how to change swap size
# Turn swap off
# This moves stuff in swap to the main memory and might take several minutes
sudo swapoff -a
# Create an empty swapfile
# Note that "1G" is basically just the unit and count is an integer.
# Together, they define the size. In this case 8GB.
sudo dd if=/dev/zero of=/swapfile bs=1G count=8
# Set the correct permissions
sudo chmod 0600 /swapfile
sudo mkswap /swapfile # Set up a Linux swap area
sudo swapon /swapfile # Turn the swap on
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