Re: dentry bloat.

[Matt Mackall <mpm@selenic.com>]

On Sun, May 09, 2004 at 08:35:55AM -0700, Linus Torvalds wrote:
> 
> 
> On Sun, 9 May 2004, Guennadi Liakhovetski wrote:
> 
> > On Sat, 8 May 2004, Linus Torvalds wrote:
> > 
> > >    1:     5.04 % (    5.04 % cum -- 2246)
> > >    2:     5.19 % (   10.23 % cum -- 2312)
> > 
> > Ok, risking to state the obvious - it was intentional to count "."s and
> > ".."s, wasn't it? Just this makes it a bit non-trivial to compare this
> > statistics with Andrew's.
> 
> Ok, here's a version that doesn't count "." and "..". My numbers don't 
> really change much for the kernel:
> 
> and we've reached over 90% coverage with the 24-byte inline name.

I hacked up something and ran it on my webserver (which has something
like 200 shell accounts). My histogram peaked at 12 rather than 10 but
still hit 90% cumulative at 21 characters.

I suspect worst case is a large LAN fileserver with Samba shares and
whatnot, I suspect there are a large number of "A picture of my cute
puppy I took last summer.JPG" style filenames there. Anyone have stats
for such an FS?

-- 
Matt Mackall : http://www.selenic.com : Linux development and consulting