nagios-devel
>
>WARNING! The attached email has been filtered as possible 
>spam. Please review at your own discretion. 
>
>For additional info: <<http://infosec.web.gs.com/faqs/spam.shtml>>
>
>Cogentrix users go to http://cgxapp/mailinfo for further instructions.
>
>TIP: Don't unsubscribe from spam e-mail.  Unsubscribing 
>confirms to the spammer that a guessed e-mail address is real, 
>and may cause you to receive even more spam.
>
>

-------------------------------------------------------------------------
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/