ram disk for mac

mkramdisk.sh

#!/bin/sh
# 
# mkramdisk.sh : prepare ramdisk for mac
# 
# install:
# 1. modify variables (caches, mb) as your like, in this script.
# 
# 2. register to startup:
#   1. open "Ligon"
#   2. New to "Users Daemons"
#   3. Label: "mkramdisk"
#   4. ProgramArguments:"/PATH/TO/mkramdisk.sh"
#   5. RunAtLoad: check
#   6. Save & Load: push
#

# list for app caches from /Users/user/Library/Caches
caches='
  com.apple.Safari
  Google
  QCCompositionRepository-com.apple.iTunes.cache
  com.apple.iTunes
  com.apple.appstore
'

mb=2048       # size (MB)
mountpoint=/Volumes/.RamDisk
dir=cache

# prepare ramdisk
sect=`expr $mb \* 1024 \* 1024 \/ 512`
mydev=`hdid -nomount ram://$sect`

mask=`umask`
umask 000

/sbin/newfs_hfs $mydev
mkdir $mountpoint
/sbin/mount -t hfs $mydev $mountpoint
#/usr/sbin/diskutil renameVolume $mydev '.RamDisk' # <-- FIXME: why doesn't work

# dig directory
mkdir -p $mountpoint/$dir; cd $mountpoint/$dir
for d in $caches; do
  mkdir $d
done

umask $mask