To clear the filesystem's memory cache, run the following commands:
[root@development ~]# sync [root@development ~]# echo 3 > /proc/sys/vm/drop_caches [root@development ~]# echo 0 > /proc/sys/vm/drop_caches [root@development ~]# sync
To clear the swap space, run the following command:
[root@development ~]# swapoff -a && swapon -a
For daily automation, paste the above two commands in your cron jobs, such as the following:
0 1 * * * /sbin/swapoff -a && /sbin/swapon -a 0 0 * * * /bin/sync; echo 3 > /proc/sys/vm/drop_caches; echo 0 > /proc/sys/vm/drop_caches; /bin/sync
Note : i use CentOS 6.4 with root privilege
Hope these tricks helps
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