Linux 下海量文件删除方法效率对比，本次参赛选手一共6位，分别是：rm、find、find with delete、rsync、Python、Perl.
首先建立50万个文件
$ test for i in $(seq 1 500000);do echo text >>$i.txt;done- rm 删除
$ time rm -f *zsh: sure you want to delete all the files in /home/hungerr/test [yn]? yzsh: argument list too long: rmrm -f * 3.63s user 0.29s system 98% cpu 3.985 total# 由于文件数量过多，rm不起作用。- find 删除
$ time find ./ -type f -exec rm {} \; find ./ -type f -exec rm {} \; 49.86s user 1032.13s system 41% cpu 43:19.17 total# # 大概43分钟,我的电脑。。。。。。边看视频边删的。- find with delete
$ time find ./ -type f -deletefind ./ -type f -delete 0.43s user 11.21s system 2% cpu 9:13.38 total# 用时9分钟。- rsync 删除
# 首先建立空文件夹blanktest$ time rsync -a --delete blanktest/ test/rsync -a --delete blanktest/ test/ 0.59s user 7.86s system 51% cpu 16.418 total16s，很好很强大。- Python 删除
import osimport timeitdef main(): for pathname,dirnames,filenames in os.walk('/home/username/test'): for filename in filenames: file=os.path.join(pathname,filename) os.remove(file) if __name__=='__main__':t=timeit.Timer('main()','from __main__ import main')print t.timeit(1) $ python test.py529.309022903# 大概用时9分钟。- Perl 删除
$ time perl -e 'for(<*>){((stat)[9]<(unlink))}'perl -e 'for(<*>){((stat)[9]<(unlink))}' 1.28s user 7.23s system 50% cpu 16.784 total16s，这个应该最快了。测试结果
- rm：文件数量太多，不可用
- find with -exec 50万文件耗时43分钟
- find with -delete 9分钟
- Perl 16sPython 9分钟
- rsync with -delete 16s
结论：删除大量小文件rsync最快，最方便
