[Beowulf] Intel 64bit (emt) Fortran code and AMD Opteron

Mark Hahn hahn at physics.mcmaster.ca
Fri Oct 29 20:36:37 EDT 2004


> > does anybody here have positive or negative experiences with using the
> > Intel EMT-64 Fortran compiler on AMD Opteron systems? 
> 
> Is it even going to work until the Opteron supports SSE3?

what SSE3 adds over SSE2 is remarkably minor.

> I suspect if you don't vectorize, or only build 32-bit apps
> you will be ok.  However, for most applications the vectorization
> is going to give you the big win.

the big win is getting away from the x87 FP stack.  vectorization
is a wonderful thing, but practically any FP code will see a nice speedup
with purely scalar SSE usage (such as you'd get with current gcc.)

regards, mark hahn.

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