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mpi_stubs.html
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<html>
<head>
<title>
MPI_STUBS - Dummy MPI Library
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
MPI_STUBS <br> Dummy MPI Library
</h1>
<hr>
<p>
<b>MPI_STUBS</b>
is a C++ library which
implements "stub" MPI routines.
</p>
<p>
<b>MPI_STUBS</b> 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.
</p>
<p>
<b>MPI_STUBS</b> 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.
</p>
<p>
<b>MPI_STUBS</b> is based on a similar package supplied as
part of the <b>LAMMPS</b> program, which allow that program to
be compiled, linked and run on a single processor machine,
although it is normally intended for parallel execution.
</p>
<p>
<b>
This C++ implementation is very sketchy. I am struggling to
implement it in a way that includes an MPI namespace.
</b>
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files described and made available on this web page
are distributed under
<a href = "../../txt/gnu_lgpl.txt">the GNU LGPL license.</a>
</p>
<h3 align = "center">
Languages:
</h3>
<p>
<b>MPI_STUBS</b> is available in
<a href = "../../c_src/mpi_stubs/mpi_stubs.html">a C version</a> and
<a href = "../../cpp_src/mpi_stubs/mpi_stubs.html">a C++ version</a> and
<a href = "../../f77_src/mpi_stubs/mpi_stubs.html">a FORTRAN77 version</a> and
<a href = "../../f_src/mpi_stubs/mpi_stubs.html">a FORTRAN90 version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../cpp_src/hello_mpi/hello_mpi.html">
HELLO_MPI</a>,
a C++ program which
prints out "Hello, world!" using the MPI parallel programming environment.
</p>
<p>
<a href = "../../examples/moab/moab.html">
MOAB</a>,
examples which
illustrate the use of the MOAB job scheduler for a computer cluster.
</p>
<p>
<a href = "../../cpp_src/mpi/mpi.html">
MPI</a>,
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.
</p>
<p>
<a href = "../../cpp_src/multitask_mpi/multitask_mpi.html">
MULTITASK_MPI</a>,
a C++ program which
demonstrates how to "multitask", that is, to execute several unrelated
and distinct tasks simultaneously, using MPI for parallel execution.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
William Gropp, Ewing Lusk, Anthony Skjellum,<br>
Using MPI: Portable Parallel Programming with the
Message-Passing Interface,<br>
Second Edition,<br>
MIT Press, 1999,<br>
ISBN: 0262571323,<br>
LC: QA76.642.G76.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "mpi_stubs.cpp">mpi_stubs.cpp</a>, the source code.
</li>
<li>
<a href = "mpi_stubs.hpp">mpi_stubs.hpp</a>, the include file.
</li>
<li>
<a href = "mpi_stubs.sh">mpi_stubs.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples:
</h3>
<p>
<b>HELLO</b> is a simple program that says "Hello, world!".
<ul>
<li>
<a href = "hello.cpp">hello.cpp</a>,
a sample calling program.
</li>
<li>
<a href = "hello.sh">hello.sh</a>,
commands to compile and run the sample program.
</li>
<li>
<a href = "hello_output.txt">hello_output.txt</a>,
the output file.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>MPI::COMM::GET_RANK</b> reports the rank of the calling process.
</li>
<li>
<b>MPI::COMM::GET_SIZE</b> reports the number of processes in a communicator.
</li>
<li>
<b>MPI::FINALIZE</b> shuts down the MPI library.
</li>
<li>
<b>MPI::INIT</b> initializes the MPI library.
</li>
<li>
<b>MPI::WTICK</b> returns the number of seconds in one tick of the timer.
</li>
<li>
<b>MPI::WTIME</b> returns the elapsed wall clock time.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../cpp_src.html">
the C++ source codes</a>.
</p>
<hr>
<i>
Last revised on 13 January 2012.
</i>
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