Open problems in CEM: Porting an explicit time-domain volume-integral- equation solver on GPUs with OpenACC

Date

2014-01-01

Author

Ergül, Özgür Salih
Al-Jarro, Ahmed
Clo, Alain
Bagci, Hakan

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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Graphics processing units (GPUs) are gradually becoming mainstream in high-performance computing, as their capabilities for enhancing performance of a large spectrum of scientific applications to many fold when compared to multi-core CPUs have been clearly identified and proven. In this paper, implementation and performance-tuning details for porting an explicit marching-on-in-time (MOT)-based time-domain volume-integral-equation (TDVIE) solver onto GPUs are described in detail. To this end, a high-level approach, utilizing the OpenACC directive-based parallel programming model, is used to minimize two often-faced challenges in GPU programming: developer productivity and code portability. The MOT-TDVIE solver code, originally developed for CPUs, is annotated with compiler directives to port it to GPUs in a fashion similar to how OpenMP targets multi-core CPUs. In contrast to CUDA and OpenCL, where significant modifications to CPU-based codes are required, this high-level approach therefore requires minimal changes to the codes. In this work, we make use of two available OpenACC compilers, CAPS and PGI. Our experience reveals that different annotations of the code are required for each of the compilers, due to different interpretations of the fairly new standard by the compiler developers. Both versions of the OpenACC accelerated code achieved significant performance improvements, with up to 30× speedup against the sequential CPU code using recent hardware technology. Moreover, we demonstrated that the GPU-accelerated fully explicit MOT-TDVIE solver leveraged energy-consumption gains of the order of 3× against its CPU counterpart.

Subject Keywords

Electrical and Electronic Engineering, Condensed Matter Physics

URI

https://hdl.handle.net/11511/37685

Journal

IEEE Antennas and Propagation Magazine

DOI

https://doi.org/10.1109/map.2014.6837098

Collections

Department of Electrical and Electronics Engineering, Article

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Citation Formats

Ö. S. Ergül, A. Al-Jarro, A. Clo, and H. Bagci, “Open problems in CEM: Porting an explicit time-domain volume-integral- equation solver on GPUs with OpenACC,” IEEE Antennas and Propagation Magazine, pp. 265–277, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37685.