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I just use a swap file.

This is what I do to alter the size

#Disable swap
sudo swapoff /swapfile
#Increase the file swap size
#This is for 8gb, or 8192mb, change the 8192 to whatever best suits your purposes
sudo dd if=/dev/zero of=/swapfile bs=1M count=8192 oflag=append conv=notrunc
#Make the new file a swap file
sudo mkswap /swapfile
#Re-enable the swap
sudo swapon /swapfile
#Check to make sure it worked (Will be under "Swap total")
cat /proc/meminfo

I use Kubuntu (the horror!) so my commands are Debian-oriented. You may need to do it differently if you use Arch or something. Also mind that the bit oflag=append conv=notrunc appends to the original swapfile, I hardly know how to use dd, so I'm not sure of the flags for not appending.