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  • drop_caches Linux清空缓存 枯木

    drop_caches

    Writing to this will cause thekernel to drop clean caches, dentries and

    inodes from memory, causing thatmemory to become free.

    To free pagecache:

             echo1 > /proc/sys/vm/drop_caches

    To free dentries and inodes:

             echo2 > /proc/sys/vm/drop_caches

    To free pagecache, dentries andinodes:

             echo3 > /proc/sys/vm/drop_caches

    As this is a non-destructiveoperation and dirty objects are not freeable, the

    user should run `sync' first.

    http://www.kernel.org/doc/Documentation/sysctl/vm.txt

    注意:在清空缓存之前使用sync命令同步数据到磁盘

    -------------------------------------------------------------------------------------------------------------------------------

    # cat /proc/sys/vm/drop_caches

    0

    默认是0,1表示清空页缓存,2表示清空inode和目录树缓存,3清空所有的缓存

    # sync
    # free -m
                         total       used       free     shared    buffers     cached
    Mem:           499        323        175          0         52                188
    -/+ buffers/cache:       82        416
    Swap:         2047          0       2047
    # echo 3 > /proc/sys/vm/drop_caches
    # free -m     //发现缓存明显减少了
                        total       used       free     shared    buffers     cached
    Mem:           499         83         415          0          1                17
    -/+ buffers/cache:      64        434
    Swap:         2047          0       2047
    #
    -------------------------------------------------------------------------------------------------------------------------------

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  • 原文地址:https://www.cnblogs.com/kumulinux/p/2808700.html
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