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Linux Swap and memory

Clear / clean swap

Clear PageCache only (more safe for ptoduction)

# sync; echo 1 > /proc/sys/vm/drop_caches

Clear dentries and inodes.

# sync; echo 2 > /proc/sys/vm/drop_caches

Clear PageCache, dentries and inodes.

# sync; echo 3 > /proc/sys/vm/drop_caches

Another way

If you want to clear Swap space, you may like to run the below command.

# swapoff -a && swapon -a