Employing nested OpenMP for the parallelization of multi-zone computational fluid dynamics applications. (English) Zbl 1101.68455

Ayguade, Eduard; Gonzalez, Marc; Martorell, Xavier; Jost, Gabriele

J. Parallel Distrib. Comput. 66, No. 5, 686-697 (2006).

Summary: We describe the parallelization of the multi-zone code versions of the NAS Parallel Benchmarks employing multi-level OpenMP parallelism. For our study, we use the NanosCompiler that supports nesting of OpenMP directives and provides clauses to control the grouping of threads, load balancing, and synchronization. We report the benchmark results, compare the timings with those of different hybrid parallelization paradigms (MPI+OpenMP and MLP) and discuss OpenMP implementation issues that affect the performance of multi-level parallel applications.

MSC:

68N19

Other programming paradigms (object-oriented, sequential, concurrent, automatic, etc.)

Keywords:

OpenMP; parallel programming models; nested parallelism; NAS benchmarks

Software:

OVERFLOW-MLP