Bad performance when accessing a lot of small files

[Alexandre Biancalana]

On 12/19/07, Mike Tancsa <mike at sentex.net> wrote:
> At 02:09 PM 12/19/2007, Alexandre Biancalana wrote:
>
> >The behavior that I'm observing and that want your help is when the
> >system is accessing some directory with many small files ( directories
> >with ~ 1 million of ~30kb files), the performance is very poor.
>
> Hi,

I'm using zfs, I think this change the things.. no ?

>          Have you adjusted the dirhash value ? What does
>
>   sysctl -a vfs.ufs | grep dirhash

# sysctl -a vfs.ufs | grep dirhash
vfs.ufs.dirhash_docheck: 0
vfs.ufs.dirhash_mem: 1410338
vfs.ufs.dirhash_maxmem: 2097152
vfs.ufs.dirhash_minsize: 2560


>
> show on your box ?  Also, do you have a lot of UIDs in your passwd file ?

No.

# wc -l /etc/passwd
      45 /etc/passwd