[Beowulf] Win64 Clusters!!!!!!!!!!!!

Jakob Oestergaard jakob at unthought.net
Thu Apr 12 03:37:51 EDT 2007


On Sun, Apr 08, 2007 at 07:30:41PM +0200, Toon Moene wrote:
> Jon Forrest wrote:
> 
> >One thing I've noticed about 64-bit computing in general
> >is that it's being oversold. The **only** reason
> >for running in 64-bit mode is if you need the additional
> >address space.

For AMD64 (including EM64T) you get more registers when putting the CPU
in 64-bit mode. A *lot* more registers. That really matters on an
architecture where you historically had clost to zero general purpose
registers.

This is unlike UltraSPARC, where your point is pretty much correct.

-- 

 / jakob

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