主要參考了http://www.slashroot.in/which-is-the-fastest-method-to-delete-files-in-linux
首先建立50萬個文件
? test for i in $(seq 1 500000);do echo text >>$i.txt;done
1. rm
? test time rm -f * zsh: sure you want to delete all the files in /home/hungerr/test [yn]? y zsh: argument list too long: rm rm -f * 3.63s user 0.29s system 98% cpu 3.985 total
由于文件數(shù)量過多,rm不起作用。
2. find
? test 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分鐘,我的電腦。。。。。。邊看視頻邊刪的。
3. find with delete
? test time find ./ -type f -delete find ./ -type f -delete 0.43s user 11.21s system 2% cpu 9:13.38 total
用時9分鐘。
4. rsync
首先建立空文件夾blanktest
? ~ time rsync -a --delete blanktest/ test/ rsync -a --delete blanktest/ test/ 0.59s user 7.86s system 51% cpu 16.418 total
16s,很好很強大。
5. Python
1 2 3 4 5 6 7 8 9 10 | import os
import timeit
def 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)
|
1 2 | ? ~ python test.py
529.309022903
|
大概用時9分鐘。
6. Perl
? test time perl -e 'for(<*>){((stat)[9]<(unlink))}' perl -e 'for(<*>){((stat)[9]<(unlink))}' 1.28s user 7.23s system 50% cpu 16.784 total
16s,這個應(yīng)該最快了。
統(tǒng)計一下:
命令 | 耗費時間 |
---|
rm | 文件數(shù)量太多,不可用 |
find with -exec | 50萬文件耗時43分鐘 |
find with -delete | 9分鐘 |
Perl | 16s |
Python | 9分鐘 |
rsync with -delete | 16s |