[pjsip] Conferfence Bridge Benchmarking

Thomas Plotkowiak plotti at gmx.net
Wed May 28 09:12:11 EDT 2008


I will give confbridge a try, should be a good start to gather some data.
I see there is already resampling possibility in confbench.c, how would I
add some audiocodecs encoding / decoding to that to get a more realistic
example?

Cheers,
Thomas, who is really interested what the outcome of such a test will be ;)


2008/5/28, Benny Prijono <bennylp at pjsip.org>:
>
> On Wed, May 28, 2008 at 11:19 AM, Thomas Plotkowiak <plotti at gmx.net>
> wrote:
> > Since it is almost impossible to find any data on the internet about the
> > scaling of conference bridges I would like to do a test myself with
> pjsip.
> >
>
> We have confbench.c in samples directory, does it not do what you want?
>
> > When i talk about scaling i mean the CPU usage for mixing audiosignals.
> > A chart like Usage of CPU vs. Number of mixed Audiosignals would be
> perfect.
> > Another option could be CPU vs. Number of decoded Audiosignals (or
> encoded)
> >
> > My Problem is: In terms of bandwith a 100Mbit Server would theoretically
> > capable of recieving around 6000 16 kbit Streams before he runs out of
> > Bandwidth, but i think that it rather runs out of CPU instead with
> already
> > 500 Streams to be mixed in the conference bridge. I cant prove my point
> > untill I have some data.
> >
>
> We can do that too of course (by using pjsua, or maybe building
> another application to do that), but the problem with that is you're
> benchmarking the whole system (codec, jitter buffer, socket, and maybe
> even resampling, WSOLA, PLC, and AEC etc.) rather than the bridge
> alone, which may or may not be what you want. For benchmarking the
> conference alone the confbench.c sample is the perfect start IMO.
>
> Cheers
> Benny
>
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