[Freeswitch-users] mod_conference scalability

Brian brian at proximosystems.com
Thu Dec 17 11:29:14 PST 2009

Hi Mike,


I didn't get around to testing on the FreeSWITCH trunk yet. Are there
substantial fixes to mod_conference in the FreeSWITCH trunk that might
increase capacity for my scenario of one speaker and many listeners? If I
want to put this into a production environment, I would need a stable
version, which as far as I know is the 1.0.4 version.


However, I did test on Asterisk 1.4 using app_conference, and doing the same
scenario was able to get 1 speaker and 600 listeners on a single conference
with no audio issues. The CPU at that point was just over 300%, same as
where the single conference scenario failed on FreeSWITCH with 300
listeners.  I was able to push it to over 700 listeners before I reached
400% CPU usage (I guess maxing out my quad-core processors), and asterisk
finally crashed. But up until that point, there were no audio problems. 


I've read a lot about how FreeSWITCH is supposed to be more scalable than
Asterisk, but unless there is something wrong with my FreeSWITCH setup,
Asterisk was clearly the winner in this test - more than doubling FreeSWITCH
capacity in this case. Again, maybe there is something on the FreeSWITCH
side that I'm doing wrong, but I don't see what it could be.





From: Michael Jerris [mailto:mike at jerris.com] 
Sent: Thursday, December 17, 2009 10:18 AM
To: freeswitch-users at lists.freeswitch.org
Subject: Re: [Freeswitch-users] mod_conference scalability


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




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



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


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


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


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?






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