Shulou(Shulou.com)06/03 Report--

Case description: centos system, buff/cache occupies too much, resulting in high server memory, but through the top view of the system process does not take up too much memory

The actual situation:

Processing steps:

1. Execute the sync command

Sync

two。 Execute the free memory command:

The echo 3 > / proc/sys/vm/drop_caches command explains that the sync command forces the data stored in buffer to be written to the hard disk. Echo 1 > / proc/sys/vm/drop_caches: means to clear pagecache. Echo 2 > / proc/sys/vm/drop_caches: means to clear the objects in the recycled slab allocator (including directory item cache and inode cache). Echo 3 > / proc/sys/vm/drop_caches: means to clear the cache objects in the pagecache and slab allocators.

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