CPU Load and scheduling queue

[Subhendu Ghosh]

On Tue, 3 Jun 2003, louafi wrote:

>  
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> Hash: SHA1
> 
> Hi,
> 
> I have a problem with my nagios.
> 
> I have 1800 services on 130 hosts.
> 
> All my services have the same configuration :
> 
> define service{
>         host_name 42.42.42.42
>         service_description CPU:CPU_1
>         check_command
> check_unix_cpu!500!0!1000!0!.1.3.6.1.4.1.2021.10.1.3.1!public
>         max_check_attempts 4
>         normal_check_interval 5
>         retry_check_interval 5
>         active_checks_enabled 1
>         passive_checks_enabled 0
>         check_period 24x7
>         parallelize_check 1
>         check_freshness 0
>         flap_detection_enabled 0
>         process_perf_data 1
>         retain_status_information 1
>         retain_nonstatus_information 1
>         notification_interval 60
>         notification_period 24X7
>         notification_options w,c,r
>         notifications_enabled 0
>         stalking_options o,w,u,c
> }
> 
> My nagios.cfg is :
> 
<snip>

> inter_check_delay_method=s
> service_interleave_factor=s
> max_concurrent_checks=10000
> service_reaper_frequency=10
> sleep_time=1
<snip>

> 
> My perfdata function enter the check result in RRD and in a mysql
> database to generate statistics.
> 
> Nagios schedules the check, but the check are not executed at the
> scheduling time. For example a sheduled check at 9:42 is executed at
> 9:55... My average CPU load is not high (load average: 2.27, 1.41,
> 1.18).
> 
> My computer is a bi P3 1,26GHz
> 
> I have tried inter_check_delay_method=0.01 without best result. The
> schedule is different (more aggressive) but the check are late.
> 
> Any ideas ? Thanks a lot.
> 

You are using a "smart" check interleave factor. That allows to Nagios to 
schedule the time of the actual check within a time boundary.  It will not 
be the same interval every time, but close.

Look at the docs for check interleave factor if you want precise control.

-- 
-sg



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