On Tue, 30 Oct 2012, Andriy Gapon 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.
Can you try with lower nice value, like +10?
You want a fix from r228718. AFAIR, it is not in 9.0.
They seem to share in a much more reasonable manor after assigning the
process to +10 instead of +20, which sounds like the fix you mentioned.
The process hits priorities in the 120s when its competing. I think I'll
continue with idle priority as that obtains the sharing behaviour I'm
after.
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