Nagios performance query

[Carson Gaspar]

(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

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