Err..
(1) Machines crash, so checkpoint for a long running process is sometimes a
good idea
(2) Sometimes the power goes out or people need to twiddle with stuff
(3) You need to play Quake2 and want to restart the process(es) later
(4) You want to add more disk/ram half way through doing something kewl
Note, all of these also apply to single processor configurations.
-Chris
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