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author Chris Cannam
date Wed, 20 Mar 2013 15:35:50 +0000
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3 <title>MPI Wisdom Communication - FFTW 3.3.3</title>
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48 <a name="MPI-Wisdom-Communication"></a>
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50 Previous:&nbsp;<a rel="previous" accesskey="p" href="MPI-Plan-Creation.html#MPI-Plan-Creation">MPI Plan Creation</a>,
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54
55 <h4 class="subsection">6.12.6 MPI Wisdom Communication</h4>
56
57 <p>To facilitate synchronizing wisdom among the different MPI processes,
58 we provide two functions:
59
60 <p><a name="index-fftw_005fmpi_005fgather_005fwisdom-492"></a><a name="index-fftw_005fmpi_005fbroadcast_005fwisdom-493"></a>
61 <pre class="example"> void fftw_mpi_gather_wisdom(MPI_Comm comm);
62 void fftw_mpi_broadcast_wisdom(MPI_Comm comm);
63 </pre>
64 <p>The <code>fftw_mpi_gather_wisdom</code> function gathers all wisdom in the
65 given communicator <code>comm</code> to the process of rank 0 in the
66 communicator: that process obtains the union of all wisdom on all the
67 processes. As a side effect, some other processes will gain
68 additional wisdom from other processes, but only process 0 will gain
69 the complete union.
70
71 <p>The <code>fftw_mpi_broadcast_wisdom</code> does the reverse: it exports
72 wisdom from process 0 in <code>comm</code> to all other processes in the
73 communicator, replacing any wisdom they currently have.
74
75 <p>See <a href="FFTW-MPI-Wisdom.html#FFTW-MPI-Wisdom">FFTW MPI Wisdom</a>.
76
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