swap

Swappiness beállítása

https://en.wikipedia.org/wiki/Swappiness

Ha a géped akkor is swap-el, amikor még gigabájtok vannak szabadon a memóriában, akkor érdemes a swappiness értékét lecsökkenteni.
Ezt vagy a /etc/sysctl.conf-ban, vagy a /etc/sysctl.d mappában egy .conf fájlban kell beállítani.

A lehető legkevesebb automatikus swap-elés:
99-swapiness.conf
```
vm.swappiness = 10
```
Csak 0 szabad RAM esetén swap-eljen:
99-swapiness.conf
```
vm.swappiness = 0
```

A sysctl használatáról itt olvashatsz még.

Swappiness stratégiák

Value Strategy

vm.swappiness = 0 The kernel will swap only to avoid an out of memory condition. See the VM Sysctl documentation.

vm.swappiness = 1 Kernel version 3.5 and over, as well as kernel version 2.6.32-303 and over: Minimum amount of swapping without disabling it entirely.

vm.swappiness = 10 This value is sometimes recommended to improve performance when sufficient memory exists in a system.

vm.swappiness = 60 The default value.

vm.swappiness = 100 The kernel will swap aggressively.

Value	Strategy
`vm.swappiness = 0`	The kernel will swap only to avoid an out of memory condition. See the VM Sysctl documentation.
`vm.swappiness = 1`	Kernel version 3.5 and over, as well as kernel version 2.6.32-303 and over: Minimum amount of swapping without disabling it entirely.
`vm.swappiness = 10`	This value is sometimes recommended to improve performance when sufficient memory exists in a system.
`vm.swappiness = 60`	The default value.
`vm.swappiness = 100`	The kernel will swap aggressively.