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By default, there are various caches like RAM, swap space, Buffer, etc.
Those cache will be saved in /proc/sys/vm/drop_caches
To clear, run the below commands:
# sync; echo 1 > /proc/sys/vm/drop_caches [For Pagecache]
# sync; echo 2 > /proc/sys/vm/drop_caches [For inodes]
# sync; echo 3 > /proc/sys/vm/drop_caches [For both]
# swapoff -a [For swap cache]
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