> Plan 9 first edition came out in 1992, at a time when multicore didn't exist, and multicore was released with IBM's Power 4 in 2001. 

possibly true but multi-cpu boxes where becoming quite popular in the late 1980s and these have very similar kernel design challenges to multicore architectures.

one of the 1st edition’s target hosts where sgi numa machines (challenge 2s i think)

what i am saying is the plan9 kernel supported multiple processors from the very early days.

i wonder if the lost vax kernel supported multiple cpu's (or maybe is was kenfs only?).

Steve


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