[Beowulf] itanium vs. x86-64

[Mark Hahn]

> Next caliper allows to get a lot of diagnostics from the cpu (also because 
> ia64 supports all that while x86-64 does not AFAICT) like number of bubbles 
> in the pipeline, L2-cache misses, clock-cycles per line of C-code etc.

these are just the performance-counting MSR's, which are available 
on Opterons as well as Xeons too.
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