[Serusers] Usrloc performance

[Teemu Harju]

Hi!

I posted about this same subject to openser mailing list already, but since
I haven't had response from there I'll try here. I guess the usrloc module
and the core functionality is quite the same with ser and openser.

I've been running some performance tests on my OpenSER box and while
registering large number of users I faced some very strange problems. At
least they seem strange to me, but I hope someone on this list would be able
to shed some light on this.

So, I use Openser 1.0.1 and I load test it using SIPp. I've done tests
creating about 1000 registrations per second registering 300k-450k different
users. Register rate is constat and for each register different user is
used. What is strange to me that just about when 300k users have registered
the CPU of the PC running the proxy hits 100% usage and messages start
dropping. I made a nice image to illustrate my problem using Excel. Check it
at http://www.teemuharju.net/wp-images/register_300k_users_at_1000rps.png.

On this test I registered 300k different users at 1000 RPS and after
registering those users the registering starts again from the beginning. As
you can see from it the CPU usage rises constantly and drops immediately
after I've registered 300k users and the registering starts again from the
start. So then each user is being registered all over again, but still the
CPU load grows. Does anyone have explanation for this? Why does the CPU
usage grow based on the number of users registered? And why does it drop for
a while when registering starts all over again? I've tried different usrloc
modes, but there seems to be no difference. This one was done with having
usrloc only in the memory. Shouldn't the CPU usage at constant register
rate, be somewhat constant also? Has anyone else noticed the same problem?
Could this be somehow explained or do I have something wrong with my system?

Regards,

Teemu

--
Teemu Harju
http://www.teemuharju.net
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