jburkardt

MPI_STUBS\ Dummy MPI Library {#mpi_stubs-dummy-mpi-library align=”center”} =================

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MPI_STUBS is a C++ library which implements “stub” MPI routines.

MPI_STUBS is intended to include stubs for the most commonly called MPI routines. Most of the stub routines don’t do anything. In a few cases, where it makes sense, they do some simple action or return a value that is appropriate for the serial processing case.

MPI_STUBS can be used as a convenience, when a real MPI implementation is not available, and the user simply wants to test-compile a code. It may also be useful in those occasions when a code has been so carefully written that it will still execute correctly on a single processor.

MPI_STUBS is based on a similar package supplied as part of the LAMMPS program, which allow that program to be compiled, linked and run on a single processor machine, although it is normally intended for parallel execution.

This C++ implementation is very sketchy. I am struggling to implement it in a way that includes an MPI namespace.

Licensing: {#licensing align=”center”}

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

Languages: {#languages align=”center”}

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

Related Data and Programs: {#related-data-and-programs align=”center”}

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

MOAB, examples which illustrate the use of the MOAB job scheduler for a computer cluster.

MPI, C++ programs which demonstrate a message passing library which enables parallel processing on a variety of machine architectures, and with a varying number of processors.

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

Reference: {#reference align=”center”}

1. William Gropp, Ewing Lusk, Anthony Skjellum,\ Using MPI: Portable Parallel Programming with the Message-Passing Interface,\ Second Edition,\ MIT Press, 1999,\ ISBN: 0262571323,\ LC: QA76.642.G76.

Source Code: {#source-code align=”center”}

• mpi_stubs.cpp, the source code.
• mpi_stubs.hpp, the include file.

Examples: {#examples align=”center”}

HELLO is a simple program that says “Hello, world!”.

• hello.cpp, a sample calling program.
• hello_output.txt, the output file.

List of Routines: {#list-of-routines align=”center”}

• MPI::COMM::GET_RANK reports the rank of the calling process.
• MPI::COMM::GET_SIZE reports the number of processes in a communicator.
• MPI::FINALIZE shuts down the MPI library.
• MPI::INIT initializes the MPI library.
• MPI::WTICK returns the number of seconds in one tick of the timer.
• MPI::WTIME returns the elapsed wall clock time.

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

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Last revised on 13 January 2012.