Lessons learned in Using Intel Xeon Phi Coprocessors in Engr Applications
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"An absolute beginner meets Intel Xeon Phi" with E4
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Lessons learned in Using Intel Xeon Phi Coprocessors in Engr Applications
- 1. Lessons learned in using Intel® Xeon Phi™ with open-source engineering applications
- 2. Intel® Xeon Phi™ and me or an absolute beginner meets Intel Phi
- 3. Intro (very short) Goals, options and tools My learning curve Open Source CFD applications (brief and incomplete overview) What I have done What I have achieved (so far) Lesson learned Agenda
- 4. •CFD requires massive amount of FLOPS •As of today (yesterday??), FLOPS=cores •Accelerators have changed the landscape (and are here to stay) •A growing number of reliable Open Source (i.e. non licensed) applications are available (e.g. OpenFOAM, SPHYSICS) •A growing number of ISVs (i.e. licensed) packages support accelerators (e.g. ANSYS V14.5) •How easy is squeezing performance out of Intel® Xeon Phi™ for an absolute beginner??? Intro
- 5. How different are the accelerators architectures? How adequate is Intel Phi for my current requirements? How feasible is the migration path? How can my Intel Phi- ported applications applications be modularized?? What is the impact of introducing Intel Phi on the Corporate Reference Architecture? How compliant is Intel Phi to the Corporate Reference Architecture? Which framework / platform / technology fits my needs best? How can my Intel® Xeon Phi™-ported applications applications be modularized?? How adequate is Intel Phi as a basis for my future software needs? How can I improve performance, reuse, maintainability, efficiency? Questions
- 6. How to achieve the goal? How to achieve the goal
- 7. The goal: What tool will have the best fit? Multiple tools? One item vs many? The solution: Goals vs Tools
- 8. Usually, taking the right decision upfront is highly recommended Reasonable advice
- 9. My learning curve/1 Please note the coffee cups….p Intel® Xeon Phi™ Coprocessor System Software Developers Guide Revision: 2.03 Last Modified: November 8, 2012 IBL Doc ID: 488596 Friends (and I have lost a couple of them in the process...) Colleagues (and some of them keep very clear of me now...) Blogs 201 pages
- 10. Bad times Good times Long hours and nights My learning curve/2
- 11. Some tests backfired My learning curve/3 Some tests worked just fine
- 12. /var/log/micras.log The codes OpenFOAM - The open source CFD toolbox •www.openfoam.com •De-facto standard for open source CFD applications •Wide and growing range of models •Unzip, compile and run on nodes •Version 2.2.0 (06/03/13) SPHysics - SPH Free-surface Flow Solver •wiki.manchester.ac.uk/sphysics/index.php/SPHYSICS_Home_Page •Open-Source Smoothed Particle Hydrodynamics code •v2.2.1 Serial Code (January 2011) •v2.0 Parallel Code (January 2011) •v2.0 DualSPHysics CPU-GPU (March 2012)
- 13. /var/log/micras.log The system •MOBO (Simone….) •16 cores •2.1GHz •256 Gbytes •Mpi •Icc,ifort 9.000
- 14. Compile-time options ONLY aren’t going to squeeze the LAST GFLOPS out of your Re-coding the application is mandatoryfor achieving top performance
- 15. Don’t try to control the waves. This almost never works. Learn to surf....
- 17. Fabrizio Magugliani E4 computer Engineering Fabrizio.magugliani@e4computer.com