slides - Spring School in Advanced Computing TACC @ UP

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Why Hybrid? • Eliminates domain decomposition at node • Automatic coherency at node • Lower memory latency and data movement within node • Can synchronize on memory instead of barrier 2
Why Hybrid? (cont 1) • Only profitable if on-node aggregation of MPI parallel components is faster as a single SMP algorithm (or a single SMP algorithm on each socket). 3
Page 1: Hybrid Computing Lars Koesterke Uni
Page 5 and 6: Node Views CPU OpenMP CPU CPU CPU C
Page 7 and 8: NUMA Operations • Ways Process Af
Page 9 and 10: Modes of MPI/Thread Operation • S
Page 11 and 12: SMP Nodes Hybrid Batch Script 16 th
Page 13 and 14: SMP Sockets Hybrid Batch Script 4 t
Page 15 and 16: MPI with OpenMP -- Messaging Single
Page 17 and 18: Syntax: MPI2 MPI_Init_thread call M
Page 19 and 20: MPI Call through Master • MPI_THR
Page 21 and 22: MPI Call within Single • MPI_THRE
Page 23 and 24: Overlapping Communication and Work
Page 25 and 26: Thread-rank Communication • Can u
Page 27 and 28: NUMA in Code • Scheduling Affinit
Page 29 and 30: Conclusion • Placement and bindin

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