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">
