On 11/18/10 10:55 AM, Lucius Windschuh wrote:
2010/11/18 Andriy Gapon<a...@freebsd.org>:
[Grouping of processes into TTY groups]
Well, I think that those improvements apply only to a very specific usage
pattern
and are greatly over-hyped.
But there are serious issue if you use FreeBSD as a desktop OS with
SMP and SCHED_ULE, or?
Because currently, my machine is barely usable if a compile job with
parallelism is running. Movies stutter, Firefox hangs. And even nice
-n 20 doesn't do the job in every case, as +20 seems not to be the
idle priority anymore?!?
And using "idprio 1 $cmd" as a workaround is, well, a kludge.
I am not sure if TTY grouping is the right solution, if you look at
potentially CPU-intensive GUI applications that all run on the same
TTY (or no TTY at all? Same problem).
Maybe, we could simply enhance the algorithm that decides if a task is
interactive? That would also improve the described situation.
tty grouping is a variant of what we used to have at one stage which is
a "kernel schedulable entity group".. KSEG
the idea is that all items in a group share some characteristic and
some amount
of resources.
We stripped the KSEG out of the picture because it really complicated
the picture.
Regards,
Lucius
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