create the plan, since one of the possible algorithms that
FFTW uses for an out-of-place transpose <em>is</em> simply to call
<code>MPI_Alltoall</code>.  However, FFTW also considers several other
possible algorithms that, depending on your MPI implementation and
your hardware, may be faster.
<a name="index-FFTW_005fMEASURE-3"></a>
<a name="index-FFTW_005fPATIENT-4"></a>
</p>



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