Re: 1.2.45 Linux Scheduler

["Davide Libenzi" <davidel@xmail.virusscreen.com>]

----- Original Message -----
From: Jesse Pollard <pollard@tomcat.admin.navo.hpc.mil>
To: <anonymos@micron.net>; <linux-kernel@vger.kernel.org>
Sent: Wednesday, November 01, 2000 2:27 PM
Subject: Re: 1.2.45 Linux Scheduler


> ---------  Received message begins Here  ---------
>
> >
> > In the Linux scheduler they use a circular queue implementation with
round
> > robin. What is the advantage of this over just using a normal queue with
a
> > back and front. Also does anyone know what a test plan for such a design
> > would even begin to look like. This is a project for a proposal going
around
> > in my neighborhood and I am wondering why in the world someone would
want to
> > modify the Linux scheduler to this extent.
>
> This is not an authoritive answer but:
>
> It's simple, and fast. Locks only needed when adding/removing
> entries.
>
> It is also nearly optimum when the queue only has 5 (or so) number of
> entries. It will not be optimum if there are 32/64 CPUs with 120 or more
> runnable entries. There are other schedulers available that may do a
> better job for that situation.

I don't know who runs Linux w/ 32/64 CPUs and w/ 120 active procs but
if someone on earth exist ... :

http://www.mycio.com/davidel/lk/adapt-sched-v3.0-2.2.14.gz



- Davide


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