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Set swappiness factor for kernel.
A number of Linux kernel developers recently debated "swapiness" at length on the lkml, exploring when an application should or should not be swapped out, versus reclaiming memory from the cache. Fortunately a run-time tunable is available through the proc interface for anyone needing to adapt kernel behavior to their own requirements. To tune, simply echo a value from 0 to 100 onto /proc/sys/vm/swappiness. The higher a number set here, the more the system will swap.
View current swappiness factor
To view the current swappiness factor run this as root.
Change swappiness factor
echo 10 > /proc/sys/vm/swappiness
Change the 10 above to whatever you want.
Making the change permanent
This is made permanent by adding "vm.swappiness=10" to "/etc/sysctl.conf"
2007-10-04, T. Sneddon