OOOE and energy efficiency

Article: New Itanium Microarchitecture at ISSCC 2011
By: ajensen (.delete@this..), November 24, 2010 1:58 am
Room: Moderated Discussions
David Kanter (dkanter@realworldtech.com) on 11/23/10 wrote:
>I'm not convinced that the power cost is that high or that it necessarily scales
>directly with area (i.e. I think it costs more area than power if done right).

If OOOE was the best way to get throughput/watt then all GPU designs would have been OOOE. It's that simple really. Tomasulo OOOE with MT could be better than basic in-order with MT, when considering Amdahl's law, for an average workload for some ISA. Probably not for IA64.

As for most problems the optimal solution is never at the extremes, but somewhere in between. Tomasulo OOOE has way too many degrees of freedom to make any sense IMO, at least for IA64, it is more likely to be the optimal solution for poorly threaded or inherently serial x86 and RISC code.

I'm sure if you can dig up the most difficult workload in the world with low ILP, random branches, cache misses everywhere and high dependence on some quirky not-hard-coded-in-ia64 instructions latency, like the square root or something, then IA64 would absolutely suck at it no mater how you do the uarch. And OOOE x86 or RISC would excel at it. Big deal.
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ISSCC Poulson Preview OnlineDavid Kanter2010/11/17 03:40 AM
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        ISSCC Poulson Preview Online - OoO not unlikely?Linus Torvalds2010/11/17 08:03 PM
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        ISSCC Poulson Preview Online - OoO not unlikely?someone2010/11/17 02:59 PM
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                ISSCC Poulson Preview Online - OoO not unlikely?anon2010/11/18 01:14 AM
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                                      single-system single-location != RASdc2010/11/25 12:06 PM
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