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Parallel Programming Examples using MPI
Shodor > CSERD > Resources > Tutorials > Parallel Programming Examples using MPI
  Overview  •   Parameter Space Study  •   The Game of Life  •   GalaxSee  •   Intermediate MPI Examples

Parallel Programming Examples Using MPI

Intermediate MPI Examples

The following are example MPI programs that use MPI commands other than the basic 6 MPI commands.

  • Cartesian Functions
  • Pack and Unpack
  • Reduce
  • Allgather
  • Vector Types

    Cartesian Functions

    The life program is solved using cartesian functions.

    Uses: MPI_Cart_create MPI_Cart_shift MPI_Sendrecv

  • Life with cartesian functions

    Pack and Unpack

    GalaxSee uses MPI_Pack to reduce the number of sends and receives.

    Uses: MPI_Pack MPI_Unpack

  • GalaxSee with pack functions

    Reduce

    The third example uses the fire code from the Basic MPI tutorial, with all nodes solving fewer iterations of the entire range of probabilities, but averaging results using MPI_Reduce.

    Uses: MPI_Reduce, MPI_Op options (translated by Google)

  • Fire with reduce functions

    Allgather

    This example shows a simple use of the allgather command to combine three small arrays on different processes into one large array which exists on all processes.

    Uses: MPI_Allgather

  • Allgather example

    Vector Types

    The fourth example uses a defined MPI_Datatype to create a strided vector out of a matrix.

    Uses: MPI_Type_vector MPI_Type_commit

  • matrix_send.c
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