[xigency]

"Eh, I don't think I want a common programming model across CPUs and GPUs. They are fundamentally different machines, and I don't think it makes sense to try to lump them together."

Well, except for APU's, which I think is an unstated target for this discussion. Or on-board graphics chips.

In these cases, there is almost certainly extra work being done, regardless of your programming philosophy.

[robbies]

I'd actually argue that not that much changes, except APUs mean you don't have to worry about different memory pools, and moving stuff across the bus. That's a whole other problem, as far as streaming data management. If we're just talking about GPU programming, in my experience, even APUs still feel like two separate processors instead of some...combined thing.