清理内存
flushcase.sh：
echo "vm.drop_caches = 1" > /etc/sysctl.conf
#sysctl -p
while [ 1 ]
do
free_size=$(free | grep "Mem"? | awk '{print $4}')
if [ "$free_size" -le "32768" ]
then
?sync
?#date
?#echo stb current free size=$free_size
?echo 1 > /proc/sys/vm/drop_caches
fi
sleep 1
done
#To free pagecache:
#echo 1 > /proc/sys/vm/drop_caches
#To free dentries and inodes:
#echo 2 > /proc/sys/vm/drop_caches
#To free pagecache, dentries and inodes:
#echo 3 > /proc/sys/vm/drop_caches
