See scaler.com article

ramfs

• Doesn't have a limit

tmpfs

• Can have a limit

sudo mount -t tmpfs -o size=2048M tmpfs /media/ramdisk

mkram

A simple script to create a ramdisk via tmpfs, and change ownership. Here mine is shorthand for sudo chown --reference=$HOME

#!/bin/bash
# make ramdisk
SIZE="${2-2048M}"
P="${1-$HOME/ram}"
sudo mount -t tmpfs -o size="${SIZE}" tmpfs "$P" && mine "$P"