MULTITASK_MPI
Carrying Out Multiple "Tasks" in MPI


MULTITASK_MPI is a C++ program which demonstrates how to "multitask", that is, to execute several unrelated and distinct tasks simultaneously, using MPI for parallel execution.

In this example, there is a "master" process, identified as process 0, and two worker processes, 1 and 2. Process 0 does nothing but choose the input for the worker processes, transmit it, and wait for the computed results to be returned. The programs executed by process 1 and by process 2 are quite different.

While the typical MPI model has all the worker processes executing the same program, this example shows that that is not necessary.

The latest versions of MPI no longer support the special C++ MPI bindings, so the examples given here have reverted to using the C MPI bindings.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

MULTITASK_MPI is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version.

Related Data and Programs:

COMMUNICATOR_MPI, a C++ program which creates new communicators involving a subset of initial set of MPI processes in the default communicator MPI_COMM_WORLD.

HEAT_MPI, a C++ program which solves the 1D Time Dependent Heat Equation using MPI.

HELLO_MPI, a C++ program which prints out "Hello, world!" using the MPI parallel programming environment.

MPI, C++ programs which illustrate the use of the MPI application program interface for carrying out parallel computatioins in a distributed memory environment.

MULTITASK_OPENMP, a C++ program which demonstrates how to "multitask", that is, to execute several unrelated and distinct tasks simultaneously, using OpenMP for parallel execution.

PRIME_MPI, a C++ program which counts the number of primes between 1 and N, using MPI for parallel execution.

QUAD_MPI, a C++ program which approximates an integral using a quadrature rule, and carries out the computation in parallel using MPI.

RANDOM_MPI, a C++ program which demonstrates one way to generate the same sequence of random numbers for both sequential execution and parallel execution under MPI.

RING_MPI, a C++ program which uses the MPI parallel programming environment, and measures the time necessary to copy a set of data around a ring of processes.

SATISFY_MPI, a C++ program which demonstrates, for a particular circuit, an exhaustive search for solutions of the circuit satisfiability problem, using MPI to carry out the calculation in parallel.

SEARCH_MPI, a C++ program which searches integers between A and B for a value J such that F(J) = C, using MPI for parallel execution.

WAVE_MPI, a C++ program which uses finite differences and MPI to estimate a solution to the wave equation.

Reference:

  1. William Gropp, Steven Huss-Lederman, Andrew Lumsdaine, Ewing Lusk, Bill Nitzberg, William Saphir, Marc Snir,
    MPI: The Complete Reference,
    Volume II: The MPI-2 Extensions,
    Second Edition,
    MIT Press, 1998.
  2. William Gropp, Ewing Lusk, Anthony Skjellum,
    Using MPI: Portable Parallel Programming with the Message-Passing Interface,
    Second Edition,
    MIT Press, 1999,
    ISBN: 0262571323.
  3. William Gropp, Ewing Lusk, Rajiv Thakur,
    Using MPI-2: Advanced Features of the Message-Passing Interface,
    Second Edition,
    MIT Press, 1999,
    ISBN: 0262571331.
  4. Stan Openshaw, Ian Turton,
    High Performance Computing and the Art of Parallel Programming: an Introduction for Geographers, Social Scientists, and Engineers,
    Routledge, 2000,
    ISBN: 0415156920.
  5. Peter Pacheco,
    Parallel Programming with MPI,
    Morgan Kaufman, 1996,
    ISBN: 1558603395,
    LC: QA76.642.P3.
  6. Marc Snir, Steve Otto, Steven Huss-Lederman, David Walker, Jack Dongarra,
    MPI: The Complete Reference,
    Volume I: The MPI Core,
    Second Edition,
    MIT Press, 1998,
    ISBN: 0-262-69216-3,
    LC: QA76.642.M65.
  7. The MPI web site at Argonne National Lab: http://www-unix.mcs.anl.gov/mpi/
  8. The Message Passing Interface Forum,
    MPI: A Message Passing Interface Standard,
    1995,
    Available online from the MPI Forum.
  9. The Message Passing Interface Forum,
    MPI-2: Extensions to the Message Passing Interface,
    1997,
    Available online from the MPI Forum.

Source Code:

Examples and Tests:

MULTITASK_FSU compiles and runs the program on the FSU HPC cluster.

MULTITASK_LOCAL compiles and runs the program on the local system, which might work if OpenMPI is installed, and which might make sense if your system has multiple cores.

You can go up one level to the C++ source codes.


Last revised on 20 October 2011.