run 'make check' twice as fast with tmpfs

Hi

Running 'make check' is tedious: lots of disk activity and very little
CPU. Not really surprising as this is a version control system and
disk activity is what it does.

However, if you have lots of RAM you can use tmpfs!

$ cd <path to working copy>
$ tar cf tests.tar subversion/tests
$ su root
# mount -t tmpfs tmpfs <path to working copy>/subversion/tests
# exit
$ tar xf tests.tar
$ make check

On my box, which has reiserfs on RAID0 and linux kernel 2.4.16, this
causes 'make check' to run twice as fast. The tmpfs filesystem uses
approx. 150MB.

*WARNING:* if you edit the test code on the tmpfs make sure that any
changes you make are copied out of the subversion/tests directory onto
a disk base file system before unmounting the tmpfs. I will *not* come
round and retrieve your changes from the aether if you forget!

-- 
Philip
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