Hi
Thanks for your time and help. I’ve made some changes to my configuration
(which we are able to provision with Ansible) and am experimenting with the
results:
if loadavg (1min) > {{ ansible_processor_count * 2 }} for 4 cycles then
alert
if loadavg (5min) > {{ ansible_processor_count * 1.5 }} for 4 cycles then
alert
if loadavg (15min) > {{ ansible_processor_count }} for 4 cycles then alert
(processor_count seems to be what we need here as we are using vCPUs)
Kind regards,
*Jamie*
*From:* monit-general [mailto:monit-general-bounces+jamie=ib3...@nongnu.org]
*On Behalf Of *mart...@tildeslash.com
*Sent:* 08 April 2019 21:54
*To:* This is the general mailing list for monit <monit-general@nongnu.org>
*Subject:* Re: loadavg figures - percentages or not?
Hi,
the loadavg is not percent - as the manual states, it is absolute value:
number of processes in the run queue. The practical limit depends on the
number of CPUs and the typical load pattern - a rule of thumb we use is 2
processes per CPU core. If the machine has for example 48 cores, the
loadavg of 96 is usually acceptable. There could be also spikes which are
common and you may want to suppress false alerts, the example shows setup
where high loadavg values for several consecutive cycles are needed before
the alert is triggered.
To make the configuration easier, i think we can introduce some kind of
"per CPU core" load average test, so the configuration will work the same
regardless of CPU cores count, something like:
if loadavg(1m) per core > 1.9 then alert
Best regards,
Martin
On 8 Apr 2019, at 15:38, Jamie Burchell <ja...@ib3.uk> wrote:
Hi there
On the Monit documentation on “System resource tests” (
https://mmonit.com/monit/documentation/monit.html#System-resource-tests)
the “loadavg” figures look like they could be percentages rather than
absolute values. Is that correct, or am I misreading?
Most of the examples I’ve seen elsewhere for using the “loadavg” checks
appear to be using single figures (
https://mmonit.com/wiki/Monit/ConfigurationExamples - System Services).
If I’ve misunderstood then I’ll probably want to calculate these values
based on the number of processors – but not necessary if these are
percentages?
TIA
Jamie
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