40万个文件,共1.6G:
test/为空文件夹
1 rsync --delete-before -a -H -v --progress --stats test/ test_rsync_old_old/ 15.967160108 seconds time elapsed
2 rsync --delete-before -a -H--stats test/ test_rsync_old/ 14.154138616 seconds time elapsed
3 rsync --delete-before -d test/ test_rsync_new/ 19.351759025 seconds time elapsed
4 rm -rf test_rm/* too long
5 ls |xargs rm -f 10.844936178 seconds time elapsed