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For some reason on my Ubuntu 9.04 desktop, swap memory is turned off. How can I turn it back on?
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For some reason on my Ubuntu 9.04 desktop, swap memory is turned off. How can I turn it back on?
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Check that you have a swap partition defined in /etc/fstab.
$ grep swap /etc/fstab
UUID=14a0f7b9-dabb-4296-b0e7-013527a7d82d none swap sw 0 0
Check that it is being used by the system
$ swapon -s
Filename Type Size Used Priority
/dev/sda6 partition 1004020 215532 -1
If it isn't, check that it is formatted as a swap partition.
$ sudo fdisk -l /dev/sda
[..snipped..]
/dev/sda5 3842 6595 22121473+ 83 Linux
/dev/sda6 6596 6720 1004031 82 Linux swap / Solaris
If it is a swap partition, ready it for use and turn it on. At this point, you might see any errors that prevented its use.
sudo mkswap /dev/sda6
sudo swapon /dev/sda6
Check that the partition is now being used using the swapon -s command from #2.
/dev/sda6 none swap sw 0 0
If you didn't define a swap partition earlier, then you'd have to create one, or point swap to a regular file (less efficient).
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If you have a swap partition defined in /etc/fstab already then sudo swapon -a
If you don't have the swap partition listed in /etc/fstab then sudo swapon device
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A really easy way to do it is with these scripts, or even easier still with:
sudo apt install swapspace -y
Which is a dynamic swapping daemon
Did you installed with Ext4 as filesystem? I read it somewhere that with ext4 and enough ram it's not necessary to have a swap partition anymore. Can't find the link now though. – Decio Lira – 2009-08-13T02:59:13.613
How would a file system be able to avoid swapping? – innaM – 2009-08-13T06:17:23.247
1How do you know that "swap memory is turned off"? – innaM – 2009-08-13T06:18:37.537
the filesystem used and the need of swap is hardly much related – Joakim Elofsson – 2009-08-13T09:19:29.290