Ubuntu Add Virtual Ram

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free -m
mkdir -p /var/swapmemory
cd /var/swapmemory
#Here, 1M * 2000 ~= 2GB of swap memory
dd if=/dev/zero of=swapfile bs=1M count=2000
mkswap swapfile
swapon swapfile
chmod 600 swapfile
echo "/var/swapmemory/swapfile none swap sw 0 0" >> /etc/fstab
#cat /proc/meminfo
free -m