[vlc-devel] VLC Scalability

Philip Frey1 PHF at zurich.ibm.com
Thu Feb 5 11:03:12 CET 2009


we are running an experiment to evaluate the scalability of the VLC in RTP 
For some reason we find that the server does not scale beyond 330 clients 
matter what bitrate our movie is (we are streaming Quicktime content).

When streaming Full HD content (~9Mbps), the number of clients is limited 
by the
CPU power of the server. When using Standard Definition content (~1Mbps 
and ~3Mbps), 
the CPU load increases up to about 330 connected client and then dropps 
to almost 0 and the clients no longer receive any data.

Do you have an explanation for this behavior? Is there a hard limit on the 
number of
clients that can connect to the VLC server using RTP?

We were running the same experiments also on the Darwin Streaming Server 
found that DSS can do up to 400 clients (and even more) for small 
With regard to HD content, the DSS is also limited by the CPU on the 

Many thanks for your advice,

   Philip Frey 
   IBM Zurich Research Laboratory
   Saumerstrasse 4                                   |  Phone: +41 44 724 
   CH-8803 Rueschlikon/Switzerland  |  Email: phf at zurich.ibm.com
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