[SR-Users] Meaning of shmem stats and question on dmq dialog sharing behaviour

[George Diamantopoulos]

Nope, it opens fine here. Does this work: https://snipboard.io/5E4V3m.jpg ?

On Tue, 2 Jun 2020 at 08:34, Daniel-Constantin Mierla <miconda at gmail.com>
wrote:

> Hello,
>
> I get image not found on that link, have you removed it?
>
> Cheers,
> Daniel
> On 01.06.20 13:57, George Diamantopoulos wrote:
>
> Hello all,
>
> I've recently been experimenting with dmq, and I've noticed something that
> seemed a little odd. shmem use would often be abnormally high on otherwise
> idle kamailio nodes (literally, only dispatcher module OPTIONS were
> exchanged at the time besides KDMQ messages).
>
> After disabling the "enable_dmq" parameter for the dialog module, this
> sort of absurd behaviour ceased. To get a quantified idea of this change's
> effect, check out the following screenshot from our monitoring system:
> https://pasteboard.co/Jb430lD.png
>
> As you can see, the spikes stopped manifesting at around 05:00, when dmq
> was disabled for dialog (albeit still employed for htable). shmem use then
> grew as traffic was introduced to these nodes, and htables began filling
> with data.
>
> I was wondering if this to be expected, which I find highly odd given that
> at the time other productive systems in the DMQ cluster were also idle
> (given the time of the day), not to mention that their shmem usage was not
> nearly as high.
>
> Could this be attributed to some configuration error, with updates looping
> endlessly (or until some counter reaches zero or something) among nodes? Or
> could memory be used for other housekeeping purposes unrelated to dmq
> dialog sharing?
>
> Lastly, what is the meaning (and differences) of these shmem stats?
>
>    - real_used_size
>    - used_size
>    - max_used_size
>
> Max used size I get (I'm guessing maximum seen since server was started?)
> but what's the difference between real_used and used? Thanks!
>
> Best regards,
> George
>
>
> _______________________________________________
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>
> --
> Daniel-Constantin Mierla -- www.asipto.comwww.twitter.com/miconda -- www.linkedin.com/in/miconda
> Funding: https://www.paypal.me/dcmierla
>
>
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