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59 lines
1.4 KiB
59 lines
1.4 KiB
#!/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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declare -i p_mem |
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declare -i get_swap |
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declare -i swap_value |
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p_mem=`free -m|grep Mem|awk '{print $2}'` |
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#获取虚拟内存大小 |
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get_swap=`free -mt|grep 'Swap'|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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#乘号签名必须加\ |
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swap_value=`expr $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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chmod 600 /dev/swap |
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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 [ $get_swap == 0 ] |
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then |
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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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else |
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echo '---------------------------------' |
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echo 'You have already set up swap, there is no need to repeat the settings.' |
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fi |
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exit |