AROS SMP Research: Technical Discussion

[minator]

It's interesting that this is being tried but I suspect it will never get past the experimental phase.

Even if it can be made to work, it's going to serialise the CPUs so much that that's no point having multiple CPUs.

It might be possible to show a nice speedup on some long running highly parallelisable benchmark but that's it.  In any real system apps will be constantly stalling the system and you don't need to be Gene Amdahl to know what the result will be.

[minator]

For completely linear processing, a single core scalar processor is most efficient. Single core processors are generally more powerful than a single core in a processors with SMP that has the same resources.

Likewise, a a scalar processor is generally going to be faster than a superscalar or OoO processor with all dependent code and the same resources.

For that to be true every single instruction would have to depend on the previous instruction.
This is pretty much never the case so the OoO processor will win.

There is hardware overhead in parallel processing and that's not even counting the software overhead.

Yes.