Or, rm?
Disk,
root@bubu $ mount /dev/sda1 on / type ext3 (rw,noatime,nodiratime,acl,user_xattr,data=writeback)
Kernel scheduling,
root@bubu $ cat /sys/block/sda/queue/scheduler noop anticipatory [deadline] cfq
Directory to remove,
root@bubu $ ls -l 0A/ | wc -l 25601
those 25061 nodes is only an empty directory, it was a squid empty cache.
Time to remove all nodes in directory,
root@bubu $ time rm -rf 0A/ real 5m12.053s user 0m0.155s sys 0m8.857s
NOTE TO MYSELF: never use ext3 for database, proxy, or any disk related machine.
TODO: try another file system (?)