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We have developed the astrophysical simulation code XFLAT to study neutrinooscillations in supernovae. XFLAT is designed to utilize multiple levels ofparallelism through MPI, OpenMP, and SIMD instructions (vectorization). It canrun on both CPU and Xeon Phi co-processors based on the Intel Many IntegratedCore Architecture (MIC). We analyze the performance of XFLAT on configurationswith CPU only, Xeon Phi only and both CPU and Xeon Phi. We also investigate theimpact of I/O and the multi-node performance of XFLAT on the Xeon Phi-equippedStampede supercomputer at the Texas Advanced Computing Center (TACC).

Performance Analysis of an Astrophysical Simulation Code on the Intel Xeon Phi Architecture