Messages in this thread | | | Date | Wed, 10 Jan 2007 09:57:39 +0800 | From | Fengguang Wu <> | Subject | Re: How git affects kernel.org performance |
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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.
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