Exploiting and Evaluating OpenSHMEM on KNL Architecture

摘要

Manycore processors such as Intel Xeon Phi (KNL) with on-package Multi-Channel DRAM (MCDRAM) are making a paradigm shift in the High Performance Computing (HPC) industry. PGAS programming models such as OpenSHMEM due to its lightweight synchronization primitives and shared memory abstractions are considered a good fit for irregular communication patterns. While regular programming models such as MPI/OpenMP have started utilizing systems with KNL processors, it is still not clear whether PGAS models can easily adopt and fully utilize such systems. In this paper, we conduct a comprehensive performance evaluation of the OpenSHMEM runtime on many-/multi-core processors. We also explore the performance benefits offered by the highly multithreaded KNL along with the AVX-512 extensions and MCDRAM for OpenSHMEM programming model. We evaluate Intra- and Inter-node performance of OpenSHMEM primitives on different application kernels. Our evaluation of application kernels such as NAS Parallel Benchmark and 3D-Stencil kernels show that OpenSHMEM with MVPAICH2-X runtime is able to take advantage of AVX-512 extensions and MCDRAM to exploit the architectural features provided by KNL processors.