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[Python-Dev] Issue 11406: adding os.scandir(), a directory iterator returning stat-like info

Antoine Pitrou solipsis at pitrou.net
Tue May 14 12:34:25 CEST 2013 
Le Tue, 14 May 2013 22:14:42 +1200,
Ben Hoyt <benhoyt at gmail.com> a écrit :
> >> It should be no slower when it's all moved to C.
> >
> > The slowdown is too small to be interesting. The main point is that
> > there was no speedup, though.
> 
> True, and thanks for testing.
> 
> I don't think that's a big issue, however. If it's 3-8x faster in the
> majority of cases (local disk on all systems, Windows networking), and
> no slower in a minority (sshfs), I'm not too sad about that.
> 
> I wonder how sshfs compared to nfs.

Ok, with a NFS mount (default options, especially "sync") to the same
local VM:

First run:
os.walk took 17.137s, scandir.walk took 0.625s -- 27.4x as fast

Second run:
os.walk took 1.535s, scandir.walk took 0.617s -- 2.5x as fast

(something fishy with caches?)

Regards

Antoine.
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