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Polyhedron benchmark
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Michal Kvasnicka



Joined: 28 Apr 2010
Posts: 23

PostPosted: Sat Nov 27, 2010 10:23 am    Post subject: Polyhedron benchmark Reply with quote

The new updated version of well known Polyhedron fortran compilers benchmark was released few days ago.
See: http://www.polyhedron.com/compare0html
Frankly, as an PGI user , I am a bit surprised!?

Any comments from PGI guys?

Michal
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mkcolg



Joined: 30 Jun 2004
Posts: 5815
Location: The Portland Group Inc.

PostPosted: Mon Nov 29, 2010 1:28 pm    Post subject: Reply with quote

Hi Michal,

Thanks for the pointer. I took a look and found that most of the discrepancy between the results are due to the use of Auto-parallelization. They only added the optimization to the Absoft and Intel compilers leading to skewed results. Adding our auto-parallelization flag "-Mconcur=innermost,allcores" will match performance of Air, GAS_DYN, and RNFLOW. I'll contact the Polyhedron folks and see about updating the PGI flag set being used.

It does appear that Intel made a huge jump in performance with INDUCT which we'll need to take look at.

- Mat
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Michal Kvasnicka



Joined: 28 Apr 2010
Posts: 23

PostPosted: Tue Nov 30, 2010 12:42 am    Post subject: Reply with quote

The auto-paralleization flag was not used intentionaly:

"The settings used for the Intel and Absoft compilers enable autoparallelization. Autoparallelization settings are not used on any other compilers because we found that they produced no significant performance benefits on this benchmark set."
See: http://www.polyhedron.com/pb05-linux-f90bench_p40html

I am not able to understand this approach of Polyhedron guys!

Michal
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Michal Kvasnicka



Joined: 28 Apr 2010
Posts: 23

PostPosted: Sun Dec 26, 2010 2:49 am    Post subject: PGI 11.0 Reply with quote

Is new PGI compiler release v11.0 able to eliminate huge paerformance gap of INDUCT code?
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mkcolg



Joined: 30 Jun 2004
Posts: 5815
Location: The Portland Group Inc.

PostPosted: Tue Dec 28, 2010 1:39 pm    Post subject: Reply with quote

Sorry, No.

- Mat
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