Ext3 users - Jan 2003 - RE: ext3fs still uses sequential search of file names in director

I'm NOT the authority here, but AFAIK, Htree is presently 
available only as a patch for 2.4 kernels (which includes 
RH8).  I think that Htree was still beta code at the time 
RH8 was frozen (and may still be, from RedHat's perspective). 
I do not have the impression that the Htree patch has been 
applied in any standard RedHat kernels or kernel updates.  
I hope I am wrong, and that someone will enlighten me.
A. Becker


Parker Johnson <pjohnson@listen.com> wrote:
> 
> Didn't hear back from anyone regarding if there is a way to
determine if I
> am running the ext3fs with htree.  Is there a way I can do it
without
> checking the src code since I am running the precompired redhat
kernel with
> 8.0?	Perhaps an entry under /proc somewhere?
> 
> Pj
> 
> -----Original Message-----
> From: Parker Johnson 
> Sent: Tuesday, January 14, 2003 3:34 PM
> To: 'Andreas Dilger'; Parker Johnson
> Cc: 'ext3-users@redhat.com'; Ops
> Subject: RE: ext3fs still uses sequential search of file names in
> directories?
> 
> 
> 
> Andreas was kind enough to point out that not neccesarily all ext3fs
have
> htrees ready to go.  I am running redhat8.0 out of the box.  How can
I check
> if ext3fs with htrees is running?  I can download the kernel source,
but I
> don't know what options were used when it was built by redhat.
> 
> Thanks much for all of your help.
> -Parker
> 
> 
> 
> 
> -----Original Message-----
> From: Andreas Dilger [mailto:adilger@clusterfs.com]
> Sent: Tuesday, January 14, 2003 2:12 PM
> To: Parker Johnson
> Cc: 'ext3-users@redhat.com'; Ops
> Subject: Re: ext3fs still uses sequential search of file names in
> directories?
> 
> 
> On Jan 14, 2003  13:43 -0800, Parker Johnson wrote:
> > I am trying to determine the optimal filesystem for accessing
large
> numbers
> > of files (25,000+) in a single directory.  I have read that ext3fs
uses a
> > sequential search algorithm and wanted to verify that this was
still
> indeed
> > the case since this article was published a year ago.
> 
> Not necessarily (depends on kernel/filesystem config).  Please
search for
> "htree" and/or enable the indexed directory feature in the 2.5 or
patched
> 2.4 kernel.
> 
> Cheers, Andreas
> --
> Andreas Dilger
> http://sourceforge.net/projects/ext2resize/
> http://www-mddsp.enel.ucalgary.ca/People/adilger/
> 
> 
> 
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