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Re: [Gnu-arch-users] Some issues
From: |
James Blackwell |
Subject: |
Re: [Gnu-arch-users] Some issues |
Date: |
Wed, 9 Jun 2004 20:18:37 -0400 |
>> Huh? What about seek overhead?
>
Andrew Suffield
> What seek overhead? There is no strong relationship between "being in
> the same file" and "being in the same region of the disk", 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.
512 bytes per sector = 7 arch-ids per sector.
What's more, most interesting filesystems know how to defragment files,
so your seek time goes down.
.
> Interesting filesystems do not seek the head to park and back every
> time they read from a different file. They actually do the opposite,
> and reorder disk accesses to minimise seeks.
Who said they did?
Reordering disk accesses won't make a whit of different to arch until
some date in the future it makes all of those requests concurrantly.
> HFS+ goes further, and shuffles small files around so that the ones
> you use most often are stored near each other; this doesn't work if
> you cram them all into one huge file. (NTFS is just inefficient at
> allocating large files, and tends to scatter them, while small files
> are packed together more densely; yes, its allocation algorithm
> sucks).
A file with 10,000 arch-ids is about 730K. I don't know in who's world
this is considered a "large file".
--
James Blackwell Try something fun: For the next 24 hours, give
Smile more! each person you meet a compliment!
GnuPG (ID 06357400) AAE4 8C76 58DA 5902 761D 247A 8A55 DA73 0635 7400
- Re: [Gnu-arch-users] Some issues, (continued)
- 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
- Re: [Gnu-arch-users] Some issues,
James Blackwell <=
- Re: [Gnu-arch-users] Some issues, Matthieu Moy, 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, James Blackwell, 2004/06/09
- Re: [Gnu-arch-users] Some issues, Miles Bader, 2004/06/09
Re: [Gnu-arch-users] Some issues, Miles Bader, 2004/06/09