Re: [Gnu-arch-users] Some issues

[Andrew Suffield]

On Wed, Jun 09, 2004 at 08:50:46PM +0200, Florian Weimer wrote:
> * Andrew Suffield:
> 
> > Right, ext[23] cluster based on creation order, which works out pretty
> > well for tla.
> 
> It doesn't on recent ext3 because ext3 reads the files in directory
> order which is completely random thanks to hashing.
> 
> >> 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,
> 
> No, it's not.  Have a look at that mutt patch that sorts Maildir
> access by inode number.  It's a huge win.

All of which is completely irrelevant. tla almost never reads all the
files in a directory in a project tree, and certainly it is not
impeded by seek time when it does so; that operation is constrained by
disk bandwidth.

> > since your proposal was to read a file randomly.
> 
> Oh, was it?  I don't think so.

Yes, you were advocating reimplementing the filesystem within tla, in
order to reduce inode consumption and "improve performance".

Do you have anything relevant to add?

-- 
  .''`.  ** Debian GNU/Linux ** | Andrew Suffield
 : :' :  http://www.debian.org/ |
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