出于测试目的，我什至提高了 root 的限制。
# /etc/security/limits.conf
* soft nofile 65535
* hard nofile 65535
root soft nofile 65535
root hard nofile 65535
rtorrent 进程由用户“user”运行。
user@localhost:~$ ulimit -n
65535
但是当我查看 rtorrent 的最大打开文件数时：
user@localhost:~$ cat /proc/1141/limits
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 8388608 unlimited bytes
Max core file size 0 unlimited bytes
Max resident set unlimited unlimited bytes
Max processes 15700 15700 …