If you are running low on RAM on your system, you might want to consider adding some swap space. The following will allocate and assign a 2GB swap space.

sudo fallocate -l 2G /swapfile
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile
sudo swapon --show

It is possible to assign a second swap space. Just repeat the above commands but replace /swapfile with another name, eg. swapfile2

Removing swap space

sudo swapoff /swapfile
sudo rm /swapfile

To make permanent

Add the following line to /etc/fstab

/swapfile swap swap defaults 0 0