freemem.sh

#!/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 300 ] ; 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 "Nothing to do" >> /var/log/mem.log
fi

版本二：

#!/bin/bash
free=`free -m | awk 'NR==2' | awk '{print $4}'`
if [ $free -le 300 ] ; then
	used=`free -m | awk 'NR==2' | awk '{print $3}'`
    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 "===========================" >> /var/log/mem.log
    echo $(date +%Y-%m-%d" "%H:%M:%S) >> /var/log/mem.log
    echo "Memory usage | [Use：${used}MB] [Free：${free}MB]" >> /var/log/mem.log
    echo "Release [$[`free -m | awk 'NR==2' | awk '{print $4}'` - free]MB]" >> /var/log/mem.log
fi

在crontab 添加定时执行（每小时执行一次）

 * */1 * * * sh /usr/local/freemem.sh

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