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How to Clear Swap on Linux

Switching SWAP on and off can release and clear the space.
  1. Check SWAP space before bouncing.
    2. [root@localhost ~]# free
                 total       used       free     shared    buffers     cached
    ...
    Swap:      1048568       5960    1042608
  2. Disable and enable SWAP.
    3. [root@localhost ~]# swapoff -a; swapon -a
  3. Check SWAP space after bouncing.
    4. [root@localhost ~]# free
                 total       used       free     shared    buffers     cached
    ...
    Swap:      1048568          0    1048568
You can see SWAP is refreshed.
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