OALib Journal期刊
ISSN: 2333-9721
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基于cpu+gpu联合计算真地表叠前时间偏移实用化研究
Keywords: 叠前时间偏移,起伏地表,高性能计算,并行效率,gpu移植,cuda优化
Abstract:
?为了提高起伏地表条件下的基尔霍夫叠前时间偏移算法的计算效率,针对cpu+gpu异构计算平台开展了算法移植与优化研究。首先分析了起伏地表条件下提高偏移成像精度的反假频、弯曲射线旅行时计算以及真地表旅行时校正的处理方法,然后在对算法的并行计算特征进行分析的基础上,针对cpu+gpu异构平台的算法移植进行了多级并行联合计算架构的设计,通过炮检距域的多进程数据域并行、地震数据i/o与偏移计算的异步并行、基于cuda的超大规模线程成像域并行以及联合cpu计算的多线程成像域并行技术对算法进行了移植及优化。利用大规模测试数据集进行了计算效率测试,测试结果验证了多级并行联合计算架构以及分别针对cpu和gpu平台的算法优化技术能够极大地提高偏移处理效率。
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