But I would like a kernel to let boinc (the "nice=19" processes) fill
the idle time as much as possible. The current kernel scheduler seems
very sensitive to low-nice (higher priority) processes.
How can I change this sensitivity? I'm looking at kernel/sched.c,
but it's more complicated than a few years ago when I hacked this
before :) and that I'm using HT (SMP).. Will you tell me any hint
where to modify, and/or what to take care of? or any pointer to
proper resources on the Internet?
When I use gnome desktop with a system monitor applet, I see there's
always some idle part and top also shows the idle time on gnome even
if I don't run any specific applications besides system daemons and
gnome background processes. However without gnome/X window, top shows
no or very small idle power (as a matter of course.) So I want the
kernel to be less sensitive. Maybe it will utilize more cpu power.
best regards,
On 5/19/05, Con Kolivas <[email protected]> wrote:
> On Thu, 19 May 2005 04:58 pm, Tetsuji "Maverick" Rai wrote:
> > On 5/19/05, Con Kolivas <[email protected]> wrote:
> > > ------------snip---------------
> > > Hyperthread sibling cpus share cpu power. If you let a nice 19 task run
> > > full power on the sibling cpu of a nice 0 task it will drain performance
> > > from the nice 0 task and make it run approximately 40% slower. The only
> > > way around this is to temporarily make the sibling run idle so that a
> > > nice 0 task gets the appropriate proportion of cpu resources compared to
> > > a nice 19 task. It is intentional and quite unique to the linux cpu
> > > scheduler as far as I can tell. On any other scheduler or OS a nice 19
> > > "background" task will make your machine run much slower.
> > >
> > Thanks. I understood it's a feature of linux kernel and am satisfied
> > with it. Actually on Windows xp my application sometimes slows down
> > maybe due to inpropoer scheduler.
>
> Well I invented it so it's very unlikely that Windows* will have it (?yet) :D
>
> Cheers,
> Con
>
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