Il sistema di calcolo ad alte prestazioni del CINECA: evoluzione di ...

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MPI_THREAD_MULTIPLE - Multiple threads may call MPI anytime with no restrictions. - Less restrictive and very flexible, but the application becomes very complicated to handle www.cineca.it 28
HPC Evolution From Herb Sutter Moore’s law is holding, in the number of transistors – Transistors on an ASIC still doubling every 18 months at constant cost – 15 years of exponential clock rate growth has ended Moore’s Law reinterpreted – Performance improvements are now coming from the increase in the number of cores on a processor (ASIC) – #cores per chip doubles every 18 months instead of clock – 64-512 threads per node will become visible soon www.cineca.it 29
Page 1 and 2: CINECA Casalecchio di Reno (BO) www
Page 3 and 4: Parallel Architectures P P M P P SM
Page 5 and 6: Process A process is created by the
Page 7 and 8: MPI Execution Model - Single Progra
Page 9 and 10: Processors: trends Aggregate Number
Page 11 and 12: Hybrid Model Multi-node SMP (Symmet
Page 13 and 14: www.cineca.it 13
Page 15 and 16: Domain decomposition /1 The hybrid
Page 17 and 18: MPI plus OpenMP Pro: Better use o
Page 19 and 20: Hybrid pseudo code call MPI_INIT (i
Page 21 and 22: Mixed paradigm www.cineca.it 21
Page 23 and 24: MPI_THREAD_SINGLE (master only) !$O
Page 25 and 26: MPI_THREAD_FUNNELED - calls outside
Page 27: MPI_THREAD_SERIALIZED • Outside t
Page 31 and 32: Real HPC Crisis is with Software A
Page 33: Some Current Unmet Needs Performanc

Il sistema di calcolo ad alte prestazioni del CINECA: evoluzione di ...

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