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<h1>dox/Parallel/vtkBlockDistribution.h</h1><a href="a03274.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*=========================================================================</span>
<a name="l00002"></a>00002 <span class="comment"></span>
<a name="l00003"></a>00003 <span class="comment">  Program:   Visualization Toolkit</span>
<a name="l00004"></a>00004 <span class="comment">  Module:    $RCSfile: vtkBlockDistribution.h,v $</span>
<a name="l00005"></a>00005 <span class="comment"></span>
<a name="l00006"></a>00006 <span class="comment">  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen</span>
<a name="l00007"></a>00007 <span class="comment">  All rights reserved.</span>
<a name="l00008"></a>00008 <span class="comment">  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.</span>
<a name="l00009"></a>00009 <span class="comment"></span>
<a name="l00010"></a>00010 <span class="comment">     This software is distributed WITHOUT ANY WARRANTY; without even</span>
<a name="l00011"></a>00011 <span class="comment">     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR</span>
<a name="l00012"></a>00012 <span class="comment">     PURPOSE.  See the above copyright notice for more information.</span>
<a name="l00013"></a>00013 <span class="comment"></span>
<a name="l00014"></a>00014 <span class="comment">=========================================================================*/</span>
<a name="l00015"></a>00015 <span class="comment">/* </span>
<a name="l00016"></a>00016 <span class="comment"> * Copyright (C) 2008 The Trustees of Indiana University.</span>
<a name="l00017"></a>00017 <span class="comment"> * Use, modification and distribution is subject to the Boost Software</span>
<a name="l00018"></a>00018 <span class="comment"> * License, Version 1.0. (See http://www.boost.org/LICENSE_1_0.txt)</span>
<a name="l00019"></a>00019 <span class="comment"> */</span>
<a name="l00027"></a>00027 <span class="preprocessor">#ifndef __vtkBlockDistribution_h</span>
<a name="l00028"></a>00028 <span class="preprocessor"></span><span class="preprocessor">#define __vtkBlockDistribution_h</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span>
<a name="l00030"></a><a class="code" href="a00176.html">00030</a> <span class="keyword">class </span><a class="code" href="a02170.html#873ca0b83d0838a1df577536068a1730">VTK_COMMON_EXPORT</a> <a class="code" href="a00176.html" title="A helper class that manages a block distribution of N elements of data.">vtkBlockDistribution</a>
<a name="l00031"></a>00031 {
<a name="l00032"></a>00032 <span class="keyword">public</span>:
<a name="l00034"></a>00034   <a class="code" href="a00176.html" title="A helper class that manages a block distribution of N elements of data.">vtkBlockDistribution</a>(<a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> N, <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> P);
<a name="l00035"></a>00035 
<a name="l00038"></a><a class="code" href="a00176.html#64af98d2714ee98b3a59071055a0c0c7">00038</a>   <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> GetNumElements() { <span class="keywordflow">return</span> this-&gt;NumElements; }
<a name="l00039"></a>00039 
<a name="l00042"></a><a class="code" href="a00176.html#9d7bfcc445dc450f77b1d86729b7457b">00042</a>   <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> GetNumProcessors() { <span class="keywordflow">return</span> this-&gt;NumProcessors; }
<a name="l00043"></a>00043 
<a name="l00046"></a>00046   <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> GetBlockSize(<a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> rank);
<a name="l00047"></a>00047 
<a name="l00050"></a>00050   <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> GetProcessorOfElement(<a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> globalIndex);
<a name="l00051"></a>00051 
<a name="l00054"></a>00054   <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> GetLocalIndexOfElement(<a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> globalIndex);
<a name="l00055"></a>00055 
<a name="l00058"></a>00058   <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> GetFirstGlobalIndexOnProcessor(<a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> rank);
<a name="l00059"></a>00059 
<a name="l00062"></a>00062   <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> GetGlobalIndex(<a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> localIndex, <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> rank);
<a name="l00063"></a>00063 
<a name="l00064"></a>00064 <span class="keyword">private</span>:
<a name="l00065"></a>00065   <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> NumElements;
<a name="l00066"></a>00066   <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> NumProcessors;
<a name="l00067"></a>00067 };
<a name="l00068"></a>00068 
<a name="l00069"></a>00069 <span class="comment">// ----------------------------------------------------------------------</span>
<a name="l00070"></a>00070 
<a name="l00071"></a><a class="code" href="a00176.html#dc583d820e553ab25bf0d5343c5381e7">00071</a> <span class="keyword">inline</span> <a class="code" href="a00176.html#dc583d820e553ab25bf0d5343c5381e7">vtkBlockDistribution::vtkBlockDistribution</a>(<a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> N, <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> P)
<a name="l00072"></a>00072   : NumElements(N), NumProcessors(P) 
<a name="l00073"></a>00073 { 
<a name="l00074"></a>00074 }
<a name="l00075"></a>00075 
<a name="l00076"></a>00076 <span class="comment">// ----------------------------------------------------------------------</span>
<a name="l00077"></a>00077 
<a name="l00078"></a><a class="code" href="a00176.html#e19645d592deff0066163084581c197d">00078</a> <span class="keyword">inline</span> <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> <a class="code" href="a00176.html#e19645d592deff0066163084581c197d">vtkBlockDistribution::GetBlockSize</a>(<a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> rank)
<a name="l00079"></a>00079 {
<a name="l00080"></a>00080   <span class="keywordflow">return</span> (this-&gt;NumElements / this-&gt;NumProcessors) 
<a name="l00081"></a>00081        + (rank &lt; this-&gt;NumElements % this-&gt;NumProcessors? 1 : 0);
<a name="l00082"></a>00082 }
<a name="l00083"></a>00083 
<a name="l00084"></a>00084 <span class="comment">// ----------------------------------------------------------------------</span>
<a name="l00085"></a>00085 
<a name="l00086"></a>00086 <span class="keyword">inline</span> <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> 
<a name="l00087"></a><a class="code" href="a00176.html#79d87a503c236c88b2f97c3224e8ff68">00087</a> <a class="code" href="a00176.html#79d87a503c236c88b2f97c3224e8ff68">vtkBlockDistribution::GetProcessorOfElement</a>(<a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> globalIndex)
<a name="l00088"></a>00088 {
<a name="l00089"></a>00089   <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> smallBlockSize = this-&gt;NumElements / this-&gt;NumProcessors;
<a name="l00090"></a>00090   <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> cutoffProcessor = this-&gt;NumElements % this-&gt;NumProcessors;
<a name="l00091"></a>00091   <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> cutoffIndex = cutoffProcessor * (smallBlockSize + 1);
<a name="l00092"></a>00092   
<a name="l00093"></a>00093   <span class="keywordflow">if</span> (globalIndex &lt; cutoffIndex) 
<a name="l00094"></a>00094     {
<a name="l00095"></a>00095     <span class="keywordflow">return</span> globalIndex / (smallBlockSize + 1);
<a name="l00096"></a>00096     }
<a name="l00097"></a>00097   <span class="keywordflow">else</span> 
<a name="l00098"></a>00098     {
<a name="l00099"></a>00099     <span class="keywordflow">return</span> cutoffProcessor + (globalIndex - cutoffIndex) / smallBlockSize;
<a name="l00100"></a>00100     }
<a name="l00101"></a>00101 }
<a name="l00102"></a>00102 
<a name="l00103"></a>00103 <span class="comment">// ----------------------------------------------------------------------</span>
<a name="l00104"></a>00104 
<a name="l00105"></a>00105 <span class="keyword">inline</span> <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> 
<a name="l00106"></a><a class="code" href="a00176.html#71c4b0e8f91a5ebc206a4867d8d13b59">00106</a> <a class="code" href="a00176.html#71c4b0e8f91a5ebc206a4867d8d13b59">vtkBlockDistribution::GetLocalIndexOfElement</a>(<a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> globalIndex)
<a name="l00107"></a>00107 {
<a name="l00108"></a>00108   <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> rank = this-&gt;<a class="code" href="a00176.html#79d87a503c236c88b2f97c3224e8ff68">GetProcessorOfElement</a>(globalIndex);
<a name="l00109"></a>00109   <span class="keywordflow">return</span> globalIndex - this-&gt;<a class="code" href="a00176.html#c10af45ad3b8192922d3ba32cb123335">GetFirstGlobalIndexOnProcessor</a>(rank);
<a name="l00110"></a>00110 }
<a name="l00111"></a>00111 
<a name="l00112"></a>00112 <span class="comment">// ----------------------------------------------------------------------</span>
<a name="l00113"></a>00113 
<a name="l00114"></a>00114 <span class="keyword">inline</span> <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> 
<a name="l00115"></a><a class="code" href="a00176.html#c10af45ad3b8192922d3ba32cb123335">00115</a> <a class="code" href="a00176.html#c10af45ad3b8192922d3ba32cb123335">vtkBlockDistribution::GetFirstGlobalIndexOnProcessor</a>(<a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> rank)
<a name="l00116"></a>00116 {
<a name="l00117"></a>00117   <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> estimate = rank * (this-&gt;NumElements / this-&gt;NumProcessors + 1);
<a name="l00118"></a>00118   <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> cutoffProcessor = this-&gt;NumElements % this-&gt;NumProcessors;
<a name="l00119"></a>00119   <span class="keywordflow">if</span> (rank &lt; cutoffProcessor) 
<a name="l00120"></a>00120     {
<a name="l00121"></a>00121     <span class="keywordflow">return</span> estimate;
<a name="l00122"></a>00122     }
<a name="l00123"></a>00123   <span class="keywordflow">else</span> 
<a name="l00124"></a>00124     {
<a name="l00125"></a>00125     <span class="keywordflow">return</span> estimate - (rank - cutoffProcessor);
<a name="l00126"></a>00126     }
<a name="l00127"></a>00127 }
<a name="l00128"></a>00128 
<a name="l00129"></a>00129 <span class="comment">// ----------------------------------------------------------------------</span>
<a name="l00130"></a>00130 
<a name="l00131"></a>00131 <span class="keyword">inline</span> <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> 
<a name="l00132"></a><a class="code" href="a00176.html#233257d9419731ab35651c645293c008">00132</a> <a class="code" href="a00176.html#233257d9419731ab35651c645293c008">vtkBlockDistribution::GetGlobalIndex</a>(<a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> localIndex, <a class="code" href="a02149.html#20bd6b6dedfe1bbb096c50354d52cc7e">vtkIdType</a> rank)
<a name="l00133"></a>00133 {
<a name="l00134"></a>00134   <span class="keywordflow">return</span> this-&gt;<a class="code" href="a00176.html#c10af45ad3b8192922d3ba32cb123335">GetFirstGlobalIndexOnProcessor</a>(rank) + localIndex;
<a name="l00135"></a>00135 }
<a name="l00136"></a>00136 
<a name="l00137"></a>00137 <span class="preprocessor">#endif</span>
</pre></div></div>
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