linux quickey -Flush Cache…

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February 15, 2016 by aubreykloppers

Emptying the buffers cache

If you ever want to empty it you can use this chain of commands.

# free && sync && echo 3 > /proc/sys/vm/drop_caches && free

             total       used       free     shared    buffers     cached
Mem:       1018916     980832      38084          0      46924     355764
-/+ buffers/cache:     578144     440772
Swap:      2064376        128    2064248
             total       used       free     shared    buffers     cached
Mem:       1018916     685008     333908          0        224     108252
-/+ buffers/cache:     576532     442384
Swap:      2064376        128    2064248

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
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