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<h4 class="subsection">6.12.1 MPI Files and Data Types</h4>
<p>All programs using FFTW's MPI support should include its header file:
<pre class="example"> #include <fftw3-mpi.h>
</pre>
<p>Note that this header file includes the serial-FFTW <code>fftw3.h</code>
header file, and also the <code>mpi.h</code> header file for MPI, so you
need not include those files separately.
<p>You must also link to <em>both</em> the FFTW MPI library and to the
serial FFTW library. On Unix, this means adding <code>-lfftw3_mpi
-lfftw3 -lm</code> at the end of the link command.
<p><a name="index-precision-433"></a>Different precisions are handled as in the serial interface:
See <a href="Precision.html#Precision">Precision</a>. That is, ‘<samp><span class="samp">fftw_</span></samp>’ functions become
<code>fftwf_</code> (in single precision) etcetera, and the libraries become
<code>-lfftw3f_mpi -lfftw3f -lm</code> etcetera on Unix. Long-double
precision is supported in MPI, but quad precision (‘<samp><span class="samp">fftwq_</span></samp>’) is
not due to the lack of MPI support for this type.
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