[Hawkular-dev] Memory-usage of Hawkular-services

[Heiko W.Rupp]

Update with h2

I only ran this for ~20h and with only 30 feeds but memory
usage was lower than with hsqldb as the h2 cache
was some 20MB smaller than with hsqldb.

This was stable during until I added at around 12h from
the start some more feeds in parallel. This needs
thus more investigation.

   Heiko

On 23 Oct 2016, at 9:38, Heiko W.Rupp wrote:

> Update
>
> [ tl;dr: good news ]
>
> Lukas provided me with "connection properties" for hsqldb
> that limit the memory usage and this seems stable. I have been
> running h-services since Friday afternoon (~40h) with 33 HawkFly
> feeds.
>
> Two heap dumps taken yesterday afternoon and this morning
> both show a stable heap size of 192M, so I think we are on the
> safe side here (with hsqldb, see also below).
>
> On top of just ingesting metrics, I have created poor mans Chaos
> Monkey that randomly stops and restarts a container every 5 minutes
> (parallel on 2 machines where my feeds live) to also stress the 
> initial
> sync when a feeds is (re) connecting.
> I also had a (very small) number of alert triggers defined, that
> were firing when heap on a hawkfly is > 60k, which happened quite
> often.
> This was running during the last 36h, so is included in above
> heap metrics.
>
> The MBeans for hawkular metrics show an insertion rate of around
> 33 metrics/s , so a HawkFly corresponds to 1metric/s.
>
> About hsqldb: I am going to shut this down now and test with a
> h2-based instance, as h2 is already in WildFly and EAP and
> should be used instead of hsqldb.
>
> Some time next week I will also try to instrument HawkFly in a away
> that it automatically defines some alert triggers on startup.
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