From: John Bradford <john@grabjohn.com>
To: felipe_alfaro@linuxmail.org, helgehaf@aitel.hist.no
Cc: linux-kernel@vger.kernel.org
Subject: Re: O(1) scheduler & interactivity improvements
Date: Mon, 23 Jun 2003 11:50:08 +0100 [thread overview]
Message-ID: <200306231050.h5NAo8EE000843@81-2-122-30.bradfords.org.uk> (raw)
> Maybe I have different a different idea of what "interactive" should be.
[snip]
> moving windows around the screen do feel jerky and laggy at best
> when the machine is loaded. For a normal desktop usage, I prefer all
> my intensive tasks to start releasing more CPU cycles so moving a
> window around the desktop feels completely smooth
That's fine for a desktop box, but I wouldn't really want a heavily
loaded server to have database queries starved just because somebody
is scrolling through a log file, or moving windows about doing admin
work.
The wordprocessor example is an interesting one - if the user is
changing fonts, re-flowing text and generally using it like a DTP
application, then I'd agree that it needs to have a more CPU.
If I was simply typing a letter, I wouldn't really care about
interactivity. If I was using a heavily loaded server to do it,
(unlikely), I'd rather the wordprocessor was starved, and updated the
screen once per second, and gave more time to the server processes,
because I don't need the visual feedback to carry on typing. Screen
updates are a waste of CPU in that instance - it might look nice, but
all it's doing is starving the CPU even more.
I propose a radically different approach to scheduling, why not
favour processes that cause the fewest cache faults? I.E. if a
process that gets more done in it's timeslice is more deserving of
it. It might look ugly with screen updates being starved, but it
would probably get more work done :-).
John.
next reply other threads:[~2003-06-23 10:27 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-23 10:50 John Bradford [this message]
2003-06-23 11:22 ` O(1) scheduler & interactivity improvements Felipe Alfaro Solana
2003-06-23 11:36 ` Denis Vlasenko
-- strict thread matches above, loose matches on Subject: below --
2003-06-23 23:32 John Bradford
2003-06-24 4:13 ` Bill Davidsen
2003-06-23 19:20 John Bradford
2003-06-23 12:44 John Bradford
2003-06-23 16:32 ` Helge Hafting
2003-06-23 19:00 ` Felipe Alfaro Solana
2003-06-23 19:17 ` Helge Hafting
2003-06-24 22:41 ` Timothy Miller
2003-06-25 21:42 ` Helge Hafting
2003-06-25 23:16 ` Timothy Miller
2003-06-23 21:48 ` Bill Davidsen
2003-06-22 16:07 Felipe Alfaro Solana
2003-06-22 20:00 ` Davide Libenzi
2003-06-23 12:50 ` Jesse Pollard
2003-06-23 8:09 ` Helge Hafting
2003-06-23 10:18 ` Felipe Alfaro Solana
2003-06-23 16:21 ` Daniel Gryniewicz
2003-06-23 18:59 ` Felipe Alfaro Solana
2003-06-23 16:47 ` Helge Hafting
2003-06-24 18:12 ` Bill Davidsen
2003-06-25 21:41 ` Helge Hafting
[not found] ` <5.2.0.9.2.20030624215008.00ce73b8@pop.gmx.net>
2003-06-26 9:59 ` Helge Hafting
2003-06-26 10:39 ` Mike Galbraith
2003-06-26 14:50 ` Bill Davidsen
2003-06-26 23:10 ` Timothy Miller
[not found] ` <Pine.LNX.3.96.1030626104733.17562D-100000@gatekeeper.tmr.c om>
2003-06-27 6:36 ` Mike Galbraith
2003-06-27 8:18 ` Helge Hafting
2003-06-27 9:46 ` Mike Galbraith
2003-06-27 11:39 ` Helge Hafting
2003-06-27 12:18 ` Mike Galbraith
2003-06-28 3:51 ` Bill Davidsen
[not found] ` <Pine.LNX.3.96.1030627234408.25848A-100000@gatekeeper.tmr.c om>
2003-06-28 5:44 ` Mike Galbraith
2003-06-28 14:34 ` Helge Hafting
2003-06-29 6:08 ` Mike Galbraith
2003-06-30 13:37 ` Bill Davidsen
2003-06-27 6:54 ` jw schultz
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