CPU Competition Issue

[Chuck Burns]

On 10/29/2012 08:33 PM, Steven Nikkel wrote:
> I'm running a long duration CPU-centric process that will gobble up all
> available CPU time. I have it set to run at nice +20. While it's running
> I've noticed other processes have a hard time getting CPU time and run
> their activites very slowly. The processes I've noticed issues with are
> IO involved, but they don't appear to be IO blocked as they run
> dramatically faster and use much more CPU time when the CPU intensive
> process is not running. I haven't noticed issues with other processes,
> but I haven't been looking. If I push my CPU intensive process into idle
> priority 1, all the other processes return to their normal behaviour as
> if it's not running.
>
> This seems to be a specific behaviour on this one machine running
> 9.0-RELEASE-p4 on an Atom 330 dual core. I've tried with and without
> hyperthreading enabled with no noticeable change in behaviour.
>
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I will likely irritate some people, but you could try the 4BSD 
scheduler, see if that gives you better results.