[vlc] ["Lopez, A." <a.lopez at tue.nl>] RE: Re: VLC number of simultaneous streams

[System administration]

The deleted attachments are at:
    <http://www.videolan.org/~admin/20051115-videolan/cpu.PNG>
    <http://www.videolan.org/~admin/20051115-videolan/traffic.PNG>
    <http://www.videolan.org/~admin/20051115-videolan/swap.PNG>

----- Forwarded message from "Lopez, A." <a.lopez at tue.nl> -----

From: "Lopez, A." <a.lopez at tue.nl>
Date: Tue, 15 Nov 2005 14:33:29 +0100
To: vlc at videolan.org
Subject: RE: [vlc] Re: VLC number of simultaneous streams
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> > I have managed to (UDP) stream up to 20 videos simultaneously
without
> > problems.
> Probably worth looking at your disk subsystem. What bitrate are the
> movies?
> High quality broadcast streams, say 4Mbps require 0.5MBytes per
second.
> Even
> on high end machines, unless special measures are taken, standard OS
disk
> reading will not work well at high stream counts.

Indeed the movies are at 4Mbps. 
Some time ago I installed MRTG to check the performance of the servers.
I have attached the graphs that were generated during those tests. The
first graphs shows the traffic coming out of the server (during the test
where the server streamed 20 streams, which corresponds to the second
pick, it reaches a maximum value of about 12 Mbytes/sec).
The second graph shows CPU usage (reaches a maximum value of 38%).
The third graphs shows swap memory usage and you can see that, when the
vlc starts having problems (trying to stream more than 20 videos), the
swap space is massively used (more than 1.5 GB). On the other hand, when
streaming e.g. 15 videos, the swap space is not used at all.

The server is a P4-2.8GHz, 512RAM, 80GB HDD.

Do you have any explanation for this behaviour?

Kind regards,
Alex

PS. How can I check the disk subsystem?


----- End forwarded message -----

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