Re: [Emacs-diffs] master 11cf3e9: Implement a new function directory-files-recursively

[Lars Magne Ingebrigtsen]

Thierry Volpiatto <address@hidden> writes:

> I am not sure the speed is 10X faster vs directory-files, especially
> when sorting the resulting list of `file-name-all-completions'.

I benchmarked a bit with

# for i in `seq 1 3`; do echo $i > /proc/sys/vm/drop_caches; done

in between each run to flush the cache.  This is on a machine with an
SSD.

`file-name-all-completions' version:

(benchmark-run 1 (length (directory-files-recursively "~/" "ChangeLog")))
=> (38.707872137 204 2.599332819999997)

`directory-files' + `file-directory-p' version:

(benchmark-run 1 (length (directory-files-recursively-dir "~/" "ChangeLog")))
=> (89.957997652 1483 25.952981247000064)

So it's faster.  The difference is probably more significant on a
mechanical disk.

-- 
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   bloggy blog: http://lars.ingebrigtsen.no