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<div class="title">Parallelizer.h</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// This file is part of Eigen, a lightweight C++ template library</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// for linear algebra.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">//</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// Copyright (C) 2010 Gael Guennebaud <gael.guennebaud@inria.fr></span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">//</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// This Source Code Form is subject to the terms of the Mozilla</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// Public License v. 2.0. If a copy of the MPL was not distributed</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> </div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#ifndef EIGEN_PARALLELIZER_H</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor"></span><span class="preprocessor">#define EIGEN_PARALLELIZER_H</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="keyword">namespace </span>Eigen { </div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="keyword">namespace </span>internal {</div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> manage_multi_threading(Action action, <span class="keywordtype">int</span>* v)</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> {</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  <span class="keyword">static</span> EIGEN_UNUSED <span class="keywordtype">int</span> m_maxThreads = -1;</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keywordflow">if</span>(action==SetAction)</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  {</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  eigen_internal_assert(v!=0);</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  m_maxThreads = *v;</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  }</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span>(action==GetAction)</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  {</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  eigen_internal_assert(v!=0);</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor"> #ifdef EIGEN_HAS_OPENMP</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor"></span> <span class="keywordflow">if</span>(m_maxThreads>0)</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  *v = m_maxThreads;</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  *v = omp_get_max_threads();</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor"> #else</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor"></span> *v = 1;</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor"> #endif</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor"></span> }</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  {</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  eigen_internal_assert(<span class="keyword">false</span>);</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  }</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> }</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> }</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div>
<div class="line"><a name="l00048"></a><span class="lineno"><a class="line" href="namespaceEigen.html#a820c0e0460934cc17eb6dacbad54a9f5"> 48</a></span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="namespaceEigen.html#a820c0e0460934cc17eb6dacbad54a9f5">initParallel</a>()</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> {</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordtype">int</span> nbt;</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  internal::manage_multi_threading(GetAction, &nbt);</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  std::ptrdiff_t l1, l2;</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  internal::manage_caching_sizes(GetAction, &l1, &l2);</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> }</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
<div class="line"><a name="l00058"></a><span class="lineno"><a class="line" href="namespaceEigen.html#a9aca97d83e21b91a04ec079360dfffeb"> 58</a></span> <span class="keyword">inline</span> <span class="keywordtype">int</span> <a class="code" href="namespaceEigen.html#a9aca97d83e21b91a04ec079360dfffeb">nbThreads</a>()</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> {</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordtype">int</span> ret;</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  internal::manage_multi_threading(GetAction, &ret);</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordflow">return</span> ret;</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> }</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div>
<div class="line"><a name="l00067"></a><span class="lineno"><a class="line" href="namespaceEigen.html#af9cd17c2fe18204239cd11c88c120b50"> 67</a></span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="namespaceEigen.html#af9cd17c2fe18204239cd11c88c120b50">setNbThreads</a>(<span class="keywordtype">int</span> v)</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> {</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  internal::manage_multi_threading(SetAction, &v);</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> }</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="keyword">namespace </span>internal {</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="keyword">template</span><<span class="keyword">typename</span> Index> <span class="keyword">struct </span>GemmParallelInfo</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> {</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  GemmParallelInfo() : sync(-1), users(0), rhs_start(0), rhs_length(0) {}</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordtype">int</span> <span class="keyword">volatile</span> sync;</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordtype">int</span> <span class="keyword">volatile</span> users;</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> </div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  Index rhs_start;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  Index rhs_length;</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> };</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="keyword">template</span><<span class="keywordtype">bool</span> Condition, <span class="keyword">typename</span> Functor, <span class="keyword">typename</span> Index></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="keywordtype">void</span> parallelize_gemm(<span class="keyword">const</span> Functor& func, Index rows, Index cols, <span class="keywordtype">bool</span> transpose)</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> {</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="comment">// TODO when EIGEN_USE_BLAS is defined,</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="comment">// we should still enable OMP for other scalar types</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="preprocessor">#if !(defined (EIGEN_HAS_OPENMP)) || defined (EIGEN_USE_BLAS)</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="preprocessor"></span> <span class="comment">// FIXME the transpose variable is only needed to properly split</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="comment">// the matrix product when multithreading is enabled. This is a temporary</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="comment">// fix to support row-major destination matrices. This whole</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="comment">// parallelizer mechanism has to be redisigned anyway.</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  EIGEN_UNUSED_VARIABLE(transpose);</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  func(0,rows, 0,cols);</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="comment">// Dynamically check whether we should enable or disable OpenMP.</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="comment">// The conditions are:</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="comment">// - the max number of threads we can create is greater than 1</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="comment">// - we are not already in a parallel code</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="comment">// - the sizes are large enough</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> </div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="comment">// 1- are we already in a parallel session?</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="comment">// FIXME omp_get_num_threads()>1 only works for openmp, what if the user does not use openmp?</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordflow">if</span>((!Condition) || (omp_get_num_threads()>1))</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordflow">return</span> func(0,rows, 0,cols);</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> </div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  Index size = transpose ? cols : rows;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> </div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="comment">// 2- compute the maximal number of threads from the size of the product:</span></div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="comment">// FIXME this has to be fine tuned</span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  Index max_threads = std::max<Index>(1,size / 32);</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> </div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="comment">// 3 - compute the number of threads we are going to use</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  Index threads = std::min<Index>(<a class="code" href="namespaceEigen.html#a9aca97d83e21b91a04ec079360dfffeb">nbThreads</a>(), max_threads);</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordflow">if</span>(threads==1)</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordflow">return</span> func(0,rows, 0,cols);</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> </div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <a class="code" href="namespaceEigen.html#a820c0e0460934cc17eb6dacbad54a9f5">Eigen::initParallel</a>();</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  func.initParallelSession();</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> </div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">if</span>(transpose)</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  std::swap(rows,cols);</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> </div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  Index blockCols = (cols / threads) & ~Index(0x3);</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  Index blockRows = (rows / threads) & ~Index(0x7);</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  </div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  GemmParallelInfo<Index>* info = <span class="keyword">new</span> GemmParallelInfo<Index>[threads];</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> </div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="preprocessor"> #pragma omp parallel for schedule(static,1) num_threads(threads)</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="preprocessor"></span> <span class="keywordflow">for</span>(Index i=0; i<threads; ++i)</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  {</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  Index r0 = i*blockRows;</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  Index actualBlockRows = (i+1==threads) ? rows-r0 : blockRows;</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> </div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  Index c0 = i*blockCols;</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  Index actualBlockCols = (i+1==threads) ? cols-c0 : blockCols;</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> </div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  info[i].rhs_start = c0;</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  info[i].rhs_length = actualBlockCols;</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> </div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keywordflow">if</span>(transpose)</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  func(0, cols, r0, actualBlockRows, info);</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  func(r0, actualBlockRows, 0,cols, info);</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  }</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> </div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="keyword">delete</span>[] info;</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> <span class="preprocessor"></span>}</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> </div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> } <span class="comment">// end namespace internal</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> </div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> } <span class="comment">// end namespace Eigen</span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> </div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="preprocessor">#endif // EIGEN_PARALLELIZER_H</span></div>
<div class="ttc" id="namespaceEigen_html_a820c0e0460934cc17eb6dacbad54a9f5"><div class="ttname"><a href="namespaceEigen.html#a820c0e0460934cc17eb6dacbad54a9f5">Eigen::initParallel</a></div><div class="ttdeci">void initParallel()</div><div class="ttdef"><b>Definition:</b> Parallelizer.h:48</div></div>
<div class="ttc" id="namespaceEigen_html_a9aca97d83e21b91a04ec079360dfffeb"><div class="ttname"><a href="namespaceEigen.html#a9aca97d83e21b91a04ec079360dfffeb">Eigen::nbThreads</a></div><div class="ttdeci">int nbThreads()</div><div class="ttdef"><b>Definition:</b> Parallelizer.h:58</div></div>
<div class="ttc" id="namespaceEigen_html_af9cd17c2fe18204239cd11c88c120b50"><div class="ttname"><a href="namespaceEigen.html#af9cd17c2fe18204239cd11c88c120b50">Eigen::setNbThreads</a></div><div class="ttdeci">void setNbThreads(int v)</div><div class="ttdef"><b>Definition:</b> Parallelizer.h:67</div></div>
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