[streaming] VLC Scalability

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Hello,

we are running an experiment to evaluate the scalability of the VLC in RTP 
mode.
For some reason we find that the server does not scale beyond 330 clients 
no
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 
suddenly
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 
and
found that DSS can do up to 400 clients (and even more) for small 
bitrates.
With regard to HD content, the DSS is also limited by the CPU on the 
server.

Many thanks for your advice,
 Philip

-- 
   Philip Frey 
   IBM Zurich Research Laboratory
   Saumerstrasse 4                                   |  Phone: +41 44 724 
8613
   CH-8803 Rueschlikon/Switzerland  |  Email: [email protected]
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<br><font size=2 face="sans-serif">Hello,</font>
<br>
<br><font size=2 face="sans-serif">we are running an experiment to evaluate
the scalability of the VLC in RTP mode.</font>
<br><font size=2 face="sans-serif">For some reason we find that the server
does not scale beyond 330 clients no</font>
<br><font size=2 face="sans-serif">matter what bitrate our movie is (we
are streaming Quicktime content).</font>
<br>
<br><font size=2 face="sans-serif">When streaming Full HD content (~9Mbps),
the number of clients is limited by the</font>
<br><font size=2 face="sans-serif">CPU power of the server. When using
Standard Definition content (~1Mbps and ~3Mbps), </font>
<br><font size=2 face="sans-serif">the CPU load increases up to about 330
connected client and then dropps suddenly</font>
<br><font size=2 face="sans-serif">to almost 0 and the clients no longer
receive any data.</font>
<br>
<br><font size=2 face="sans-serif">Do you have an explanation for this
behavior? Is there a hard limit on the number of</font>
<br><font size=2 face="sans-serif">clients that can connect to the VLC
server using RTP?</font>
<br>
<br><font size=2 face="sans-serif">We were running the same experiments
also on the Darwin Streaming Server and</font>
<br><font size=2 face="sans-serif">found that DSS can do up to 400 clients
(and even more) for small bitrates.</font>
<br><font size=2 face="sans-serif">With regard to HD content, the DSS is
also limited by the CPU on the server.</font>
<br>
<br><font size=2 face="sans-serif">Many thanks for your advice,</font>
<br><font size=2 face="sans-serif">&nbsp;Philip</font>
<br>
<br><font size=2 face="sans-serif">-- <br>
 &nbsp; Philip Frey &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; <br>
 &nbsp; IBM Zurich Research Laboratory<br>
 &nbsp; Saumerstrasse 4 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |
&nbsp;Phone: +41 44 724 8613<br>
 &nbsp; CH-8803 Rueschlikon/Switzerland &nbsp;| &nbsp;Email: [email protected]</font>
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