Icecast - Nov 2004 - CPU load

Hello all,

I want to stream multiple live programs. For that purpose the analog signal of
radio  program must be digitalized and encoded. I'm using RME HDSP 9652
(with 26 input channels) soundcard for capturing the sound. For encoding I'm
using jackified version of ices (ices-kh) and JACK server to connect multiple
ices processes to the soundcard. My operating system is  Linux Mandrake 10.0
with kernel 2.6. The drivers for soundcard is ALSA 1.0.6. My Hardware is 
Pentium4 HT 2,8 GHz with 512 MB of RAM. Operating system recognizes two logical
CPUs and distributes the load between these devices. When I start icecast, jackd
and 12 ices processes in this PC, I can see that these processes use about 80%
of the CPU time. My question is: is such a usage of CPU normal or not? What
parameters of ices configuration file can be changed to optimize consumption of
CPU time? I know, that a managed bitrate requires more CPU time , so I'm not
using this feature. Thank you in advance.
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On Tue, 2004-11-30 at 14:05, Mindaugas Musnikas wrote:
> Hello all,
>  
> I want to stream multiple live programs. For that purpose the analog
> signal of radio  program must be digitalized and encoded. I'm using
> RME HDSP 9652 (with 26 input channels) soundcard for capturing the
> sound. For encoding I'm using jackified version of ices (ices-kh) and
> JACK server to connect multiple ices processes to the soundcard. My
> operating system is  Linux Mandrake 10.0 with kernel 2.6. The drivers
> for soundcard is ALSA 1.0.6. My Hardware is  Pentium4 HT 2,8 GHz with
> 512 MB of RAM. Operating system recognizes two logical CPUs and
> distributes the load between these devices. When I start icecast,
> jackd and 12 ices processes in this PC, I can see that these processes
> use about 80% of the CPU time. My question is: is such a usage of CPU
> normal or not? What parameters of ices configuration file can be
> changed to optimize consumption of CPU time? I know, that a managed
> bitrate requires more CPU time , so I'm not using this feature. Thank
> you in advance.
The encoding operation is the far most extensive use of the CPU, so if
the encoder settings are what you want then there isn't much else.
ices-kh does allow for say the same encoded stream to be sent to be
multiple servers/mountpoints but whether that will be useful will depend
on the setup you have

karl.