Now, I am using ubuntu 14.04 with 512 RAM and Swap 512 too. I want to change my swap to 1 GB. Can anyone help me ? Should I repeat this step on this article with different size ?
https://www.digitalocean.com/community/tutorials/how-to-add-swap-on-ubuntu-14-04
You could just delete the file and start from scratch, but if you just want to resize it you can do that as well. Just remember to disable it with swapoff first. For example:
# sudo swapon -s
Filename Type Size Used Priority
/swapfile file 1048572 0 -1
# sudo swapoff /swapfile
# sudo fallocate -l 4G /swapfile
# sudo mkswap /swapfile
Setting up swapspace version 1, size = 4194300 KiB
no label, UUID=fb0aadaf-b52f-4928-b57f-c60ef7a0bd49
# sudo swapon /swapfile
# sudo swapon -s
Filename Type Size Used Priority
/swapfile file 4194300 0 -1
Thanks for answer.
When I run
sudo swapoff /swapfile
I got :
swapoff: /swapfile: swapoff failed: Cannot allocate memory
When I delete it with :
sudo rm -rf /swapfile
I got :
rm: cannot remove ‘/swapfile’: Operation not permitted
Why this happen ?
This maybe caused by insufficient free memory when turning off swap.
You may try to create another swap file and turn it on then turn off the old swap.
sudo fallocate -l 4G /swapfile4G
sudo mkswap /swapfile4G
sudo swapon /swapfile4G
sudo swapoff /swapfile # < old swapfile
sudo rm /swapfile
sudo swapon -s # verify
# After all edit your /etc/fstab, if you use it to turn on swap when reboot, to switch /swapfile to /swapfile4G
this worked for me, having the issue of not being able to straight swapoff the current file without making a new one
I tried to delete my old swap in /etc/fstab and the code which I delete is
/swapfile none swap sw 0 0
Then create the new swap with 1 GB, and repeat the step in the article above.
Now, everything is better.
Thank you for helping.
2didit:
While switching off the swap, the running apps, doesn't know to take which memory.
Try to drop all caches from memory, but maybe first stop all main apps and then drop caches:
echo "3" > /proc/sys/vm/drop_caches
wait... for like a min, then
echo "0" > /proc/sys/vm/drop_caches
and check if you can swap off after.
// http://www.linuxquestions.org/questions/linux-server-73/problem-with-swapoff-a-860137/
Thanks @TonyTsang this is exactly what I was looking for. With your instructions I was able to increase my swapfile size from 3GB to 6GB on Ubuntu 14.04.
Thanks for instructions & discussion.
Funny thing, I had to reduce my swap file from 8G to 4G. Gobble up too much disk space.
No, you don't have to repeat these step if you already have swapfile in root directory.
Check swapfile
cd /
ls -a
Just follow these steps:
Make all swap off
sudo swapoff -a
Resize the swapfile
sudo dd if=/dev/zero of=/swapfile bs=1M count=1024
Make swapfile usable
sudo mkswap /swapfile
Make swapon again
sudo swapon /swapfile
Worked with me I increased my swap size from 1.5 GB to 7 GB. But when I restarted my computer it came back to 1.5 GB, I don't know why? could you please help.