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What is swappiness and why the heck should I change it? swappiness is a value between 0 and 100 which controls the priority of your system using ram vs. swap. Making this change will greatly increase the performance of your box! Especially if you have a recent system with lots of ram. A swappiness value of 0 means avoid swap as much as possible and only use ram. A swappiness value of 100 means avoid ram as much as possible and only use swap. By default, Ubuntu is set for swappiness of 60. For desktop users I recommend changing swappiness to a value of 10. For most servers I suggest setting it to a value of 25. If you have 4, 8, or more GB of ram, consider setting your swappiness to 0. Ok, so how to I check my swappiness? Do this command to check your current swappiness value: cat /proc/sys/vm/swappiness You can temporarily change it by issuing: sudo sysctl vm.swappiness=10 To set the value permanently on your box, edit this file: sudo nano /etc/sysctl.conf And put in the value you desire, such as: |
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