[Beowulf] itanium vs. x86-64

Toon Knapen toon.knapen at gmail.com
Tue Feb 10 14:55:15 EST 2009


kyron at neuralbs.com wrote:
>>> 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.
> 
> Even back to the PIII processors (and more?). Check out PAPI
> (http://icl.cs.utk.edu/papi/) for more details but, as an example, here is
> the output from an old cluster node:
> 


Oops. Well actually great to hear. Which profilers can benefit from all 
this info?

toon
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