Comment by Moru
This seems to be very forgotten tech. First time I used that was to load NetHack to ram instead of the slow diskette on my Atari. Now I still use it as webcache for work to not bother the database with so many requests.
When I set up the server, the ramdisk didn't have a way of shrinking when space wasn't needed so had to make sure it doesn't eat up all memory when growing unlimited. I bet it's smarter nowadays.
Not forgotten at all -- in fact, if your system has has a /tmp directory, it is almost certainly a RAMdisk.