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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