linux查看修改系统文件描述符

统计当前进程打开文件数

[...]# lsof -p PID |  wc -l

查看当前系统最大文件数

[...]# 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) 3878
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 100001
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) 3878
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

open files                      (-n) 100001

查看/etc/security/limits.conf

# End of file
* soft nofile 100001
* hard nofile 100002
root soft nofile 100001
root hard nofile 100002

查看/etc/security/limits.d/20-nproc.conf

#*          soft    nproc     4096
#root       soft    nproc     unlimited

查看当前进程的 limits文件：

cat /proc/PID/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             3878                 3878                 processes
Max open files            51200                51200                files
Max locked memory         65536                65536                bytes
Max address space         unlimited            unlimited            bytes
Max file locks            unlimited            unlimited            locks
Max pending signals       3878                 3878                 signals
Max msgqueue size         819200               819200               bytes
Max nice priority         0                    0
Max realtime priority     0                    0
Max realtime timeout      unlimited            unlimited            u

Max open files            51200                51200                files

修改文件描述符数值：
vi /etc/security/limits.conf

* soft nofile 65536
* hard nofile 65536

然后重新登陆，输入ulimit -a命令查询。

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