基于Intel至强众核加速积分法叠前时间偏移技术的实现

摘要

为进一步提升积分法叠前时间偏移（PSTM）程序的运行效率，利用 Intel 至强众核（MIC）技术，将该程序移植到至强众核平台上，以实现对该程序的加速。GeoEast 系统下的PSTM模块CPU版本采用MPI＋PThread 多线程方式实现程序运行的并行计算。在 CPU＋MIC协同计算方式下，继承上述的并行方式，同时，成像空间数据在节点间和节点内的CPU和MIC之间采用交替分割方式，并优化CPU与MIC之间的数据异步流水线式传输。通过CPU＋MIC协同计算优化，PSTM模块运行效率相比 CPU 版本提升3．8倍，取得了预期的效果，也验证了CPU＋MIC协同计算加速PSTM的可行性。%In order to improve Kirchhoff pre-stack time migration process efficiency,the program is ported onto Intel Xe-on multiple integrated core(MIC)platform.The PSTM in GeoEast system uses MPI+Pthread method in parallel processing. In CPU+MIC cooperative computing,in addition to MPI+PThread,the migration imaging data are put on each node by turn, and also on CPU and MIC by turn.In addition,using asynchronous data transfer between CPU and MIC.Through the CPU+MIC cooperative computing optimization,compared with CPU version,the MIC version of PSTM got the 3 .8 times shorter computing time.