Tune and change max open files for Linux

#!/bin/bash

## 文件数限制
ulimit -n
ulimit -Sn
ulimit -Hn

## 最大文件描述符
cat /proc/sys/fs/file-max

## fs.nr_open,进程级别
## fs.file-max,系统级别

## 临时修改
sysctl -w fs.nr_open=100000000
sysctl -w fs.file-max=10000000

## 永久修改
echo "fs.nr_open = 10000000" >> /etc/sysctl.conf
echo "fs.file-max = 11000000" >> /etc/sysctl.conf

## 临时修改最大打开文件数
ulimit -n 10240000

## 查看当前打开的文件数
sysctl fs.file-nr

## 已使用的文件描述符数
cat /proc/sys/fs/file-nr |cut -f1

## 最大线程数
cat /proc/sys/kernel/threads-max

## 已使用的线程数
ps -eLf | wc -l

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