摘要
应用高阶旋转交错网格的有限差分法,求解了基于一阶的速度-应力弹性波方程,推导了时间二阶精度空间2M阶精度的高阶有限差分离散格式.为了提高弹性波正演模拟效率,论文探讨了常规的CPU串行计算、基于GPU平台的节点并行计算、基于GPU平台的分量、节点同时并行的3种正演模拟计算模式,给出了不同算法的流程示意图.通过对比3种算法的耗时及后两种算法的加速比,可清晰判定,基于GPU平台的节点并行算法较CPU平台的串行算法有明显加速,最大加速比可达到60倍,而基于分量、节点同时并行算法的最大加速比最大可到180左右,加速效果更为明显.最后应用Marmousi模型的15000次时间步迭代的正演计算,基于分量、节点GPU并行算法大约是节点并行计算耗时的1/3,说明了该并行设计能有效提高弹性波正演模拟的效率,节约计算耗时.
By using the finite difference method of high order rotating staggered grid,the high order finite difference discretization scheme based on the first-order velocity-stress elastic wave equation was derived.In order to improve the simulation efficiency of elastic wave forward modeling,the paper discusses three kinds of forward modeling simulation modes,such as conventional CPU serial computing,node parallel computing based on GPU platform,and GPU-based parallel components.By comparing three kinds of algorithms of time-consuming and two algorithms of speed ratio,it can be clearly determined that the node parallel algorithm based on the GPU platform is significantly faster than the serial algorithm of the CPU platform,and the maximum acceleration ratio can reach 60 times,and the component is based on The maximum acceleration ratio of the node simultaneous parallel algorithm can be up to about 180,and the acceleration effect is more obvious.Finally,15000 times of time step iterative forward calculation of Marmousi model is applied.The component-based and node-based simultaneous GPU parallel algorithm is about 1/3 of the elapsed time by node-type parallel computing,which shows that the parallel design can effectively improve the efficiency of elastic wave forward simulation and save the computing time.
作者
赵明哲
杨军
张陆军
袁忠明
王向宇
王珣
曹岑
冯德山
ZHAO MingZhe;YANG Jun;ZHANG LuJun;YUAN ZhongMing;WANG XiangYu;WANG Xun;CAO Cen;FENG DeShan(School of Geosciences and InfoPhysics,Central South University,Changsha 410083,China;Guangzhou Municipal Engineering Design and Research Institute Co.,Ltd.,Guangzhou 510060,China;CCCC Third Highway Engineering Co.,Ltd.,Beijing 101300,China)
出处
《地球物理学进展》
CSCD
北大核心
2022年第4期1697-1703,共7页
Progress in Geophysics
基金
国家自然科学基金资助项目(41774132,41574116)资助。
关键词
旋转交错网格
高阶差分法
并行计算
正演模拟
弹性波
Rotating staggered grid
Higher-order difference
Parallel computing
Forward Simulation
Elastic wave modeling
