[ovirt-devel] Chaning the statistics monitoring interval to 30s

[Arik Hadas]

On Wed, Jul 5, 2017 at 5:57 PM, Roy Golan <rgolan at redhat.com> wrote:

> Hi all,
>
> I would like to get feedback on $subject and see if I'm missing something.
> The impact of this is simply less resource consumption and by that we can
> support even greater number of hosts [1] and vms in the system.
>

> If you think more relaxed statistics collection will affect a core flow
> let me know - as far as I see I didn't spot anything critical.
>

> The overhead of a cycle per host something like that: 2 roundtrips per
> host in a cycle, (vm + host stats) and tons of memory allocation for char[]
> -> json-> maps of maps -> VM/Vds statistics -> Maps -> serialiazing to DB.
>
> To minimize the effect of this change we can leave a call to 'list' verb
> to at least detect vms existence in the same rate as today.
>

+1


>
> Pros
> - Engine has rore resources to support more hosts/vms/other activities of
> the engine
> - Vdsm will have more resources as well (need to tweak vdsm to collect in
> the same
> frequency)
> - less DB writes and reads, approx half of what the system will do in the
> in its lifefpan (cause this is what is mainly does all the time)
>
> Cons
> - DWH/Dashboard will have less entries, I'm not sure what is graphical
> affect given our hourly resolution (cmiiw here)
>

What's the frequency of the queries done by DWH/Dashboard? Do they count on
the _update_date column of the queried data?
I'm asking because if they query the database every minute and say "the
time now is 10:30 and the queried data is ..." then there should not be
less entries.


>
>
> [1] https://bugzilla.redhat.com/show_bug.cgi?id=1430876
>

>
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