Emptying buffers cache and swap

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Emptying the buffers cache

You can signal the Linux Kernel to drop various aspects of cached items by changing the numeric argument to the above command.
  • To free pagecache:
    # echo 1 > /proc/sys/vm/drop_caches
  • To free dentries and inodes:
    # echo 2 > /proc/sys/vm/drop_caches
  • To free pagecache, dentries and inodes:
    # echo 3 > /proc/sys/vm/drop_caches

Swap

If you want to clear out your swap you can use the following commands.
$ free
             total       used       free     shared    buffers     cached
Mem:       7987492    7298164     689328          0      30416     457936
-/+ buffers/cache:    6809812    1177680
Swap:      5963772     609452    5354320
Then use this command to disable swap:
$ swapoff -a
You can confirm that it's now empty:
$ free
             total       used       free     shared    buffers     cached
Mem:       7987492    7777912     209580          0      39332     489864
-/+ buffers/cache:    7248716     738776
Swap:            0          0          0
And to re-enable it:
$ swapon -a
And now reconfirm with free:
$ free
             total       used       free     shared    buffers     cached
Mem:       7987492    7785572     201920          0      41556     491508
-/+ buffers/cache:    7252508     734984
Swap:      5963772          0    5963772

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