slides - Spring School in Advanced Computing TACC @ UP

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Overlapping Communication and Work include ‘mpi.h’  program hybover  !$OMP parallel     if (ithread .eq. 0) then        call MPI_(…,ierr)     else             endif  !$OMP end parallel  end  Fortran  C  #include   int main(int argc, char **argv){   int rank, size, ierr, i;  #pragma omp parallel  {     if (thread == 0){        ierr=MPI_(…)     }    if(thread != 0){        work    }  }  24
Thread-rank Communication • Can use thread id and rank in communication • Example illustrates technique in multithread “ping” (send/receive) example. 25
Page 1 and 2: Hybrid Computing Lars Koesterke Uni
Page 3 and 4: Why Hybrid? (cont 1) • Only profi
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: Overlapping Communication and Work
Page 27 and 28: NUMA in Code • Scheduling Affinit
Page 29 and 30: Conclusion • Placement and bindin

slides - Spring School in Advanced Computing TACC @ UP

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