Make RAM disk on Ubuntu
sudo mkdir -p /media/source
sudo mount -t tmpfs -o size=2048M tmpfs /media/source/
df -h /media/source/
Filesystem Size Used Avail Use% Mounted on
tmpfs 2.0G 0 2.0G 0% /media/source
How fast
/dev/sdb1 is a SSD
$ sudo hdparm -Tt /dev/sdb1
/dev/sdb1:
Timing cached reads: 12562 MB in 2.00 seconds = 6283.40 MB/sec
Timing buffered disk reads: 712 MB in 3.00 seconds = 237.18 MB/sec
$ sudo hdparm -Tt /dev/ram0
/dev/ram0:
Timing cached reads: 16236 MB in 2.00 seconds = 8123.15 MB/sec
Timing buffered disk reads: 64 MB in 0.02 seconds = 3537.67 MB/sec
Dynamically increase its size
/bin/mount -t tmpfs -o size=4G,remount tmpfs /tmp