Bit late to the game here, but here is an early implementation I did back in 1993, the running process was saved as a new executable which you could just fire up again. Yes, I had seen inside the Cray implementation, and trust me, this bears no resemblance to it, and you would run screaming for the hills if you saw it! http://ftp.metalab.unc.edu/pub/historic-linux/ftp-archive...
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