定时释放Linux/CentOS缓存

 

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#!/bin/bash  used=`free -m | awk 'NR==2' | awk '{print $3}'`  free=`free -m | awk 'NR==2' | awk '{print $4}'`      echo "===========================" >> yl_dropcaches.log  date >> yl_dropcaches.log  echo "Memory usage | [Use：${used}MB][Free：${free}MB]" >>  yl_dropcaches.log      # drop caches when the free memory less than 10G  if [ $free -le 10000 ] ; 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" >>  yl_dropcaches.log  else   echo "Not required" >> yl_dropcaches.log  fi

　　

 

https://www.cnblogs.com/zxc2man/p/8175952.html

 

https://blog.csdn.net/e_wsq/article/details/79905221

 

https://blog.csdn.net/jfb53440/article/details/79171941