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Re: [Gnu-arch-users] Some issues
From: |
Andrew Suffield |
Subject: |
Re: [Gnu-arch-users] Some issues |
Date: |
Wed, 9 Jun 2004 19:41:38 +0100 |
User-agent: |
Mutt/1.5.6+20040523i |
On Wed, Jun 09, 2004 at 08:10:50PM +0200, Florian Weimer wrote:
> * Andrew Suffield:
>
> >> > This is essentially wrong on all the interesting filesystems. It's
> >> > equivalent on most of them, and a little slower to use one large file
> >> > on NTFS and HFS+.
> >>
> >> Huh? What about seek overhead?
> >
> > What seek overhead? There is no strong relationship between "being in
> > the same file" and "being in the same region of the disk",
>
> Wrong, modern file systems try to maintain that relationship.
Wrong, that is not a strong relationship.
> > and no strong repulsion between "being in different files" and
> > "being in the same region of the disk". These things are mostly
> > related to creation pattern, not file membership.
>
> While there are some file systems which group files according to the
> directory they are stored in them, UNIX file systems can hardly do
> this (and tla's hard links would break it anyway).
Right, ext[23] cluster based on creation order, which works out pretty
well for tla. I don't know where you got this "directory" nonsense
from.
> You can compensate for part of this problem if you sort directory
> entries by inode number before accessing them, but it's still much
> worse than just reading a file sequentially.
This is false, and it's also irrelevant, since your proposal was to
read a file randomly.
--
.''`. ** Debian GNU/Linux ** | Andrew Suffield
: :' : http://www.debian.org/ |
`. `' |
`- -><- |
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Re: [Gnu-arch-users] Some issues, Florian Weimer, 2004/06/09
- Re: [Gnu-arch-users] Some issues, Andrew Suffield, 2004/06/09
- Re: [Gnu-arch-users] Some issues, Florian Weimer, 2004/06/09
- Re: [Gnu-arch-users] Some issues, Andrew Suffield, 2004/06/09
- Re: [Gnu-arch-users] Some issues, Florian Weimer, 2004/06/09
- Re: [Gnu-arch-users] Some issues,
Andrew Suffield <=
- Re: [Gnu-arch-users] Some issues, Florian Weimer, 2004/06/09
- Re: [Gnu-arch-users] Some issues, Andrew Suffield, 2004/06/09
- Re: [Gnu-arch-users] Some issues, Florian Weimer, 2004/06/09
- Re: [Gnu-arch-users] Some issues, Matthieu Moy, 2004/06/09
- Re: [Gnu-arch-users] Some issues, Andrew Suffield, 2004/06/09
- Re: [Gnu-arch-users] Some issues, Matthieu Moy, 2004/06/09
- Re: [Gnu-arch-users] Some issues, Andrew Suffield, 2004/06/09
Re: [Gnu-arch-users] Some issues, Ollivier Robert, 2004/06/10
Re: [Gnu-arch-users] Some issues, Florian Weimer, 2004/06/10
Re: [Gnu-arch-users] Some issues, Dustin Sallings, 2004/06/22