CPU Competition Issue

[Andriy Gapon]

on 30/10/2012 03:33 Steven Nikkel said the following:
> 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.

Can you try with lower nice value, like +10?
You want a fix from r228718.  AFAIR, it is not in 9.0.

-- 
Andriy Gapon