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Introduction to Parallel Programming with MPI and OpenMP

Introduction to Parallel Programming with MPI and OpenMPCharles AugustineOctober 29, 2018 Goals of Workshop Have basic understanding of Parallel Programming MPI OpenMP Run a few examples of C/C++ code on Princeton HPC systems. Be aware of some of the common problems and pitfalls Be knowledgeable enough to learn more (advanced topics) on your ownParallel Programming AnalogySource: No free lunch - can t just turn on Parallel Parallel Programming requires work Code modification always Algorithm modification often New sneaky bugs you bet Speedup limited by many factorsRealistic Expectations Ex.

• OpenCL, Chapel, Co -array Fortran, Unified Parallel C (UPC) CPU. Memory. CPU. Memory. Message. Message. Memory. CPU. CPU. MPI. OpenMP. MPI • Message Passing Interface • Standard • MPI-1 – Covered here • MPI-2 – Added features ... • Within the communicator, comm • MPI_COMM_WORLD is set during Init(…) • Other communicators ...

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