Re: Monitoring load average relative to number of CPUs

[Daniel Levine]

Thanks, Callum and Martin. We're not using Puppet but we can do something similar.

On Thu, Apr 10, 2014 at 2:26 PM, Callum Macdonald <address@hidden> wrote:

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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