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<h4 class="subsection">6.12.6 MPI Wisdom Communication</h4>
<p>To facilitate synchronizing wisdom among the different MPI processes,
we provide two functions:
<p><a name="index-fftw_005fmpi_005fgather_005fwisdom-492"></a><a name="index-fftw_005fmpi_005fbroadcast_005fwisdom-493"></a>
<pre class="example"> void fftw_mpi_gather_wisdom(MPI_Comm comm);
void fftw_mpi_broadcast_wisdom(MPI_Comm comm);
</pre>
<p>The <code>fftw_mpi_gather_wisdom</code> function gathers all wisdom in the
given communicator <code>comm</code> to the process of rank 0 in the
communicator: that process obtains the union of all wisdom on all the
processes. As a side effect, some other processes will gain
additional wisdom from other processes, but only process 0 will gain
the complete union.
<p>The <code>fftw_mpi_broadcast_wisdom</code> does the reverse: it exports
wisdom from process 0 in <code>comm</code> to all other processes in the
communicator, replacing any wisdom they currently have.
<p>See <a href="FFTW-MPI-Wisdom.html#FFTW-MPI-Wisdom">FFTW MPI Wisdom</a>.
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