[sr-dev] Large memory allocation on module startup

[kthulasizwe at gmail.com]

Thanks for the reply,
So previously under load testing, I could do around 240 registrations per seconds and now it’s only around 180.

Also, forgot to mention, it would perform better (around 228 reps) when the load testing was delayed for 10 to 20 minutes after restarting.


> On 12 Aug 2022, at 12:53, Henning Westerholt <hw at gilawa.com> wrote:
> 
> Hello,
> 
> can you add a bit more details, e.g. before it took x seconds and now it takes y seconds? 
> 
> Some modules (e.g. carrierroute) can allocate quite large shared memory segments during startup, and it should work ok.
> 
> Cheers,
> 
> Henning
> 
> -- 
> Henning Westerholt - https://skalatan.de/blog/
> Kamailio services - https://gilawa.com
> 
> -----Original Message-----
> From: sr-dev <sr-dev-bounces at lists.kamailio.org> On Behalf Of kthulasizwe at gmail.com
> Sent: Friday, August 12, 2022 11:04 AM
> To: sr-dev at lists.kamailio.org
> Subject: [sr-dev] Large memory allocation on module startup
> 
> Hi Guys,
> 
> I have recently modified a custom module, where I now shm_mallocxz 2MB, as part of module start up and this memory is not being used as yet.
> 
> Previously, the would be smaller chunks(100 bytes at most) shm_malloced during message processing. 
> I have observed significant runtime performance degradation from just this single change. I would appreciate any suggestions/thoughts you might have.
> 
> Below are some the relevant details.
> 
> OS:Alpine Linux
> RAM: 16GB
> Configured Shared memory: 4GB
> shm_force_alloc=1
> Typical shared memory usage: 1.5GB
> System swapping is disabled, also observed during load testing that no mem is getting swapped.
> 
> 
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