지구물리와물리탐사 (Geophysics and Geophysical Exploration)

  • 제20권3호
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  • Pages.129-136
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  • 2017
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  • 1229-1064(pISSN)
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  • 2384-051X(eISSN)
한국지구물리·물리탐사학회 (Korean Society of Earth and Exploration Geophysicists)
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제온 파이 보조 프로세서를 이용한 3차원 주파수 영역 음향파 파동 전파 모델링 병렬화

Parallelizing 3D Frequency-domain Acoustic Wave Propagation Modeling using a Xeon Phi Coprocessor

  • 류동현 (부경대학교 에너지자원공학과) ;
  • 조상훈 (부경대학교 에너지자원공학과) ;
  • 하완수 (부경대학교 에너지자원공학과)
  • Ryu, Donghyun (Department of Energy Resources Engineering, Pukyong National University) ;
  • Jo, Sang Hoon (Department of Energy Resources Engineering, Pukyong National University) ;
  • Ha, Wansoo (Department of Energy Resources Engineering, Pukyong National University)
  • 투고 : 2017.04.10
  • 심사 : 2017.07.19
  • 발행 : 2017.08.31
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초록

파형 역산 또는 역시간 구조 보정과 같은 3차원 탄성파 자료 처리를 위해서는 3차원 파동 전파 모델링과 그에 따른 대량의 수치 계산이 필요하다. 본 연구에서는 3차원 주파수 영역 파동 전파 모델링을 이용해 제온 파이 가속기와 서버용 고성능 CPU의 성능 및 정확성을 비교하였다. 시간 영역 유한 차분법 알고리즘에 제온 파이의 특징을 고려하여 OpenMP 병렬 프로그래밍을 적용하였다. 주파수 영역 파동장을 얻기 위해서는 시간 영역 모델링과 동시에 푸리에 변환을 수행하였다. 3차원 SEG/EAGE 암염돔 속도 모델을 사용하여 주파수 영역 파동장을 생성한 결과, 제온 파이를 이용해 정확한 주파수 영역 파동장을 CPU 대비 1.44배 빠르게 얻을 수 있었다.

3D seismic data processing methods such as full waveform inversion or reverse-time migration require 3D wave propagation modeling and heavy calculations. We compared efficiency and accuracy of a Xeon Phi coprocessor to those of a high-end server CPU using 3D frequency-domain wave propagation modeling. We adopted the OpenMP parallel programming to the time-domain finite difference algorithm by considering the characteristics of the Xeon Phi coprocessors. We applied the Fourier transform using a running-integration to obtain the frequency-domain wavefield. A numerical test on frequency-domain wavefield modeling was performed using the 3D SEG/EAGE salt velocity model. Consequently, we could obtain an accurate frequency-domain wavefield and attain a 1.44x speedup using the Xeon Phi coprocessor compared to the CPU.

키워드

참고문헌

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