Bad performance when accessing a lot of small files

[Mike Tancsa]

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 :(

         ---Mike

> >          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
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