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51 lines
1.2 KiB
51 lines
1.2 KiB
4 years ago
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#!/bin/bash
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##### 设置虚拟内存 #####
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##### update：2020/12/22 #####
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##### author:xiaoz<xiaoz93@outlook.com>
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#获取物理内存
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p_mem=`free -m|grep Mem|awk '{print $2}'`
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#获取最佳虚拟内存大小
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#内存如果小于2g，则设置2倍
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if [ $p_mem -lt 2000 ]
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then
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swap_value=$p_mem*2
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elif [ $p_mem -gt 2000 ] && [ $p_mem -lt 8000 ]
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#内存大于2G，小于8G，则设置和物理内存大小一致
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then
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swap_value=$p_mem
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else
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#其他情况，比如大于8G，则设置8G内存
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swap_value=8000
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fi
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#设置swap函数
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function set_swap(){
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#创建swap
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dd if=/dev/zero of=/dev/swap bs=1M count=${swap_value}
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mkswap /dev/swap
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swapon /dev/swap
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#写入分区表
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echo '/dev/swap swap swap defaults 0 0' >> /etc/fstab
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}
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#判断当前是否开启了虚拟内存
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if [ swapon -s ]
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then
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echo 'You have already set up swap, there is no need to repeat the settings.'
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exit
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else
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#设置虚拟内存
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set_swap
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echo '---------------------------------'
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echo 'Swap setup complete.'
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echo '---------------------------------'
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swapon -s
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echo '---------------------------------'
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free -mt
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echo '---------------------------------'
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fi
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exit
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