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| <h2><span class="refentrytitle">Function broadcast</span></h2> |
| <p>boost::mpi::broadcast — Broadcast a value from a root process to all other processes. </p> |
| </div> |
| <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> |
| <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../mpi/reference.html#header.boost.mpi.collectives_hpp" title="Header <boost/mpi/collectives.hpp>">boost/mpi/collectives.hpp</a>> |
| |
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| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> |
| <span class="keyword">void</span> <span class="identifier">broadcast</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="communicator.html" title="Class communicator">communicator</a> <span class="special">&</span> comm<span class="special">,</span> <span class="identifier">T</span> <span class="special">&</span> value<span class="special">,</span> <span class="keyword">int</span> root<span class="special">)</span><span class="special">;</span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> |
| <span class="keyword">void</span> <span class="identifier">broadcast</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="communicator.html" title="Class communicator">communicator</a> <span class="special">&</span> comm<span class="special">,</span> <span class="identifier">T</span> <span class="special">*</span> values<span class="special">,</span> <span class="keyword">int</span> n<span class="special">,</span> <span class="keyword">int</span> root<span class="special">)</span><span class="special">;</span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> |
| <span class="keyword">void</span> <span class="identifier">broadcast</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="communicator.html" title="Class communicator">communicator</a> <span class="special">&</span> comm<span class="special">,</span> <a class="link" href="skeleton_proxy.html" title="Struct template skeleton_proxy">skeleton_proxy</a><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span> <span class="special">&</span> value<span class="special">,</span> |
| <span class="keyword">int</span> root<span class="special">)</span><span class="special">;</span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> |
| <span class="keyword">void</span> <span class="identifier">broadcast</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="communicator.html" title="Class communicator">communicator</a> <span class="special">&</span> comm<span class="special">,</span> <span class="keyword">const</span> <a class="link" href="skeleton_proxy.html" title="Struct template skeleton_proxy">skeleton_proxy</a><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span> <span class="special">&</span> value<span class="special">,</span> |
| <span class="keyword">int</span> root<span class="special">)</span><span class="special">;</span></pre></div> |
| <div class="refsect1"> |
| <a name="id2031087"></a><h2>Description</h2> |
| <p><code class="computeroutput">broadcast</code> is a collective algorithm that transfers a value from an arbitrary <code class="computeroutput">root</code> process to every other process that is part of the given communicator. The <code class="computeroutput">broadcast</code> algorithm can transmit any Serializable value, values that have associated MPI data types, packed archives, skeletons, and the content of skeletons; see the <code class="computeroutput">send</code> primitive for communicators for a complete list. The type <code class="computeroutput">T</code> shall be the same for all processes that are a part of the communicator <code class="computeroutput">comm</code>, unless packed archives are being transferred: with packed archives, the root sends a <code class="computeroutput">packed_oarchive</code> or <code class="computeroutput">packed_skeleton_oarchive</code> whereas the other processes receive a <code class="computeroutput">packed_iarchive</code> or <code class="computeroutput">packed_skeleton_iarchve</code>, respectively.</p> |
| <p>When the type <code class="computeroutput">T</code> has an associated MPI data type, this routine invokes <code class="computeroutput">MPI_Bcast</code> to perform the broadcast.</p> |
| <p> |
| </p> |
| <div class="variablelist"><table border="0"> |
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| <td><p><span class="term">Parameters:</span></p></td> |
| <td><div class="variablelist"><table border="0"> |
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| <tr> |
| <td><p><span class="term"><code class="computeroutput">comm</code></span></p></td> |
| <td><p>The communicator over which the broadcast will occur.</p></td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><code class="computeroutput">root</code></span></p></td> |
| <td><p>The rank/process ID of the process that will be transmitting the value. </p></td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><code class="computeroutput">value</code></span></p></td> |
| <td><p>The value (or values, if <code class="computeroutput">n</code> is provided) to be transmitted (if the rank of <code class="computeroutput">comm</code> is equal to <code class="computeroutput">root</code>) or received (if the rank of <code class="computeroutput">comm</code> is not equal to <code class="computeroutput">root</code>). When the <code class="computeroutput">value</code> is a <code class="computeroutput">skeleton_proxy</code>, only the skeleton of the object will be broadcast. In this case, the <code class="computeroutput">root</code> will build a skeleton from the object help in the proxy and all of the non-roots will reshape the objects held in their proxies based on the skeleton sent from the root.</p></td> |
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| <td align="right"><div class="copyright-footer">Copyright © 2005-2007 Douglas Gregor, |
| Matthias Troyer, Trustees of Indiana University<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top"> |
| http://www.boost.org/LICENSE_1_0.txt </a>) |
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