Re: CPU usage in Monit

[Lawrence, Wayne]

Hi Igor,

 

the operating system is RHEL6 and monit version is 5.3.1

 

this is what i have in my config

 

    if cpu usage (user) > 70% then alert
    if cpu usage (system) > 30% then alert
    if cpu usage (wait) > 20% then alert

this is one of the errors

Description: cpu system usage of 50.0% matches resource limit [cpu system usage>30.0%]

 

this is what i get in /var/log/messages

Dec  6 12:01:29 <hostname-removed> monit[864]: <hostname-removed> cpu system usage of 50.0% matches resource limit [cpu system usage>30.0%]

Dec  6 12:02:29 <hostname-removed> monit[864]: <hostname-removed><hostname-removed>' cpu system usage check succeeded [current cpu system usage=0.9%]

 

this is the output of ps --no-headers -A -o "%cpu sz ucomm" | sort -k1nr | head -20

 

 12:01:29 up 4 days, 20:24,  2 users,  load average: 0.04, 0.01, 0.00
             total       used       free     shared    buffers     cached
Mem:       2055108    1092176     962932          0      53156     811864
-/+ buffers/cache:     227156    1827952
Swap:      4128760          0    4128760
 1.2 44308 perl
 0.0     0 aio/0
 0.0     0 async/mgr
 0.0     0 ata/0
 0.0     0 ata_aux
 0.0     0 bdi-default
 0.0     0 cpuset
 0.0     0 crypto/0
 0.0     0 events/0
 0.0     0 ext4-dio-unwrit
 0.0     0 flush-253:0
 0.0     0 jbd2/dm-0-8
 0.0     0 kacpi_hotplug
 0.0     0 kacpi_notify
 0.0     0 kacpid
 0.0     0 kauditd
 0.0     0 kblockd/0
 0.0     0 kdmflush
 0.0     0 khelper
 0.0     0 khubd

Have to say i am at a total loss as there is no way the usage figures are accurate.

If there is any other info i can supply that will be useful please let me know.

 

Regards

 

Wayne

On 6 December 2011 12:03, Igor Homyakov <address@hidden> wrote:

Hi Lawrence,

Could you be a little bit more specific ?  Please provide information
about you operation system, monit version on which the problem
occurred and so on.

Regards
Igor Homyakov

On Tue, Dec 6, 2011 at 15:35, Lawrence, Wayne
<address@hidden> wrote:
> Hi,
>
> I have a few CPU usage checks in my monitrc but it seems monit is
> misreporting the usage.
>
> I have run several tests and it seems that monit is multiplying the actual
> usage by 10.
>
> I ran a process with top running in another shell and CPU usage for the user
> was never above 10% yet monit informed me that there was 100% cpu usage.
>
> I have tried various configurations including the one that came with the
> default config for system cpu monitoring and all seem to demonstrate the
> same issue.
>
> Any advice welcomed on this
>
> Regards
>
> Wayne Lawrence
>
>
>

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