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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<span id="MPI-Initialization"></span><div class="header">
<p>
Next: <a href="Using-MPI-Plans.html" accesskey="n" rel="next">Using MPI Plans</a>, Previous: <a href="MPI-Files-and-Data-Types.html" accesskey="p" rel="prev">MPI Files and Data Types</a>, Up: <a href="FFTW-MPI-Reference.html" accesskey="u" rel="up">FFTW MPI Reference</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<span id="MPI-Initialization-1"></span><h4 class="subsection">6.12.2 MPI Initialization</h4>
<p>Before calling any other FFTW MPI (&lsquo;<samp>fftw_mpi_</samp>&rsquo;) function, and
before importing any wisdom for MPI problems, you must call:
</p>
<span id="index-fftw_005fmpi_005finit-4"></span>
<div class="example">
<pre class="example">void fftw_mpi_init(void);
</pre></div>
<span id="index-fftw_005finit_005fthreads-3"></span>
<p>If FFTW threads support is used, however, <code>fftw_mpi_init</code> should
be called <em>after</em> <code>fftw_init_threads</code> (see <a href="Combining-MPI-and-Threads.html">Combining MPI and Threads</a>). Calling <code>fftw_mpi_init</code> additional times (before
<code>fftw_mpi_cleanup</code>) has no effect.
</p>
<p>If you want to deallocate all persistent data and reset FFTW to the
pristine state it was in when you started your program, you can call:
</p>
<span id="index-fftw_005fmpi_005fcleanup-1"></span>
<div class="example">
<pre class="example">void fftw_mpi_cleanup(void);
</pre></div>
<span id="index-fftw_005fcleanup-1"></span>
<p>(This calls <code>fftw_cleanup</code>, so you need not call the serial
cleanup routine too, although it is safe to do so.) After calling
<code>fftw_mpi_cleanup</code>, all existing plans become undefined, and you
should not attempt to execute or destroy them. You must call
<code>fftw_mpi_init</code> again after <code>fftw_mpi_cleanup</code> if you want
to resume using the MPI FFTW routines.
</p>
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