[SR-Users] Free size of shared memory falls to near zero during the load testing

[Andrey Deykunov]

Daniel,

I've repeated the test with 1Gb of shared memory (-M 16 -m 1024). free_size
parameter fell to 2Kb during the test.

Olle,

I've gathered metrics about tm module:
- tm.build_cell: 490Mb at the on the peak;
- other metrics take about 2Kb - 6 Mb


Thanks,
Andrey


2018-01-12 5:13 GMT-05:00 Olle E. Johansson <oej at edvina.net>:

> Andrey,
> Can you please run “kamcmd tm.stats” and check the values. I have a
> similar problem and see clearly
> a lot of transactions not being freed, eating up memory and ending with
> out of memory messages in the log.
> Have an open issue about it in the bug tracker.
>
> /O
>
> On 12 Jan 2018, at 11:10, Daniel-Constantin Mierla <miconda at gmail.com>
> wrote:
>
> Hello,
>
> if you run with 512MB, is the shm free getting to 1.8MB as well for same
> figures of registrations and calls?
>
> Cheers,
> Daniel
>
> On 12.01.18 09:19, Andrey Deykunov wrote:
>
> Hi,
>
> We use kamailio as a router in our PBX server. The test below causes
> significant decreasing of free shared memory and
> many "out of memory" errors in kamailio log:
>
> Preconditions: kamailio server with 256Mb of shared memory allocated.
>
> Test actions: run two load testing scripts at the same time:
>   1) 10000 register operations;
>   2) 20000 calls (about 300 per sec);
>
> Results:
>     1) memory consumption in peak values:
>  - shmem.free_size: 1.8Mb
>  - core: 120Mb:
>  - build_req_buf_from_sip_req: 12.5Mb
>  - msg_lump_cloner: 23.6Mb
>  - sip_msg_shm_clone: 84Mb
>  - tm module: 118Mb
>     2) shmem.free_size parameter back to normal after the test, so it
> could be concluded that we don't have any memory leaks.
>
> Is it normal behavior or it's possible to do something to increase
> performance?
>
> PS: the same behaviour occurs for various values of shared memory defined
> at the start of kamailio server (128Mb, 256Mb, 512Mb etc.).
>
> Thank you,
> Andrey
>
>
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