Re: Strange display of CPU usage

[Martin Pala]

Hello Marcus,

the problem is caused when the cpu usage monitoring is initializing - it needs 
two monitoring cycles to get the the difference, whereas the first cycle is 
internally set to -1 and it is set to real value on next cycle.

* Fixed display of cpu user/system/wait usage which temporarily displayed -1.0%
  between two monitoring cycles while cpu monitoring was initializing. Thanks to
  Marcus Muelbuesch for report.

Regards,
Martin


On Sep 14, 2010, at 2:16 PM, Marcus Mülbüsch, AS-Infodienste GmbH 
(Systemadministration) wrote:

>   I have it seen sometimes, shortly after I start monit and issue a 'monit 
> summary' that the CPU usage lists negative values:
> 
> 
>> System 'name.tld'
>>  status                            running
>>  monitoring status                 monitored
>>  load average                      [0.00] [0.11] [0.15]
>>  cpu                               -1.0%us -1.0%sy -1.0%wa
>>  memory usage                      603584 kB [15.2%]
>>  data collected                    Tue Sep 14 14:00:41 2010
> 
>   This is not exactly serious, as it disappears after the first minute; but 
> can it be true? Do I miss something of how CPU resources are really measured?
> 
>   Using "This is monit version 5.1.1" on "2.6.22-vs2.2.0.7-gentoo" inside a 
> VServer guests (but it happens on the VServer host, too.)
> 
> Marcus
> 
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