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

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OpenMP Execution Model - A single thread starts execute sequentially - When a parallel region is reached, several slave threads are forked to run in parallel - At the end of the parallel region, all the slave threads die - Only the master thread continues the sequential execution www.cineca.it 8
Processors: trends Aggregate Number of Core for Top500 Supercomputers www.cineca.it 9 number of cores 3000000 2500000 2000000 1500000 1000000 500000 0 giu-93 giu-94 giu-95 giu-96 giu-97 giu-98 giu-99 giu-00 years giu-01 giu-02 giu-03 giu-04 giu-05 giu-06 giu-07 giu-08
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: MPI Execution Model - Single Progra
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 and 28: MPI_THREAD_SERIALIZED • Outside t
Page 29 and 30: HPC Evolution From Herb Sutter Moor
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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