John Hearns wrote:
A commercial compiler - Intel / Pathscale /Portland will always give
you better performance from an application.
The guys who work on those compilers care about optimization.
While I agree with this generality, generally. It is not always true
Specific software may actually run faster with GCC than with a
"optimized" compiler. We saw several instances of this on the Apple
cluster with GCC 4 vs. Absoft.
Also, a particular code may run much better with one "optimized"
compiler than another. I have some that require PGI to run at all. Some
that run faster with PGI. And, others run better with Intel tham PGI.
--
Mike Davis Technical Director
(804) 828-3885 Center for High Performance Computing
jmdav...@vcu.edu Virginia Commonwealth University
"Never tell people how to do things. Tell them what to do and they will surprise you
with their ingenuity." George S. Patton
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