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simo: Is that old McCauley or new Drag McCauly? ;)

It's not about instructions, it's about where a process's state is held. A process has to be explicity loaded into registers, in bigger OSs page tables for virtual memory have to be set up, and so on - giving that (virtual) CPU the task to run. The operating system is the only entity that knows where this active state is, so only it can decide.


But the extra processor cards on old macs were largely unused, as they had to be explicity programmed for, and having the application manage the sharing is not teh best solution (it has to save off the processor incase other apps want it, or just hold exclusive use of it). Anyway, history shows that such cards were largely under utilised. It's only when multiprocessor support comes for free through OS thread management that multiprocessor macs became properly utilised.

All repeat after me: this requires OS support, this requires OS support, this... ;)

 is a RISC OS UserDougal on 22/10/03 9:56AM
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