On Tue, Jan 09, 2007 at 08:23:32AM -0800, Linus Torvalds wrote:
>
>
> On Tue, 9 Jan 2007, Fengguang Wu wrote:
> > >
> > > The fastest and probably most important thing to add is some readahead
> > > smarts to directories --- both to the htree and non-htree cases. If
> >
> > Here's is a quick hack to practice the directory readahead idea.
> > Comments are welcome, it's a freshman's work :)
>
> Well, I'd probably have done it differently, but more important is whether
> this actually makes a difference performance-wise. Have you benchmarked it
> at all?
Yes, a trivial test shows a marginal improvement, on a minimal debian system:
# find / | wc -l
13641
# time find / > /dev/null
real 0m10.000s
user 0m0.210s
sys 0m4.370s
# time find / > /dev/null
real 0m9.890s
user 0m0.160s
sys 0m3.270s
> Doing an
>
> echo 3 > /proc/sys/vm/drop_caches
>
> is your friend for testing things like this, to force cold-cache
> behaviour..
Thanks, I'll work out numbers on large/concurrent dir accesses soon.
Regards,
Wu
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