A script to start a Homebrew postgres in memory (needs lunchy to automatically stop the global postgres instance, gem install lunchy)

postgres-memory

#!/bin/bash
# get lunchy: gem install lunchy
lunchy stop postgres

# Run this script to enable the Ramdisk for Postgres
VolumeName="postgres-memory"

# Size in MB, make sure is not too low or not too high
SizeInMB=2048

NumSectors=$((2*1024*SizeInMB))

DeviceName=`hdid -nomount ram://$NumSectors`
VolumePath="/Volumes/$VolumeName"

echo $DeviceName

diskutil eraseVolume HFS+ $VolumeName $DeviceName

cp -R /usr/local/var/postgres $VolumePath/postgres
chown -R $USER:admin $VolumePath/postgres

/usr/local/bin/postgres -D $VolumePath/postgres

umount $VolumePath