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

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False sharing in OpenMP #pragma omp parallel for shared(A) schedule(static,1) for (int i=0; i
Hybrid pseudo code call MPI_INIT (ierr) call MPI_COMM_RANK (…) call MPI_COMM_SIZE (…) … some computation and MPI communication call OMP_SET_NUM_THREADS(4) !$OMP PARALLEL !$OMP DO do i=1,n … computation enddo !$OMP END DO !$OMP END PARALLEL … some computation and MPI communication call MPI_FINALIZE (ierr) www.cineca.it 19
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: MPI plus OpenMP Pro: Better use o
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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