[Icecast] SMP support

Karl Heyes karl at xiph.org
Fri Apr 20 01:03:47 UTC 2007

Clement Cavadore wrote:

> The servers works great, but when I have a look on the CPU usage:
> top - 01:29:13 up  9:35,  2 users,  load average: 0.86, 0.77, 0.73
> Tasks:  61 total,   1 running,  60 sleeping,   0 stopped,   0 zombie
> Cpu0 : 0.0%us,  0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi,  0.0%si, 0.0%st
> Cpu1 : 4.0%us, 20.3%sy, 0.0%ni, 16.7%id, 0.0%wa, 2.0%hi, 57.0%si, 0.0%st
> ... as you can see, there is only one CPU which is used, although I can
> see 8 thread in /proc/$pid/task/
> Is there any reason for this (maybe an unique IP for the 3.5k listeners,
> or an unique mountmoint ?), or did I miss something on the config ?
> The server's kernel is the latest 2.6, and SMP-enabled.

What you'll be seeing is CPU1 running a source thread for the one stream 
you have. The other non-source threads icecast has tend to be fairly 
lightweight depending on what is exactly happening.   If you run a 
second stream (from source client or just a relay of your existing 
stream) under a different mountpoint then you should see the load 
distributed more.


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