Hapus memori ram cache buffer dan swap pada Linux

Tuorial hapus memori ram cache buffer dan swap pada Linux. CentOS 7

1. Clear PageCache.
   # sync; echo 1 > /proc/sys/vm/drop_caches
   
2. Clear dentries and inodes.
   # sync; echo 2 > /proc/sys/vm/drop_caches
   
3. Clear PageCache, dentries and inodes.
   # sync; echo 3 > /proc/sys/vm/drop_caches