Modify the swappiness of the Linux swap space to reduce the cache on the hard disk

(2010-01-12 17:21:31) reproduced

Tags: swap swappiness it

Category: Linux

Linux uses a portion of the hard disk as a swap partition for process scheduling--the process is a running program--standby the currently unused process to ' wait ', or even ' sleep ', once it is used and then adjusted to ' Active ', the process of sleeping sleeps in the swap zone, emptying the memory out of the ' activity ' process.
If the memory is large enough, you should tell Linux not to use SWAP partitions too much, and you can modify the value of the swappiness. Swappiness=0 means to maximize the use of physical memory, then the swap space, swappiness=100 when the active use of the swap partition, and the memory of the data in a timely manner into the swap space.
In Ubuntu, the default setting swappiness this value equals 60.
　　
!!!! If the memory is small, and the process is scheduled frequently, the hard disk will be loud!!!!
　　
Now generally 1 g of memory can be modified to 10, 2 G can be changed to 5, or even 0. Specifically, do this:
1. Check the swappiness in your system
$ cat/proc/sys/vm/swappiness
No accident, you should see it's 60.
2. Modify the Swappiness value to 10
$ sudo sysctl vm.swappiness=10
But this is only a temporary change, after you restart the system will restore the default of 60, for peace and stability, but also further:
$ sudo gedit/etc/sysctl.conf
Add such a line at the end of this document:
vm.swappiness=10
Then save, restart. OK, your settings are in effect.

Modify the swappiness of the Linux swap space to reduce the cache on the hard disk