Nagios service latency

[Thomas Guyot-Sionnest]

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On 04/11/07 11:48 AM, Andreas Ericsson wrote:
> Thomas Guyot-Sionnest wrote:
>>
>> This gives the same result for up hosts, but takes 20 times longer on
>> unreachable hosts:
>>
>> $ time ./check_icmp -H 1.1.1.1 -w 300.00,80% -c 500.00,100% -p 1 -t 1
>> CRITICAL - 1.1.1.1: rta nan, lost 100%|rta=0.000ms;300.000;500.000;0;
>> pl=100%;80;100;;
>>
>> real    0m0.506s
>> user    0m0.000s
>> sys     0m0.004s
>> $ time ./check_host -H 1.1.1.1
>> CRITICAL - 1.1.1.1: rta nan, lost 100%|rta=0.000ms;1000.000;1000.000;0;
>> pl=100%;100;100;;
>>
>> real    0m10.006s
>> user    0m0.000s
>> sys     0m0.000s
>>
>> So it's definitely not an option. I could further reduce the timeout by
>> using lower thresholds but I wanted to stay on the safe side...
>>
> 
> You have check_attempts set to 1 for your hosts? Doesn't that generate an
> awful amount of false positives?

Max check attempts is set to three. According to Nagios documentation
it's much more performant to have a faster host check and more check
attempts than one check attempt that takes longer (i.e. sending multiple
packets).

The performance problem people usually get is not related to server
performance (i.e. number of forks, cou used, etc) but the time Nagios
spend waiting for host check results (as it's doing nothing else during
that time).

Thomas

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