Setup something like http://ubuntuforums.org/showthread.php?t=182764
and set your datastore path on to the ramdisk with :

--datastore_path=PATH      Path to use for storing Datastore file stub
data. (Default /tmp/dev_appserver.datastore)


*** speed tests ***

Regular disk:

jmore...@mint ~/Tmp $ sudo hdparm -Tt /dev/sda4
/dev/sda4:
 Timing cached reads:   3576 MB in  2.00 seconds = 1791.11 MB/sec
 Timing buffered disk reads:  112 MB in  3.01 seconds =  37.23 MB/sec


Ram disk disk:

jmore...@mint ~/Tmp $ sudo hdparm -Tt /dev/ram0
/dev/ram0:
 Timing cached reads:   4114 MB in  2.00 seconds = 2061.44 MB/sec
 Timing buffered disk reads:   64 MB in  0.14 seconds = 446.65 MB/sec


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