#!/bin/sh

used=`free -m | awk 'NR==2' | awk '{print $3}'`

free=`free -m | awk 'NR==2' | awk '{print $4}'`




if [ $free -le 50000 ] ; then

echo "===========================" >> /var/log/mem.log

date >> /var/log/mem.log

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

fi