On pá 10. dubna 2009, Klaus Ethgen wrote:
> Hi,
>
> Am Fr den 10. Apr 2009 um 15:55 schrieb Vladimir Nadvornik:
> > > I encountered a other situation where it comes into trouble. When you
> > > open a collection (that can be from many files from many directories)
> > > then the stat probe is still done. Do you have a idea how to improve
> > > that?
> >
> > Other possibility is to read complete directory even if the collection
> > contains just one file from it.
>
> That would be cheaper. That just needs one read of the directory once
> for each file (without other optimisation) instead of 216 reads followed
> by 216 stats of mostly not existing files. (The read of the directory
> will be done by the os just before the stat.) So this would improve the
> performance by ~200.
>

Is it really so slow? AFAIK most of distributions use ext3 with dir_index 
option and my (very limited) testing on this filesystem showed that stat 
speed is comparable to hash table lookup.

Vladimir


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