Linux 释放 内存

释放前
[root@selboo ~]# free  -m
             total       used       free     shared    buffers     cached
Mem:          3042       2939        103          0        157       1571
-/+ buffers/cache:       1209       1832
Swap:         2047          0       2047

[root@selboo ~]# sync
[root@selboo ~]# echo 3 > /proc/sys/vm/drop_caches

释放后
[root@selboo ~]# free  -m
             total       used       free     shared    buffers     cached
Mem:          3042       1142       1900          0          0         22
-/+ buffers/cache:       1119       1922
Swap:         2047          0       2047
[root@selboo ~]# echo 0 > /proc/sys/vm/drop_caches  

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