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<div class="headertitle"><div class="title">phase_transition_mpi.cpp</div></div>
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<a href="phase__transition__mpi_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span> </div>
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<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="preprocessor">#include "<a class="code" href="data__type_8hpp.html">data_type.hpp</a>"</span></div>
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<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="preprocessor">#include "<a class="code" href="monte__carlo_8hpp.html">monte_carlo.hpp</a>"</span></div>
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<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="preprocessor">#include "<a class="code" href="utils_8hpp.html">utils.hpp</a>"</span></div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span> </div>
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="preprocessor">#include <algorithm></span></div>
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="preprocessor">#include <fstream></span></div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="preprocessor">#include <iostream></span></div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="preprocessor">#include <iterator></span></div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="preprocessor">#include <mpi.h></span></div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="preprocessor">#include <sstream></span></div>
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<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span> </div>
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<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"><a class="line" href="phase__transition__mpi_8cpp.html#a3c04138a5bfe5d72780bb7e82a18e627"> 24</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="test__suite_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)</div>
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<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span>{</div>
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> <span class="keywordflow">if</span> (argc < 5) {</div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> std::cout << <span class="stringliteral">"You need at least 4 arguments"</span> << std::endl;</div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> abort();</div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> }</div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> <span class="keywordtype">double</span> t0, t1;</div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> t0 = MPI_Wtime();</div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> <span class="keywordtype">double</span> start = atof(argv[1]), end = atof(argv[2]);</div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> <span class="keywordtype">int</span> points = atoi(argv[3]), N;</div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> <span class="keywordtype">int</span> lattice_sizes[] = {20, 40, 60, 80, 100};</div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> <span class="keywordtype">double</span> dt = (end - start) / points;</div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> <span class="keywordtype">int</span> cycles = atoi(argv[4]);</div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> std::ofstream ofile;</div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> </div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> <a class="code hl_class" href="classdata__t.html">data_t</a> data[points];</div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> </div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> <span class="comment">// MPI stuff</span></div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> <span class="keywordtype">int</span> rank, cluster_size;</div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> </div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> <span class="comment">// Initialize MPI</span></div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> MPI_Init(&argc, &argv);</div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> </div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <span class="comment">// Get the cluster size and rank</span></div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> MPI_Comm_size(MPI_COMM_WORLD, &cluster_size);</div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> MPI_Comm_rank(MPI_COMM_WORLD, &rank);</div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> </div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <span class="keywordtype">int</span> remainder = points % cluster_size;</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> <span class="keywordtype">double</span> i_start;</div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> <span class="keywordtype">int</span> i_points;</div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> <span class="comment">// Distribute temperature points</span></div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> <span class="keywordflow">if</span> (rank < remainder) {</div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> i_points = points / cluster_size + 1;</div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> i_start = start + dt * i_points * rank;</div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> }</div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> <span class="keywordflow">else</span> {</div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> i_points = points / cluster_size;</div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> i_start = start + dt * (i_points * rank + remainder);</div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> }</div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> </div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> <a class="code hl_class" href="classdata__t.html">data_t</a> i_data[i_points];</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> std::cout << <span class="stringliteral">"Rank "</span> << rank << <span class="stringliteral">": "</span> << i_points << <span class="charliteral">','</span> << i_start << <span class="charliteral">'\n'</span>;</div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> </div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> L : lattice_sizes) {</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> N = L * L;</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < i_points; i++) {</div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> i_data[i] = <a class="code hl_function" href="monte__carlo_8hpp.html#acc34e2049a5030874f6f548f3adab958">monte_carlo_parallel</a>(L, i_start + dt * i, cycles);</div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> }</div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> </div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="keywordflow">if</span> (rank == 0) {</div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> std::copy_n(i_data, i_points, data);</div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 1; i < cluster_size; i++) {</div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> <span class="keywordflow">if</span> (rank < remainder) {</div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> MPI_Recv((<span class="keywordtype">void</span> *)i_data,</div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> <span class="keyword">sizeof</span>(<a class="code hl_class" href="classdata__t.html">data_t</a>) * (points / cluster_size + 1),</div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> MPI_CHAR, i, MPI_ANY_TAG, MPI_COMM_WORLD,</div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> MPI_STATUS_IGNORE);</div>
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> std::copy_n(i_data, points / cluster_size + 1,</div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> data + (points / cluster_size) * i);</div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> }</div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> <span class="keywordflow">else</span> {</div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> MPI_Recv((<span class="keywordtype">void</span> *)i_data,</div>
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> <span class="keyword">sizeof</span>(<a class="code hl_class" href="classdata__t.html">data_t</a>) * (points / cluster_size), MPI_CHAR,</div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> i, MPI_ANY_TAG, MPI_COMM_WORLD, MPI_STATUS_IGNORE);</div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> std::copy_n(i_data, points / cluster_size,</div>
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<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> data + (points / cluster_size) * i + remainder);</div>
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<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> }</div>
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<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> }</div>
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<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> std::stringstream outfile;</div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> outfile << <span class="stringliteral">"output/phase_transition/size_"</span> << L << <span class="stringliteral">".txt"</span>;</div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> utils::mkpath(utils::dirname(outfile.str()));</div>
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> ofile.open(outfile.str());</div>
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<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> </div>
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<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> <span class="keywordtype">double</span> temp, CV, X;</div>
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<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> </div>
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<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> <span class="keyword">using </span>utils::scientific_format;</div>
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<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < points; i++) {</div>
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<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> temp = start + dt * i;</div>
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<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> CV = (data[i].E2 - data[i].E * data[i].E)</div>
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<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> / ((<span class="keywordtype">double</span>)N * temp * temp);</div>
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<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> X = (data[i].M2 - data[i].M_abs * data[i].M_abs)</div>
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<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> / ((<span class="keywordtype">double</span>)N * temp);</div>
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<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> </div>
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<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> ofile << scientific_format(temp) << <span class="charliteral">','</span></div>
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<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> << scientific_format(data[i].E / N) << <span class="charliteral">','</span></div>
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<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> << scientific_format(data[i].M_abs / N) << <span class="charliteral">','</span></div>
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<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> << scientific_format(CV) << <span class="charliteral">','</span> << scientific_format(X)</div>
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<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> << <span class="charliteral">'\n'</span>;</div>
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<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> }</div>
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<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> ofile.close();</div>
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<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> }</div>
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<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> <span class="keywordflow">else</span> {</div>
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<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> MPI_Send(i_data, i_points * <span class="keyword">sizeof</span>(<a class="code hl_class" href="classdata__t.html">data_t</a>), MPI_CHAR, 0, rank,</div>
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<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> MPI_COMM_WORLD);</div>
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<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> }</div>
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<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span> }</div>
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<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> </div>
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<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> t1 = MPI_Wtime();</div>
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<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span> </div>
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<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span> <span class="keywordflow">if</span> (rank == 0) {</div>
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<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span> std::cout << <span class="stringliteral">"Time: "</span> << t1 - t0 << <span class="stringliteral">" seconds\n"</span>;</div>
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<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span> }</div>
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<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> </div>
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<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span> MPI_Finalize();</div>
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<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span>}</div>
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<div class="ttc" id="aclassdata__t_html"><div class="ttname"><a href="classdata__t.html">data_t</a></div><div class="ttdef"><b>Definition:</b> <a href="data__type_8hpp_source.html#l00018">data_type.hpp:18</a></div></div>
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<div class="ttc" id="adata__type_8hpp_html"><div class="ttname"><a href="data__type_8hpp.html">data_type.hpp</a></div><div class="ttdoc">Header for the data_t type.</div></div>
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<div class="ttc" id="amonte__carlo_8hpp_html"><div class="ttname"><a href="monte__carlo_8hpp.html">monte_carlo.hpp</a></div><div class="ttdoc">Functions for monte carlo simulations.</div></div>
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<div class="ttc" id="amonte__carlo_8hpp_html_acc34e2049a5030874f6f548f3adab958"><div class="ttname"><a href="monte__carlo_8hpp.html#acc34e2049a5030874f6f548f3adab958">monte_carlo_parallel</a></div><div class="ttdeci">data_t monte_carlo_parallel(int L, double T, int cycles)</div><div class="ttdoc">Execute the Metropolis algorithm for a certain amount of Monte Carlo cycles in parallel.</div><div class="ttdef"><b>Definition:</b> <a href="monte__carlo_8cpp_source.html#l00128">monte_carlo.cpp:128</a></div></div>
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<div class="ttc" id="atest__suite_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="test__suite_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a></div><div class="ttdeci">int main()</div><div class="ttdoc">The main function.</div><div class="ttdef"><b>Definition:</b> <a href="test__suite_8cpp_source.html#l00148">test_suite.cpp:148</a></div></div>
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<div class="ttc" id="autils_8hpp_html"><div class="ttname"><a href="utils_8hpp.html">utils.hpp</a></div><div class="ttdoc">Function prototypes and macros that are useful.</div></div>
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