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Performance Evaluation of Compiler-Assisted OpenMP Codes on Various HPC Systems

In: Sustained Simulation Performance 2015

Author

Listed:
  • Kazuhiko Komatsu

    (Tohoku University/JST CREST, Cyberscience Center)

  • Ryusuke Egawa

    (Tohoku University/JST CREST, Cyberscience Center)

  • Hiroyuki Takizawa

    (Tohoku University/JST CREST, Graduate School of Information Sciences)

  • Hiroaki Kobayashi

    (Tohoku University, Cyberscience Center)

Abstract

As automatic parallelization functions are different among compilers, a serial code is often modified so that a particular target compiler can easily understand its code structure and data dependency, resulting in effective automatic optimizations. However, these code modifications might not be effective for a different compiler because the different compiler cannot always parallelize the modified code. In this paper, in order to achieve effective parallelization on various HPC systems, compiler messages obtained from various compilers on different HPC systems are utilized for the OpenMP parallelization. Because the message about one system may be useful to identify key loop nests even for other systems, performance portable OpenMP parallelization can be achieved. This paper evaluates the performance of the compiler-assisted OpenMP codes using compiler messages from various compilers. The evaluation results clarified that, when a code is modified for its target compiler, the compiler message given by the target compiler is the most helpful to achieve appropriate OpenMP parallelization.

Suggested Citation

  • Kazuhiko Komatsu & Ryusuke Egawa & Hiroyuki Takizawa & Hiroaki Kobayashi, 2015. "Performance Evaluation of Compiler-Assisted OpenMP Codes on Various HPC Systems," Springer Books, in: Michael M. Resch & Wolfgang Bez & Erich Focht & Hiroaki Kobayashi & Jiaxing Qi & Sabine Roller (ed.), Sustained Simulation Performance 2015, pages 147-157, Springer.
    • Handle: RePEc:spr:sprchp:978-3-319-20340-9_12
    DOI: 10.1007/978-3-319-20340-9_12
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