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<body lang="en">
<a name="MPI-Initialization"></a>
<div class="header">
<p>
Next: <a href="Using-MPI-Plans.html#Using-MPI-Plans" accesskey="n" rel="next">Using MPI Plans</a>, Previous: <a href="MPI-Files-and-Data-Types.html#MPI-Files-and-Data-Types" accesskey="p" rel="prev">MPI Files and Data Types</a>, Up: <a href="FFTW-MPI-Reference.html#FFTW-MPI-Reference" 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#Concept-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="MPI-Initialization-1"></a>
<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>
<a name="index-fftw_005fmpi_005finit-4"></a>
<div class="example">
<pre class="example">void fftw_mpi_init(void);
</pre></div>

<a name="index-fftw_005finit_005fthreads-3"></a>
<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">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>
<a name="index-fftw_005fmpi_005fcleanup-1"></a>
<div class="example">
<pre class="example">void fftw_mpi_cleanup(void);
</pre></div>

<a name="index-fftw_005fcleanup-1"></a>
<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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