Re: [Xenomai-help] bring down the system

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

Stefan Schaal wrote:
> Sorry, I attached the wrong C-program in the previous posting ....  
> here is the corrected version:
> 
> Hi,
> 
>   attached is a little C program that spawns off a task which runs a  
> heavy tiny math job. Despite my 8 processor machine, taking this one  
> task to 99% CPU load slows down the entire computer, often such that  
> there is no return except for a forced restart.
> 
> I run the xenomai-head git, updated on Oct. 29 the last time, on a  
> i386 ubuntu system with kernel 2.6.29.5.
> 
> Does anybody know what is going wrong here, i.e., am I not permitted  
> to take my CPUs to the max load?

No, you can not do that. When a Xenomai task runs, Linux does not, and
for your system to work correctly, Linux should run from time to time,
so, the typical Xenomai setup is a periodic task which wakes up, does
some job, and goes back to sleep, leaving some time for linux to run.

-- 
                                          Gilles