centos定时释放内存脚本,centos释放脚本

centos定时释放内存脚本,centos释放脚本

以下是脚本!

#!/bin/bash

used=`free -m | awk ‘NR==2′ | awk ‘{print $3}’`

free=`free -m | awk ‘NR==2′ | awk ‘{print $4}’`

echo “===========================” >> /var/log/mem.log

date >> /var/log/mem.log

echo “Memory usage | [Use：${used}MB][Free：${free}MB]” >> /var/log/mem.log

if [ $free -le 100 ] ; then

sync && echo 1 > /proc/sys/vm/drop_caches

sync && echo 2 > /proc/sys/vm/drop_caches

sync && echo 3 > /proc/sys/vm/drop_caches

echo “OK” >> /var/log/mem.log

else

echo “Not required” >> /var/log/mem.log

fi

然后加入到计划任务中,,每30分钟执行一次.

echo ‘*/30 * * * * sh /bak/sh/freemem.sh’ >> /var/spool/cron/root