本文介绍了在Linux系统中如何释放操作系统的缓存。通过向/proc/sys/vm/drop_caches文件写入不同的数值，可以实现释放页缓存、dentries、inodes或者全部。这是一个安全的操作，只会释放未被使用的资源，脏对象会在写入磁盘后才被释放。
Sometimes, we have such a situation happening with droping the OS cache. We may usually tell the OS to use direct io or unbuffered reads and writes. How to drop
the OS caches?
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
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
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.
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