S4595-openacc-openmp4-apps-gpu-xeon-phi

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OpenMP 4.0 for Accelerators• Released in July 2013, it supports on directivebasedprogramming on accelerators, such asGPU and Xeon Phi• Directives for– Parallelism: target/parallel– Data: target data– Two levels of parallelism: teams/distribute6
OpenACC2Parallel KernelDataLoopHost dataCacheUpdateWaitDeclare {enter, exit} datarou>neAsync waitTile Device_typeAtomicN/AOpenMP4TargetN/ATarget DataDistribute/Do/for/SIMDN/AN/ATarget UpdateN/ADeclare TargetN/ADeclare targetN/AN/AN/AAtomicCri>cal sec>ons… BarrierOpenACC2 has richer features than OpenMP4 7
Page 1 and 2: 2014@San JoseShanghai Jiao Tong Un
Page 3 and 4: Why Direc>ve-‐based Programmi
Page 5: OpenACC2• Standard version evolut
Page 9 and 10: HOMP, OpenMP compiler for CUDA
Page 13 and 14: Performance impact of K40 and
Page 15 and 16: Performance Portability• Include
Page 17 and 18: Op>miza>on for Portable Performa
Page 19 and 20: Shared Memory/L2 (SHMEM) Level
Page 21 and 22: SIMD Friendly Algorithm [ISCA12]
Page 24 and 25: Outline• OpenACC2 and OpenMP4•

S4595-openacc-openmp4-apps-gpu-xeon-phi

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