I might do some reading, to see what the current thinking is on EPIC - that's the architectural idea behind what became Itanium. I did find this:


I'm assuming I'll find that the current thinking is that EPIC was a mis-step. But who knows. Certainly Itanium are enormous chips: there's the question of performance, but also price, and power. And the question of verification - complex designs are difficult to get right, which makes them expensive to develop, or late, or buggy, or some combination.

For what it's worth, I think this quote that BigEd provided sums up the problem very well. In my opinion, the issue of effective utilization of the pipelines of modern super-scalar processors is not going to be easily solved. Much of the SW targeting these processor architectures is written in programming languages that do not provide a framework for the development of algorithms with a parallel execution flavor. In my personal experience, I first design/plan algorithms in a sequential fashion, and only after the algorithm and its program is working correctly, do I look to see if I can re-write it as a parallel algorithm. In many cases, I find that temporal data dependencies, programming language limitations, etc. would result in an parallel version being more complicated than necessary. In addition, the sequential algorithm is more than fast enough for my needs, so any further effort on my part in eking out additional performance is not really worth the effort.

Again, FWIW, I think a heterogeneous processor like the CDC 6600 and CDC 7600 with their multiprocessor high-performance mainframe CPUs and low performance Peripheral Processors (PPs) is a better match to the modern processing problem. In other words, one or two multi-issue, super-scalar, out-of-order (OOO) processor cores matched with several single issue, barrel processors sharing the same instruction set on the same die would be a much better general purpose solution. Far more independent threads of execution (processes/tasks) could be supported by such a beast. I suspect that such a beast would also provide better performance for all of those low priority, I/O bound tasks that seemingly always cause my media player to annoyingly skip.

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Michael A.

Oops, meant to link to the source of that: http://web.cecs.pdx.edu/~idr/publications/epic.html