free-up-cache-memory-in-linux

释放linux cached使用内存的方法

free-up-cache-memory-in-linux

# free
             total       used       free     shared    buffers     cached
Mem:       4037464    3953104      84360          0     169812    2696660
-/+ buffers/cache:    1086632    2950832
Swap:      6094840         96    6094744
#

Free the cache memory by issuing this command

sync ; echo 3 > /proc/sys/vm/drop_caches

then checked as below :

# free
             total       used       free     shared    buffers     cached
Mem:       4037464     983772    3053692          0       2488      36728
-/+ buffers/cache:     944556    3092908
Swap:      6094840         96    6094744


备注:

# /proc/sys/vm/drop_caches (since Linux 2.6.16)

#   To free pagecache, use echo 1 > /proc/sys/vm/drop_caches
#   To free dentries and inodes, use echo 2 > /proc/sys/vm/drop_caches
#   To free pagecache, dentries and inodes, use echo 3 > /proc/sys/vm/drop_caches