释放内存前
# 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
释放内存后
# free -m
total used free shared buffers cached
Mem: 7831 365 7466 0 0 18
-/+ buffers/cache: 346 7485
Swap: 7999 0 7999
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原文地址:http://lihongweibj.blog.51cto.com/6235038/1616892