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<html>
<head>
<title>
MULTITASK_MPI - Carrying Out Multiple "Tasks" in MPI
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
MULTITASK_MPI <br> Carrying Out Multiple "Tasks" in MPI
</h1>
<hr>
<p>
<b>MULTITASK_MPI</b>
is a C++ program which
demonstrates how to "multitask", that is, to execute several unrelated
and distinct tasks simultaneously, using MPI for parallel execution.
</p>
<p>
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.
</p>
<p>
While the typical MPI model has all the worker processes executing the
same program, this example shows that that is not necessary.
</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>MULTITASK_MPI</b> is available in
<a href = "../../c_src/multitask_mpi/multitask_mpi.html">a C version</a> and
<a href = "../../cpp_src/multitask_mpi/multitask_mpi.html">a C++ version</a> and
<a href = "../../f77_src/multitask_mpi/multitask_mpi.html">a FORTRAN77 version</a> and
<a href = "../../f_src/multitask_mpi/multitask_mpi.html">a FORTRAN90 version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../cpp_src/communicator_mpi/communicator_mpi.html">
COMMUNICATOR_MPI</a>,
a C++ program which
creates new communicators involving a subset of initial
set of MPI processes in the default communicator MPI_COMM_WORLD.
</p>
<p>
<a href = "../../cpp_src/heat_mpi/heat_mpi.html">
HEAT_MPI</a>,
a C++ program which
solves the 1D Time Dependent Heat Equation using MPI.
</p>
<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
illustrate the use of the MPI application program interface
for carrying out parallel computatioins in a distributed memory environment.
</p>
<p>
<a href = "../../cpp_src/multitask_openmp/multitask_openmp.html">
MULTITASK_OPENMP</a>,
a C++ program which
demonstrates how to "multitask", that is, to execute several unrelated
and distinct tasks simultaneously, using OpenMP for parallel execution.
</p>
<p>
<a href = "../../cpp_src/prime_mpi/prime_mpi.html">
PRIME_MPI</a>,
a C++ program which
counts the number of primes between 1 and N, using MPI for parallel execution.
</p>
<p>
<a href = "../../cpp_src/quad_mpi/quad_mpi.html">
QUAD_MPI</a>,
a C++ program which
approximates an integral using a quadrature rule, and carries out the
computation in parallel using MPI.
</p>
<p>
<a href = "../../cpp_src/random_mpi/random_mpi.html">
RANDOM_MPI</a>,
a C++ program which
demonstrates one way to generate the same sequence of random numbers
for both sequential execution and parallel execution under MPI.
</p>
<p>
<a href = "../../cpp_src/ring_mpi/ring_mpi.html">
RING_MPI</a>,
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.
</p>
<p>
<a href = "../../cpp_src/satisfy_mpi/satisfy_mpi.html">
SATISFY_MPI</a>,
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.
</p>
<p>
<a href = "../../cpp_src/search_mpi/search_mpi.html">
SEARCH_MPI</a>,
a C++ program which
searches integers between A and B for a value J such that F(J) = C,
using MPI for parallel execution.
</p>
<p>
<a href = "../../cpp_src/wave_mpi/wave_mpi.html">
WAVE_MPI</a>,
a C++ program which
uses finite differences and MPI to estimate a solution to the
wave equation.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
William Gropp, Steven Huss-Lederman, Andrew Lumsdaine, Ewing Lusk,
Bill Nitzberg,
William Saphir, Marc Snir,<br>
MPI: The Complete Reference,<br>
Volume II: The MPI-2 Extensions,<br>
Second Edition,<br>
MIT Press, 1998.
</li>
<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.
</li>
<li>
William Gropp, Ewing Lusk, Rajiv Thakur,<br>
Using MPI-2: Advanced Features of the Message-Passing
Interface,<br>
Second Edition,<br>
MIT Press, 1999,<br>
ISBN: 0262571331.
</li>
<li>
Stan Openshaw, Ian Turton,<br>
High Performance Computing and the Art of Parallel Programming:
an Introduction for Geographers, Social Scientists, and
Engineers,<br>
Routledge, 2000,<br>
ISBN: 0415156920.
</li>
<li>
Peter Pacheco,<br>
Parallel Programming with MPI,<br>
Morgan Kaufman, 1996,<br>
ISBN: 1558603395,<br>
LC: QA76.642.P3.
</li>
<li>
Marc Snir, Steve Otto, Steven Huss-Lederman, David Walker,
Jack Dongarra,<br>
MPI: The Complete Reference,<br>
Volume I: The MPI Core,<br>
Second Edition,<br>
MIT Press, 1998,<br>
ISBN: 0-262-69216-3,<br>
LC: QA76.642.M65.
</li>
<li>
The MPI web site at Argonne National Lab:
<a href = "http://www-unix.mcs.anl.gov/mpi/">http://www-unix.mcs.anl.gov/mpi/</a>
</li>
<li>
The Message Passing Interface Forum,<br>
<b>MPI: A Message Passing Interface Standard</B>,<br>
1995,<br>
Available online from
<a href = "http://www.mpi-forum.org/">the MPI Forum</a>.
</li>
<li>
The Message Passing Interface Forum,<br>
<b>MPI-2: Extensions to the Message Passing Interface</B>,<br>
1997,<br>
Available online from
<a href = "http://www.mpi-forum.org/">the MPI Forum</a>.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "multitask_mpi.cpp">multitask_mpi.cpp</a>, the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<b>MULTITASK_FSU</b> compiles and runs the program on the FSU HPC cluster.
<ul>
<li>
<a href = "multitask_fsu.sh">multitask_fsu.sh</a>,
the MOAB script.
</li>
<li>
<a href = "multitask_fsu_output.txt">multitask_fsu_output.txt</a>,
the output file.
</li>
</ul>
</p>
<p>
<b>MULTITASK_LOCAL</b> 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.
<ul>
<li>
<a href = "multitask_local.sh">multitask_local.sh</a>,
the script.
</li>
<li>
<a href = "multitask_local_output.txt">multitask_local_output.txt</a>,
the output file.
</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 20 October 2011.
</i>
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