linux中open file size的臨時更改和永久更改

在centos系統下進行，首先通過ulimit -a查看系統的一些參數設置：

[root@localhost blktrace100G]# ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 127249
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 127249
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

如果想把open file size的大小設置爲65535，則可以通過下面的指令進行臨時更改：

ulimit -n 65535

然後進行ulimit -a查看：

[root@localhost blktrace100G]# ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 127249
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 65535
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 127249
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

但是這個只是臨時的，如果想要進行永久的更改就執行下面指令：

vim /etc/profile
    在文件末尾加入ulimit –n 65535
source /etc/profile

其他參數的永久性修改和這個相同。