Re: Monitoring load average relative to number of CPUs

[Callum Macdonald]

We get around this issue by generating our configs dynamically from 
puppet. Here's the ERB excerpt:

        if loadavg (1min)  > <%= scope.lookupvar('processorcount').to_i 
* 2 %> for 5 cycles then alert
        if loadavg (5min)  > <%= scope.lookupvar('processorcount').to_i 
* 1.5 %> for 5 cycles then alert
        if loadavg (15min) > <%= scope.lookupvar('processorcount').to_i 
%> for 5 cycles then alert

Cheers - Callum.

On 10/04/2014 20:16, Martin Pala wrote:
> Hi Daniel,
>
> the load average value is currently absolute only. The rule of thumb usually 
> was that load average of 2 per CPU core is acceptable, which translates to 2 
> runnable processes per CPU. Relative load average settings may be useful - load 
> of 1 per each CPU would correspond to 100%, i.e. on 16 cores system load 16 = 
> 100%, to test for load corresponding to 32 on such system the value will be 
> 200%. The percentage would work regardless of CPU count (for example in the 
> case of single CPU the load 100% will correspond to load average 1).
>
> We can maybe add such option in the future.
>
> Regards,
> Martin
>
>
> On 10 Apr 2014, at 18:50, Daniel Levine <address@hidden> wrote:
>
> > Hi all,
> >
> > Is it possible to have monit alert when load average exceeds the number of 
> > CPUs, i.e. without having to set a specific number? This would be convenient 
> > for virtual machines. The documentation seems a little vague on the subject 
> > though.
> >
> > I did try setting load average as a percentage, but that resulted in a syntax 
> > error.
> >
> > Thanks in advance!
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Callum Macdonald

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