VM release buffer / cache memory

 

1 echo> / proc / SYS / vm / drop_caches   # Clears pagecache. 
2 echo> / proc / SYS / VM / drop_caches   # represents scavenged slab allocator object (including a cache directory entry and the inode cache). 
　　　　　　　　　　　　　　　　　　　　　　The slab allocator is a mechanism in the kernel memory management, cache data to achieve many of which are used in pagecache. 
. 3 echo> / proc / SYS / VM / drop_caches   # clear the cache object and pagecache slab dispenser.