用free命令查看內(nèi)存時，發(fā)現(xiàn)cached占用量過大瘸羡。
釋放腳本如下：
#!/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
將腳本保存到 /root/systemtools/freemem.sh
將腳本添加到crond任務(wù)，定時執(zhí)行:
# echo "*/30 * * * * root /root/systemtools/freemem.sh" >> /etc/crontab
