lkml.org 
[lkml]   [2001]   [Jan]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: multi-queue scheduler update
On Fri, Jan 19, 2001 at 02:35:02AM +0100, Andrea Arcangeli wrote:
> On Thu, Jan 18, 2001 at 08:00:16PM -0500, Mark Hahn wrote:
> > > > microseconds/yield
> > > > # threads 2.2.16-22 2.4 2.4-multi-queue
> > > > ------------ --------- -------- ---------------
> > > > 16 18.740 4.603 1.455
> > >
> > > I remeber the O(1) scheduler from Davide Libenzi was beating the mainline O(N)
> >
> > isn't the normal case (as in "The Right Case to optimize")
> > where there are close to zero runnable tasks? what realistic/sane
> > scenarios have very large numbers of spinning threads? all server
> > situations I can think of do not. not volanomark -loopback, surely!
>
> This is why the numbers with 2/4/8 threads in the runqueue are the most
> interesting ones 8)

With Arjan's patch to use prefetching for the runqueue scan the numbers
will be likely different [at least on cpus that can benefit from prefetching
like p2+ or athlon]

-Andi
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:28    [W:0.188 / U:2.736 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site