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

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MPI inter process communication MPI on Multi core CPU node node network MPI_BCAST node node Re-design applications 1 MPI process / core - Stress network - Stress OS Many MPI codes heavily use ALLTOALL communication Messages = processes * processes We need to exploit the hierarchy Mix message passing and multi-threading www.cineca.it 10
Hybrid Model Multi-node SMP (Symmetric Multiprocessor) connected by an interconnection network. Each node is mapped (at least) a process MPI and more OpenMP threads www.cineca.it 11
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: Processors: trends Aggregate Number
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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