swap and tempfs

[Adam Myrow]

Actually, you can make tempfs use more than half your memory by passing
the right options in /etc/fstab.  You could also make it use less than
half of your memory this way.  For example, if you want to have /tmp
forced to 32MB regardless of how much memory you have, the following line
would do that.

/dev/shm /tmp tmpfs   size=32m 0 0

Of course, the danger is, if you specify more memory than your total RAM
plus swap, you risk crashing your system.  That's why the default is half
of your physical RAM.  It is a safety precaution.