釋放內存前

# free -m
???????????? total?????? used?????? free???? shared??? buffers???? cached
Mem:????????? 7831?????? 7704??????? 127????????? 0??????? 256?????? 6813
-/+ buffers/cache:??????? 634?????? 7197
Swap:???????? 7999????????? 0?????? 7999

sync && echo 1 > /proc/sys/vm/drop_caches
sync && echo 2 > /proc/sys/vm/drop_caches
sync && echo 3 > /proc/sys/vm/drop_caches

Writing to this will cause the kernel to drop clean caches, dentries and inodes from memory, causing that memory to become free.

To free pagecache:

* echo 1 > /proc/sys/vm/drop_caches

To free dentries and inodes:

* echo 2 > /proc/sys/vm/drop_caches

To free pagecache, dentries and inodes:

* echo 3 > /proc/sys/vm/drop_caches

As this is a non-destructive operation, and dirty objects are notfreeable, the user should run "sync" first in order to make sure allcached objects are freed.

This tunable was added in 2.6.16.

釋放內存后

# free -m
???????????? total?????? used?????? free???? shared??? buffers???? cached
Mem:????????? 7831??????? 365?????? 7466????????? 0????????? 0???????? 18
-/+ buffers/cache:??????? 346?????? 7485
Swap:???????? 7999????????? 0?????? 7999

轉載于:https://blog.51cto.com/lihongweibj/1616892

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