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ring_mpi.html
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<html>
<head>
<title>
RING_MPI - Estimating Communication Rates in MPI
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
RING_MPI <br> Estimating Communication Rates in MPI
</h1>
<hr>
<p>
<b>RING_MPI</b>
is a FORTRAN90 program which
estimates the time it takes to send a vector of N double precision values
through each process in a ring.
</p>
<p>
Process 0 sends N double precision values to process 1, which passes them
to process 2, and so on, until process P-1 sends them back to process 0.
The time for this transmission is recorded. The experiment is repeated
several times, and for several different array sizes N.
</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>RING_MPI</b> is available in
<a href = "../../c_src/ring_mpi/ring_mpi.html">a C version</a> and
<a href = "../../cpp_src/ring_mpi/ring_mpi.html">a C++ version</a> and
<a href = "../../f77_src/ring_mpi/ring_mpi.html">a FORTRAN77 version</a> and
<a href = "../../f_src/ring_mpi/ring_mpi.html">a FORTRAN90 version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../f_src/communicator_mpi/communicator_mpi.html">
COMMUNICATOR_MPI</a>,
a FORTRAN90 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 = "../../f_src/heat_mpi/heat_mpi.html">
HEAT_MPI</a>,
a FORTRAN90 program which
solves the 1D Time Dependent Heat Equation using MPI.
</p>
<p>
<a href = "../../f_src/hello_mpi/hello_mpi.html">
HELLO_MPI</a>,
a FORTRAN90 program which
prints out "Hello, world!" using MPI for parallel execution.
</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 = "../../f_src/mpi/mpi.html">
MPI</a>,
FORTRAN90 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 = "../../f_src/mpi_stubs/mpi_stubs.html">
MPI_STUBS</a>,
a FORTRAN90 library which
contains "stub" MPI routines, allowing a user to compile, load, and possibly
run an MPI program on a serial machine.
</p>
<p>
<a href = "../../f_src/multitask_mpi/multitask_mpi.html">
MULTITASK_MPI</a>,
a FORTRAN90 program which
demonstrates how to "multitask", that is, to execute several unrelated
and distinct tasks simultaneously, using MPI for parallel execution.
</p>
<p>
<a href = "../../f_src/prime_mpi/prime_mpi.html">
PRIME_MPI</a>,
a FORTRAN90 program which
counts the number of primes between 1 and N, using MPI for parallel execution.
</p>
<p>
<a href = "../../f_src/quad_mpi/quad_mpi.html">
QUAD_MPI</a>,
a FORTRAN90 program which
approximates an integral using a quadrature rule, and carries out the
computation in parallel using MPI.
</p>
<p>
<a href = "../../f_src/random_mpi/random_mpi.html">
RANDOM_MPI</a>,
a FORTRAN90 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 = "../../f_src/satisfy_mpi/satisfy_mpi.html">
SATISFY_MPI</a>,
a FORTRAN90 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 = "../../f_src/search_mpi/search_mpi.html">
SEARCH_MPI</a>,
a FORTRAN90 program which
searches integers between A and B for a value J such that F(J) = C,
using MPI for parallel execution.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Peter Pacheco,<br>
Parallel Programming with MPI,<br>
Morgan Kaufman, 1996,<br>
ISBN: 1558603395,<br>
LC: QA76.642.P3.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "ring_mpi.f90">ring_mpi.f90</a>, the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<b>RING_FSU</b> compiles and runs the program on the FSU HPC cluster.
<ul>
<li>
<a href = "ring_fsu.sh">ring_fsu.sh</a>,
the MOAB script.
</li>
<li>
<a href = "ring_fsu_output.txt">ring_fsu_output.txt</a>,
the output file.
</li>
</ul>
</p>
<p>
<b>RING_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 = "ring_local.sh">ring_local.sh</a>,
the script.
</li>
<li>
<a href = "ring_local_output.txt">ring_local_output.txt</a>,
the output file.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../f_src.html">
the FORTRAN90 source codes</a>.
</p>
<hr>
<i>
Last revised on 19 October 2012.
</i>
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