Re: 5000 Folders in a directory

[<tomas@tuxteam.de>]

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On Wed, Feb 17, 2016 at 08:13:23PM +0100, Chris wrote:
> Dear All,
> 
> is it possible to save 5000 folders in the same directory (ext4 FS)
> without any performance issues?

I think ext3/ext4 should take that without problems. This is on my
netbook, not particularly  fast disk (LUKS encrypted):

  tomas@rasputin:~$ mkdir foo
  tomas@rasputin:~$ cd foo
  tomas@rasputin:~/foo$ time ( for i in $(seq 0 4999) ; do touch $i ; done )
  
  real    0m21.767s
  user    0m5.324s
  sys     0m3.824s
  tomas@rasputin:~/foo$ time touch bar
  
  real    0m0.006s
  user    0m0.000s
  sys     0m0.000s
  tomas@rasputin:~/foo$ time ls 3795
  3795
  
  real    0m0.007s
  user    0m0.004s
  sys     0m0.004s
  tomas@rasputin:~/foo$ 
  tomas@rasputin:~/foo$ cd ..
  tomas@rasputin:~$ time rm -Rf foo

  real    0m0.122s
  user    0m0.000s
  sys     0m0.116s

The creation time averages to 4.35 ms, btw.

Such big directories were a problem before dirhashes were introduced in
ext3, if memory serves.

regards
- -- tomás
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