Bad performance when accessing a lot of small files
mike at sentex.net
Wed Dec 19 12:14:43 PST 2007
At 03:07 PM 12/19/2007, Alexandre Biancalana wrote:
>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 ?
Hmmm, I dont know. Quite possibly / probably. Based on your values
below, its not hitting the max if it were effected. I dont know
anything about ZFS to know if there is some specific tuning that
needs to be done for many files :(
> > Have you adjusted the dirhash value ? What does
> > sysctl -a vfs.ufs | grep dirhash
># sysctl -a vfs.ufs | grep dirhash
> > show on your box ? Also, do you have a lot of UIDs in your passwd file ?
># wc -l /etc/passwd
> 45 /etc/passwd
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