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Swap can be utilised by the system to free up space in RAM. For most use cases it is recommend to create a swapfile that is one and a half times the size of your RAM.
To create a swapfile of 8 GB use:
# dd if=/dev/zero of=/swapfile bs=8M count=1024 status=progress
To create a different size of swapfile, change the count=
amount to a desirable size.
Then to actually add the swap space to your system issue these commands:
# chmod 600 /swapfile
# mkswap /swapfile
# swapon /swapfile
To mount the swap to the system at boot, add the swapfile to your /etc/fstab
:
/swapfile none swap defaults 0 0
And do not forget to reconfigure the kernel after updating/etc/fstab
:
# xbps-reconfigure -f linux<version>