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Create a RAM disk for using with XCode, with Umount disks method
#!/bin/sh
# Create a RAM disk with same perms as mountpoint
# Script based on http://itux.idev.pro/2012/04/iservice-speed-up-your-xcode-%D0%BD%D0%B5%D0%BA%D0%BE%D1%82%D0%BE%D1%80%D1%8B%D0%B5-%D1%81%D0%BF%D0%BE%D1%81%D0%BE%D0%B1%D1%8B/ with some additions
# Usage: sudo ./xcode_ramdisk.sh start
USERNAME=$(logname)
TMP_DIR="/private/tmp"
RUN_DIR="/var/run"
USER_CACHES_DIR="/Users/$USERNAME/Library/Caches"
DEV_CACHES_DIR="/Users/$USERNAME/Library/Developer/Xcode/DerivedData"
DEV_IPHONE_DIR="/Users/$USERNAME/Library/Application Support/iPhone Simulator"
SYS_CACHES_DIR="/Library/Caches" # this must laster than USER_CACHES_DIR...
RAMDisk() {
mntpt="$1"
rdsize=$(($2*1024*1024/512))
# Create the RAM disk.
dev=`hdik -drivekey system-image=yes -nomount ram://$rdsize`
# Successfull creation...
if [ $? -eq 0 ] ; then
# Create HFS on the RAM volume.
newfs_hfs $dev
# Store permissions from old mount point.
eval `/usr/bin/stat -s "$mntpt"`
# Mount the RAM disk to the target mount point.
mount -t hfs -o union -o nobrowse -o nodev -o noatime $dev "$mntpt"
# Restore permissions like they were on old volume.
chown $st_uid:$st_gid "$mntpt"
chmod $st_mode "$mntpt"
echo "Creating RamFS for $mntpt $rdsize $dev"
fi
}
UmountDisk() {
mntpt="$1"
dev=`mount | grep "$mntpt" | grep hfs | cut -f 1 -d ' '`
umount -f "$mntpt"
hdiutil detach "$dev"
echo "Umount RamFS for $mntpt $dev"
echo ""
}
# Test for arguments.
if [ -z $1 ]; then
echo "Usage: $0 [start|stop|restart] "
exit 1
fi
# Source the common setup functions for startup scripts
test -r /etc/rc.common || exit 1
. /etc/rc.common
StartService () {
ConsoleMessage "Starting RamFS disks..."
RAMDisk "$TMP_DIR" 128
RAMDisk "$RUN_DIR" 64
RAMDisk "$SYS_CACHES_DIR" 64
RAMDisk "$USER_CACHES_DIR" 1024
RAMDisk "$DEV_CACHES_DIR" 1024
RAMDisk "$DEV_IPHONE_DIR" 1024
#RAMDisk /var/db 1024
#mkdir -m 1777 /var/db/mds
}
StopService () {
ConsoleMessage "Stopping RamFS disks..."
UmountDisk "$TMP_DIR"
UmountDisk "$RUN_DIR"
UmountDisk "$SYS_CACHES_DIR"
UmountDisk "$USER_CACHES_DIR"
UmountDisk "$DEV_CACHES_DIR"
UmountDisk "$DEV_IPHONE_DIR"
# diskutil unmount /private/tmp /private/var/run
# diskutil unmount /private/var/run
}
RestartService () {
ConsoleMessage "Restarting RamFS disks..."
StopService
StartService
}
RunService "$1"
@derjohng

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commented Apr 7, 2015

complete the StopService() and RestartService().

@delewis2015

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commented Jan 29, 2016

I seem to be experiencing a bit of a leak with SYS_CACHES. It creates ok, but doesn't remove, because grep returns two paths which detach reasonably claims don't exist. Restarting then causes an increasing number of volumes to be created

@aazwar

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commented Apr 3, 2016

If the folder is not blank, it will not mount. Here I modify to persist the Ramdisk content:
https://gist.github.com/aazwar/7baeb7e0ca4ca259e416a735c87eb918

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