Create a RAM Drive in OS X

ramdisk.sh

#!/bin/bash

# Halt on all errors
set -e

# Check for size parameter and display usage if needed
if [ "$1" == "" ]; then
  printf "\nRamdisk - creates a RAM disk (what else?)\n\n"
  printf "Usage: ramdisk <size in MB>\n\n"
  exit 1
fi

# Drive size = size in MB * block size
SIZE=$(expr $1 \* 2048)

# Do it!
diskutil erasevolume HFS+ "Ramdisk" `hdiutil attach -nomount ram://$SIZE`

ramdisk_login.sh

#!/bin/bash

# You can use ramdisks for all sorts of things. I personally use it to speed up Ableton Live by
# storing the decoding cache on it. This only works if the disk is always there, which means it needs
# to be re-created every time the computer boots.
#
# To do that, you'll need a second script. This is the one I use.


# Creates a 2Gb ramdisk
/path/to/ramdisk 2048

# Creates the AbletonCache folder (pre-configured in the "Files" pane on Ableton Live preferences)
mkdir -p /Volumes/Ramdisk/AbletonCache


# To make it run on login, use the following command on the terminal (remember to edit the path):
#
# sudo defaults write com.apple.loginwindow LoginHook /path/to/ramdisk_login.sh