Why is SMT (multicore) support hard for Amiga OS?

[Karlos]

I should point out that I'm in no way advocating a WOS like approach, which given my numerous references to it in this thread, people might think. The only reason I mention it at all is that it serves as a demonstration that general multiprocessing (ie two processors that can run code simultaneously, rather than one processor and a custom chip or FPU etc) already has a precedent of sorts.

True SMP is a different beast all together, of course.

[Karlos]

The PPC isn't running AmigaOS though. The hardware isn't the issue.
 
If you wanted to run two 68000's, then ExecBase would have to change.

Not in a WOS style implementation, where tasks are "transferred" cooperatively from one CPU to another, it wouldn't (as I said earlier, this isn't a serious option for many good reasons). In a true SMP implementation, of course it would.