Nested parallelization with OpenMP

Authors:
Dieter An Mey;Samuel Sarholz;Christian Terboven
Affiliations:
Center for Computing and Communication, RWTH Aachen University, Aachen, Germany;Center for Computing and Communication, RWTH Aachen University, Aachen, Germany;Center for Computing and Communication, RWTH Aachen University, Aachen, Germany
Venue:
International Journal of Parallel Programming
Year:
2007

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Abstract

OpenMP is widely accepted as a de facto standard for shared memory parallel programming in Fortran, C and C++. Nested parallelization has been included in the first OpenMP specification, but it took a few years until the first commercially available compilers supported this optional part of the specification. We employed nested parallelization using OpenMP in three production codes: a C++ code for content-based image retrieval, a C++ code for the computation of critical points in multi-block CFD datasets, and a multi-block Navier-Stokes solver written in Fortran90. In this paper we discuss the opportunities as well as the deficiencies of the nested parallelization support in OpenMP.