Removing 1MM files

[Robert Citek]

Scott retweeted about removing 1MM files[1]. So I thought I'd try it out:

$ cd /tmp
$ mkdir tmp
$ cd tmp
$ time -p seq -f "%05g" 1 1000000 | xargs touch
real 23.99
user 1.70
sys 15.74

$ cd /tmp
$ cd tmp
$ time -p ls -U | xargs rm
real 737.51
user 1.52
sys 22.66

$ cd /tmp
$ time -p rm -rf tmp
real 20.63
user 0.36
sys 7.35

$ cd /tmp
$ mkdir empty
$ time -p rsync -a --delete empty/ tmp/
real 25.69
user 1.38
sys 10.75

/tmp is an ext4 filesystem. I got very different results on the Mac.
Took much longer.

[1] https://twitter.com/scottgranneman/status/340859906368364544

Regards,
- Robert
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