今天用spot on light 查了一下开发服务器的内存占用，只剩下60MB，用下面的方法就可以实现清空缓存频繁的文件访问会导致系统的Cache使用量大增。接下来是小编为大家收集的linux系统清理缓存教程，欢迎大家阅读：

　　linux系统清理缓存教程

　　命令

　　#sync

　　#echo 3 > /proc/sys/vm/drop_caches

　　查看内存情况：

　　# more /proc/meminfo

　　Kernels 2.6.16 and newer provide a mechanism to have the kernel drop the page cache and/or inode and dentry caches on command, which can help free up a lot of memory. Now you can throw away that script that allocated a ton of memory just to get rid of the cache...

　　To use /proc/sys/vm/drop_caches, just echo a number to it.

　　To free pagecache:

　　# echo 1 > /proc/sys/vm/drop_caches

　　To free dentries and inodes:

　　# echo 2 > /proc/sys/vm/drop_caches

…… 此处隐藏0字 ……

　　To free pagecache, dentries and inodes:

　　echo 3 > /proc/sys/vm/drop_caches

　　This is a non-destructive operation and will only free things that are completely unused. Dirty objects will continue to be in use until written out to disk and are not freeable. If you run "sync" first to flush them out to disk, these drop operations will tend to free more memory.

　
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