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53 lines
3.5 KiB
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
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<title>MPI On Cell (Documentation): Groups, Context and Communicators</title>
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<link href="../../doxygen.css" rel="stylesheet" type="text/css">
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<link href="../../tabs.css" rel="stylesheet" type="text/css">
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</head><body>
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<!-- Generated by Doxygen 1.5.6 -->
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<div class="navigation" id="top">
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<div class="tabs">
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<ul>
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<li><a href="../../main.html"><span>Main Page</span></a></li>
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<li><a href="../../modules.html"><span>Modules</span></a></li>
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<li><a href="../../annotated.html"><span>Data Structures</span></a></li>
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</ul>
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</div>
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</div>
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<div class="contents">
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<h1>Groups, Context and Communicators<br>
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<small>
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[<a class="el" href="../../d3/d9e/group__end__user.html">End-User Documentation</a>]</small>
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</h1>
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<p>
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Collaboration diagram for Groups, Context and Communicators:</div>
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<div class="dynsection">
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<center><table><tr><td><img src="../../d1/df0/group__comm__main.png" border="0" alt="" usemap="#d8/d49/d1_2df0_2group____comm____main_map">
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<map name="d8/d49/d1_2df0_2group____comm____main_map">
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<area shape="rect" href="../../d1/dd1/group__comm__mgt.html" title="Funktions for managing communicators." alt="" coords="507,5,691,32"><area shape="rect" href="../../d3/d9e/group__end__user.html" title="This section describes the public API provided by the MOC-library." alt="" coords="7,5,172,32"></map></td></tr></table></center>
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</div>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
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The MOC communicator specifies a group of processes inside which a communication occurs.
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<p>
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Initially there is a single communicator, MPI_COMM_WORLD, which contains all of the processes involved in the computation.<p>
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Currently there is no support for creating and managing user-defined groups and communicators and probably never will be. The local storage of a SPU is very small and also the maximal number of nodes is limited to a small number and so there is doubt if the benefits will be greater than the overhead introduced by supporting user-defined groups and communicators.<p>
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Only the predefined communicators <a class="el" href="../../d1/dd1/group__comm__mgt.html#g14e1cb53b99b5e239d4cc6a8d370ad94">MOC_COMM_WORLD</a>, <a class="el" href="../../d1/dd1/group__comm__mgt.html#gf8c5dfb6bb79027948fe63f4cf6504eb">MOC_COMM_SELF</a> and <a class="el" href="../../d1/dd1/group__comm__mgt.html#gcae012270d1813b9153b8cbc78a5c84d">MOC_COMM_NULL</a> are available.<p>
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The only operations which are currently implemented are <a class="el" href="../../d1/dd1/group__comm__mgt.html#g36ac8a2d969216d52418aedd77a5829e">MOC_Comm_size</a> and <a class="el" href="../../d1/dd1/group__comm__mgt.html#gbadd556e16667ac8ee86af72299e4915">MOC_Comm_rank</a>.
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<p>
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<table border="0" cellpadding="0" cellspacing="0">
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<tr><td></td></tr>
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<tr><td colspan="2"><br><h2>Modules</h2></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="../../d1/dd1/group__comm__mgt.html">Communicator Management</a></td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Funktions for managing communicators. <br></td></tr>
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<p>
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</table>
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</div>
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<hr size="1"><address style="text-align: right;"><small>Generated on Thu Feb 12 13:48:22 2009 for MPI On Cell (Documentation) by
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<a href="http://www.doxygen.org/index.html">
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<img src="../../doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.6 </small></address>
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