Object-Oriented OpenMP Programming with C++ and Fortran
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Object-Oriented OpenMP Programming with C++ and Fortran
Jun 16, 2009 - o Some Aspects of OpenMP o Implementation in C++ and FORTRAN o Comparison: C++ versus FORTRAN o Conclusion and Future Work.
Object-Oriented OpenMP Programming with C++ and FORTRAN Christian Terboven, Dieter an Mey, Paul Kapinos, Christopher Schleiden, Igor Merkulow {terboven, anmey, kapinos, schleiden, merkulow}@rz.rwth-aachen.de
Center for Computing and Communication RWTH Aachen University, Germany
June 16th, 2009 HPCS 2009, Kingston, ON, Canada
Object-Oriented OpenMP Programming
16.06.2009 – C. Terboven
Agenda o Motivation and Computational Task o Some Aspects of OpenMP o Implementation in C++ and FORTRAN o Comparison: C++ versus FORTRAN
o Conclusion and Future Work 2
Motivation
OpenMP
Implementation C++ & FORTRAN
Comparison
Conclusion
Object-Oriented OpenMP Programming
16.06.2009 – C. Terboven
Object-Oriented and Parallel Programming o Object-Oriented Programming is mainstream since the 90s, Parallel Programming is just about to enter mainstream. – Reasons for OO: Encapsulation and Modularity → Reusability
o Compute intense core of many PDE solvers consists of Krylov subspace methods. Variations exist among different programs and throughout the development process. o Parallelization is often decoupled from ongoing development.
3
→ Use of OO techniques to introduce and optimize parallelization → Use of OO techniques to investigate parallelization approaches → Use of OO techniques to hide complex architecture details from application / algorithm developer Motivation
OpenMP
Implementation C++ & FORTRAN
Comparison
Conclusion
Object-Oriented OpenMP Programming
16.06.2009 – C. Terboven
C++: Iteration Loop of CG-style solver MatrixCL A(rows, cols, nonzeros); Matrix data type VectorCL q(n), p(n), r(n); Vector data type […] for (int i = 1; i
