[Beowulf] newbie

Joe Landman landman at scalableinformatics.com
Fri May 1 20:37:07 EDT 2009


Gus Correa wrote:

> On Opteron Shanghai the Intel 10.1 compilers seem to reject
> any architecture-dependent optimization flag above -xW (SSE and SSE2),
> although the processor has SSE3, etc, and would qualify for
> higher levels of optimization, or not?
> Is this deliberate?

Intel builds compilers that generate reasonable performing code on Intel 
processors.  I think they also generate (or at least they did in the 
past) a slower path for more generic processors.  AMDs are in this mix.

Our experience with recent gcc suggests it is pretty good relative to 
icc/pgcc.  Gfortran isn't bad, but we find it easier to build F90 code 
with ifort/pgf90 than gfortran.  I haven't used g95 much, don't have as 
much of an opinion as to ease of portability.


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Joseph Landman, Ph.D
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Scalable Informatics LLC,
email: landman at scalableinformatics.com
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