[Freeswitch-users] mod_conference scalability

Michael Jerris mike at jerris.com
Thu Dec 17 07:18:25 PST 2009

I would be curious what the same tests produce with svn trunk of FreeSWITCH.


On Dec 16, 2009, at 4:49 PM, Brian wrote:

> Hi,
> I’m new to FreeSWITCH and I’m testing the scalability of mod_conference to see if it will scale better that other solutions. My scenario is to have one speaker, and many listeners (mute). Since I have only one speaker, I was expecting this to scale well because there is no audio mixing required, just send each frame of the single speaker to each listener. Unfortunately, my testing was disappointing, and it didn’t scale nearly as well as I’d hoped (based on what I’ve read on how FreeSWITCH is supposed to be generally very scalable).
> Here’s my server setup is this:
> FreeSWITCH 1.0.4, 64 bit CentOS 5.3, on a quad-core Xeon server, 4 Gig of RAM. I’ve set file logging to “notice” level. My conference profile is configured to suppress several events, hoping that it would improve performance.
> Here are a few scenarios I tested, and roughly where I reached the point of audio failure on the conferences:
> Scenario 1:
> 1 conference, 1 speaker, audio failed at approx 300 listeners (mute)
> Scenario 2:
> 4 conferences, 1 speaker per conference, audio failed approx 110 listeners per conference (so just over 400 total channels on the system).
> Scenario 3:
> 16 conferences, 1 speaker per conference, audio failed at 32 listeners per conference (so just over 500 total channels on the system).
> Looking at the output from “top”, it seems that in all 3 scenarios, the audio quality failed when the % CPU for the FreeSWITCH process exceeded 300%.
> I was hoping maybe someone else might have done similar testing, or maybe has suggestions on how to improve the performance. Or perhaps an alternate solution to the one speaker, many listener case?
> Thanks,
> Brian.
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