本文介绍了一种在Linux环境下不重启系统即可释放缓存的方法。通过使用/proc/sys/vm/drop_caches接口，用户可以清除页缓存、inode及dentry缓存。文章提供了具体的命令示例，包括如何同步文件系统缓冲区再进行缓存释放。
Linux Kernels 2.6.16 and up provide a way to instruct the kernel to drop the page cache, inode and dentry caches on command. This tip can help free Linux memory without a reboot.
Note: This is a non-destructive operation. Dirty objects are not freeable, hence; you must run sync beforehand.
To use /proc/sys/vm/drop_caches, you simply echo a number to it.
To free pagecache:
Note: This is a non-destructive operation. Dirty objects are not freeable, hence; you must run sync beforehand.
To use /proc/sys/vm/drop_caches, you simply echo a number to it.
To free pagecache:
Code:
# sync; echo 1 > /proc/sys/vm/drop_caches
To free dentries and inodes:
Code:
# sync; echo 2 > /proc/sys/vm/drop_caches
To free pagecache, dentries and inodes:
Code:
# sync; echo 3 > /proc/sys/vm/drop_caches
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