We have the following 3 ways to delete a build directory:
* rm -fr build
* find -delete build
* rsync -a --delete emtpy_dir build
I've heard that rsync is the fastest way for removing millions of files,
so I did a test on removing the build dir:
* Host info:
$ cat /etc/issue
Ubuntu 14.04.4 LTS \n \l
$ rm --version
rm (GNU coreutils) 8.21
$ find --version
find (GNU findutils) 4.4.2
$ rsync --version
rsync version 3.1.0 protocol version 31
* Do a build
$ . oe-init-build-env build
$ bitbake core-image-minimal
* Size:
$ du -sh build
22G
* Files amount:
$ find build -type f | pv -l >/dev/null
2.61M
2.61 millions files
* Make 3 copies:
$ cp -r build build_copy_1
$ cp -r build build_copy_2
$ cp -r build build_copy_3
* Remove them:
$ time rm -fr build_copy_1/
real 3m26.249s
user 0m4.612s
sys 1m1.704s
$ time find build_copy_2/ -delete
real 3m6.771s
user 0m4.236s
sys 0m59.592s
$ time rsync -a --delete empty/ build_copy_3/
real 5m7.115s
user 0m8.612s
sys 1m13.928s
We can see that find -delete is the fastest way, rsync is the slowest one,
and rm is close to find. Maybe it is because find and rsync are improved in
nowadays, so they are faster than rsync.
--
Thanks
Robert
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