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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 11:57:16 CEST 2013 
Le Tue, 14 May 2013 21:10:08 +1200,
Ben Hoyt <benhoyt at gmail.com> a écrit :
> > On a locally running VM:
> > os.walk took 0.400s, scandir.walk took 0.120s -- 3.3x as fast
> >
> > Same VM accessed from the host through a local sshfs:
> > os.walk took 2.261s, scandir.walk took 2.055s -- 1.1x as fast
> >
> > Same, but with "sshfs -o cache=no":
> > os.walk took 24.060s, scandir.walk took 25.906s -- 0.9x as fast
> 
> Thanks. I take it those are "USING FAST C version"?

Yes.

> What is "-o cache=no"? I'm guessing the last one isn't giving dirents,
> so my version is slightly slower than the built-in listdir/stat
> version due to building and calling methods on the DirEntry objects in
> Python.

It disables sshfs's built-in cache (I suppose it's a filesystem
metadata cache). The man page doesn't tell much more about it.

> 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.

Regards

Antoine.
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