From: Pavel Machek <pavel@Elf.mj.gts.cz>
To: H.H.vanRiel@fys.ruu.nl
Cc: linux-mm@kvack.org
Subject: Re: pageable page tables
Date: Wed, 17 Dec 1997 22:14:25 +0100 [thread overview]
Message-ID: <19971217221425.30735@Elf.mj.gts.cz> (raw)
In-Reply-To: <Pine.LNX.3.91.971212074748.466A-100000@mirkwood.dummy.home>; from Rik van Riel on Fri, Dec 12, 1997 at 07:57:16AM +0100
Hi!
> > Not sure this is good idea.
>
> Many systems use something like NQS for large jobs, but
> this would be a nice scheme for 'medium' jobs. The
> machine at our school, for instance, has a 5minute CPU
> limit (per process)...
> Doing a large compile (glibc :-) on such a machine would
> not only fail, but it would also annoy other users. This
> SCHED_BG scheme doesn't really load the rest of the system...
No, it would not fail, as no single process eats 5 minutes. And even
with SCHED_BG you would load rest of the system: you would load disk
subsystem. Often, disk subsystem is more important than CPU.
> > > And when free memory stays below free_pages_low for more
> > > than 5 seconds, we can choose to have even normal processes
> > > queued for some time (in order to reduce paging)
>
> someone else have an opinion on this?
Too many heuristics?
Pavel
--
I'm really pavel@atrey.karlin.mff.cuni.cz. Pavel
Look at http://atrey.karlin.mff.cuni.cz/~pavel/ ;-).
next prev parent reply other threads:[~1997-12-17 21:31 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <19971210161108.02428@Elf.mj.gts.cz>
1997-12-12 6:57 ` Rik van Riel
1997-12-17 21:14 ` Pavel Machek [this message]
[not found] ` <Pine.LNX.3.91.971218000000.887A-100000@mirkwood.dummy.home>
1997-12-18 13:33 ` Pavel Machek
1997-12-18 14:46 ` SCHED_BG Rik van Riel
1997-12-18 6:01 pageable page tables Benjamin LaHaise
[not found] <19971209122346.02899@Elf.mj.gts.cz>
1997-12-09 14:37 ` Rik van Riel
1997-12-09 14:41 ` Rik van Riel
[not found] <Pine.LNX.3.95.971126091603.8295A-100000@gwyn.tux.org>
1997-11-27 13:07 ` Rik van Riel
1997-11-27 18:23 ` Alan Cox
1997-11-27 18:56 ` Chris Evans
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