Embedded Files
Adding swap file
Adding swap file
Swap is an area on your hard drive that can store data when your RAM is full. First we need to check to see if a swap area is configured:
If you get the headers back only, you have no swap space:
sudo swapon -s
Now lets create a 4 gig swap:
Verify that is has been created and is the correct size
You should see something like this:
sudo fallocate -l 4G /swapfile
ls -lh /swapfile
Now change the folder permissions:
Set up swap
You will should see the output below.
sudo chmod 600 /swapfile
sudo mkswap /swapfile
Now enable swap
Lets check to see if we have swap space
We should get the following output:
sudo swapon /swapfile
sudo swapon -s
To make the changes permanent you need to update the fstab file
sudo echo '/swapfile none swap sw 0 0' >> /etc/fstab
Update swappiness
Update swappiness
Swappiness can be configured between 0 and 100. The nearer to 0 the more data will be put into the RAM rather than the swap.
To view the current swappiness:
To change the swapiness to 10:
This only takes effect on reboot, so also run this command to effect this change immediately
sudo sysctl vm.swappiness=10
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http://blog.chris-ritchie.com/2015/02/installing-wildfly-on-ubuntu-14.04-cloud-server.html
cat /proc/sys/vm/swappiness
sudo echo 'vm.swappiness=10' >> /etc/sysctl.conf
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