PGI User Forum

Michal Kvasnicka · Joined: 28 Apr 2010 Posts: 23

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

mkcolg · Posted: Mon Nov 29, 2010 1:28 pm Post subject:

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

Michal Kvasnicka · Joined: 28 Apr 2010 Posts: 23

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

Michal Kvasnicka · Joined: 28 Apr 2010 Posts: 23

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

mkcolg · Posted: Tue Dec 28, 2010 1:39 pm Post subject:

Sorry, No.

- Mat