[Beowulf] newbie

Greg Lindahl lindahl at pbm.com
Sat May 2 19:42:15 EDT 2009


> [Intel and Shanghai]
> > Is this deliberate?
> 
> In the sense that they have no desire to support
> competitors hardware, yes. Not really surprising,
> if AMD made compilers I doubt they'd try and do
> Intel specific optimisations either..

Actually, that's what a part of the AMD/Intel anti-trust lawsuit is
about. Back in the day of plug-compatible mainframes, IBM would have
been in deep anti-trust doodoo for intentionally reducing performance
on competing hardware -- and their mainframe architecture, just like
x86, had a wide variety of add-on features which could be tested for
individually, just like SSE / SSE2 / SSE3 / etc.

Instead of making compilers, AMD chose to suport PathScale (now
SiCortex), PGI, and gcc, all of which also have Intel-specific
optimizations.

As for the blog posting, you shouldn't draw general conclusions from a
single toy test-case. And I think you'll find all compilers will do a
much better job if they know at compile-time that it's x**(-2)... so
if that's your real app, don't code it like that toy.

-- greg



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