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<p class="caption"><span class="caption-text">Appendix</span></p>
<ul class="current">
<li class="toctree-l1 current"><a class="current reference internal" href="#">Benchmarks</a><ul>
<li class="toctree-l2"><a class="reference internal" href="#convergence-of-the-energy">Convergence of the energy</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#variational-energy">Variational energy</a></li>
<li class="toctree-l3"><a class="reference internal" href="#variational-energy-pt2-correction">Variational energy + PT2 correction</a></li>
</ul>
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<li class="toctree-l2"><a class="reference internal" href="#davidson-s-diagonalization">Davidsons diagonalization</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#olympe">Olympe</a></li>
<li class="toctree-l3"><a class="reference internal" href="#irene">Irene</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#pt2-correction">PT2 correction</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#id1">Olympe</a></li>
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<div class="section" id="benchmarks">
<h1>Benchmarks<a class="headerlink" href="#benchmarks" title="Permalink to this headline"></a></h1>
<p>The determinant selection, MR-PT2 and diagonalization are parallelized with
distributed parallelism. Benchmarks for the [NH2-CH-NH2]+ molecule in the
aug-cc-pVDZ basis set are presented with up to 50 nodes (1800 cores) on
CALMIPs <a class="reference external" href="https://www.calmip.univ-toulouse.fr/spip.php?article582&amp;lang=fr">Olympe</a> supercomputer, and 200 nodes (9600 cores) on GENCIs
<a class="reference external" href="http://www-hpc.cea.fr/en/complexe/tgcc-Irene.htm">Irene</a> supercomputer. This represents an active space of 18 electrons
in 111 MOs.</p>
<ul class="simple">
<li>Nodes of Olympe have two Skylake sockets, 2x18 cores &#64; 2.3GHz.</li>
<li>Nodes of Irene have two Skylake sockets, 2x24 cores &#64; 2.7GHz.</li>
</ul>
<div class="section" id="convergence-of-the-energy">
<h2>Convergence of the energy<a class="headerlink" href="#convergence-of-the-energy" title="Permalink to this headline"></a></h2>
<div class="figure" id="id5">
<img alt="Convergence of the energy." src="../_images/cn3_energy.png" />
<p class="caption"><span class="caption-text">Convergence of the variational energy, with and without the PT2 correction.
Both energies converge to the (frozen core) FCI energy.
The plot is displayed for the ground state and for the 1st excited state.</span></p>
</div>
<div class="section" id="variational-energy">
<h3>Variational energy<a class="headerlink" href="#variational-energy" title="Permalink to this headline"></a></h3>
<table border="1" class="docutils">
<colgroup>
<col width="25%" />
<col width="25%" />
<col width="25%" />
<col width="24%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Number of dets</th>
<th class="head">Ground state</th>
<th class="head">Excited state</th>
<th class="head">Excitation (eV)</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>7</td>
<td>-149.489 186</td>
<td>-149.207 354</td>
<td>7.67</td>
</tr>
<tr class="row-odd"><td>123</td>
<td>-149.536 265</td>
<td>-149.261 860</td>
<td>7.47</td>
</tr>
<tr class="row-even"><td>3 083</td>
<td>-149.685 606</td>
<td>-149.404 450</td>
<td>7.65</td>
</tr>
<tr class="row-odd"><td>29 409</td>
<td>-149.826 151</td>
<td>-149.547 275</td>
<td>7.59</td>
</tr>
<tr class="row-even"><td>168 595</td>
<td>-149.900 352</td>
<td>-149.626 058</td>
<td>7.46</td>
</tr>
<tr class="row-odd"><td>1 322 537</td>
<td>-149.946 655</td>
<td>-149.675 032</td>
<td>7.39</td>
</tr>
<tr class="row-even"><td>8 495 334</td>
<td>-149.972 032</td>
<td>-149.704 145</td>
<td>7.29</td>
</tr>
<tr class="row-odd"><td>9 356 952</td>
<td>-149.973 375</td>
<td>-149.706 822</td>
<td>7.25</td>
</tr>
<tr class="row-even"><td>42 779 636</td>
<td>-149.987 370</td>
<td>-149.721 470</td>
<td>7.24</td>
</tr>
<tr class="row-odd"><td>186 978 487</td>
<td>-149.998 582</td>
<td>-149.733 039</td>
<td>7.23</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="variational-energy-pt2-correction">
<h3>Variational energy + PT2 correction<a class="headerlink" href="#variational-energy-pt2-correction" title="Permalink to this headline"></a></h3>
<table border="1" class="docutils">
<colgroup>
<col width="25%" />
<col width="25%" />
<col width="25%" />
<col width="24%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Number of dets</th>
<th class="head">Ground state</th>
<th class="head">Excited state</th>
<th class="head">Excitation (eV)</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>7</td>
<td>-150.161 107</td>
<td>-149.904 883</td>
<td>6.97</td>
</tr>
<tr class="row-odd"><td>123</td>
<td>-150.116 958</td>
<td>-149.849 465</td>
<td>7.28</td>
</tr>
<tr class="row-even"><td>3 083</td>
<td>-150.043 5(2)</td>
<td>-149.780 8(2)</td>
<td>7.15</td>
</tr>
<tr class="row-odd"><td>29 409</td>
<td>-150.022 2(2)</td>
<td>-149.758 3(2)</td>
<td>7.18</td>
</tr>
<tr class="row-even"><td>168 595</td>
<td>-150.019 9(1)</td>
<td>-149.754 5(1)</td>
<td>7.22</td>
</tr>
<tr class="row-odd"><td>1 322 537</td>
<td>-150.017 89(7)</td>
<td>-149.752 55(7)</td>
<td>7.22</td>
</tr>
<tr class="row-even"><td>8 495 334</td>
<td>-150.015 97(4)</td>
<td>-149.750 87(5)</td>
<td>7.21</td>
</tr>
<tr class="row-odd"><td>9 356 952</td>
<td>-150.015 89(3)</td>
<td>-149.750 66(3)</td>
<td>7.22</td>
</tr>
<tr class="row-even"><td>42 959 496</td>
<td>-150.016 75(2)</td>
<td>-149.751 88(2)</td>
<td>7.21</td>
</tr>
<tr class="row-odd"><td>186 978 487</td>
<td>-150.017 51(2)</td>
<td>-149.752 90(2)</td>
<td>7.20</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="section" id="davidson-s-diagonalization">
<h2>Davidsons diagonalization<a class="headerlink" href="#davidson-s-diagonalization" title="Permalink to this headline"></a></h2>
<p>We present the parallel speedup curve, and the wall-clock time in seconds
required to compute one iteration for two wave functions measured on Olympe
and Irene.</p>
<div class="figure" id="id6">
<img alt="Parallel speedup of Davidson's diagonalization." src="../_images/speedup_davidson.png" />
<p class="caption"><span class="caption-text">Parallel speedup of Davidsons diagonalization measured on Olympe and Irene.</span></p>
</div>
<div class="section" id="olympe">
<h3>Olympe<a class="headerlink" href="#olympe" title="Permalink to this headline"></a></h3>
<table border="1" class="docutils">
<colgroup>
<col width="34%" />
<col width="32%" />
<col width="34%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Number of 36-core Nodes</th>
<th class="head">9 356 952 determinants</th>
<th class="head">42 959 496 determinants</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>1</td>
<td>775.55</td>
<td>11 198.70</td>
</tr>
<tr class="row-odd"><td>5</td>
<td>169.88</td>
<td>2 288.58</td>
</tr>
<tr class="row-even"><td>10</td>
<td>93.22</td>
<td>1 213.95</td>
</tr>
<tr class="row-odd"><td>20</td>
<td>56.86</td>
<td>626.41</td>
</tr>
<tr class="row-even"><td>30</td>
<td>43.76</td>
<td>445.65</td>
</tr>
<tr class="row-odd"><td>40</td>
<td>36.18</td>
<td>350.25</td>
</tr>
<tr class="row-even"><td>50</td>
<td>33.67</td>
<td>295.25</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="irene">
<h3>Irene<a class="headerlink" href="#irene" title="Permalink to this headline"></a></h3>
<table border="1" class="docutils">
<colgroup>
<col width="34%" />
<col width="32%" />
<col width="34%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Number of 48-core Nodes</th>
<th class="head">9 356 952 determinants</th>
<th class="head">42 959 496 determinants</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>1</td>
<td>572.98</td>
<td>9 154.30 *</td>
</tr>
<tr class="row-odd"><td>10</td>
<td>72.55</td>
<td>922.07</td>
</tr>
<tr class="row-even"><td>25</td>
<td>38.88</td>
<td>412.34</td>
</tr>
<tr class="row-odd"><td>50</td>
<td>27.95</td>
<td>241.35</td>
</tr>
<tr class="row-even"><td>75</td>
<td>27.54</td>
<td>183.63</td>
</tr>
<tr class="row-odd"><td>100</td>
<td>27.86</td>
<td>165.68</td>
</tr>
<tr class="row-even"><td>150</td>
<td>28.14</td>
<td>134.05</td>
</tr>
<tr class="row-odd"><td>200</td>
<td>27.77</td>
<td>134.64</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="section" id="pt2-correction">
<h2>PT2 correction<a class="headerlink" href="#pt2-correction" title="Permalink to this headline"></a></h2>
<p>We present the parallel speedup curve, and the wall-clock time in seconds
required to compute the PT2 correction for two wave functions measured on
Olympe and Irene.</p>
<div class="figure" id="id7">
<img alt="Parallel speedup of the PT2 computation of the ground state." src="../_images/speedup_pt2.png" />
<p class="caption"><span class="caption-text">Parallel speedup of the PT2 computation of the ground state measured
on Olympe and Irene.</span></p>
</div>
<div class="section" id="id1">
<h3>Olympe<a class="headerlink" href="#id1" title="Permalink to this headline"></a></h3>
<table border="1" class="docutils">
<colgroup>
<col width="34%" />
<col width="32%" />
<col width="34%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Number of 36-core Nodes</th>
<th class="head">Ground state (9.3M)</th>
<th class="head">Excited state (9.3M)</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>1</td>
<td>7 883.74</td>
<td>9 829.19</td>
</tr>
<tr class="row-odd"><td>5</td>
<td>1 629.06</td>
<td>2 022.36</td>
</tr>
<tr class="row-even"><td>10</td>
<td>832.89</td>
<td>1 029.91</td>
</tr>
<tr class="row-odd"><td>20</td>
<td>440.76</td>
<td>537.37</td>
</tr>
<tr class="row-even"><td>30</td>
<td>303.31</td>
<td>378.69</td>
</tr>
<tr class="row-odd"><td>40</td>
<td>246.12</td>
<td>296.31</td>
</tr>
<tr class="row-even"><td>50</td>
<td>201.84</td>
<td>241.55</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="id2">
<h3>Irene<a class="headerlink" href="#id2" title="Permalink to this headline"></a></h3>
<table border="1" class="docutils">
<colgroup>
<col width="20%" />
<col width="19%" />
<col width="20%" />
<col width="19%" />
<col width="20%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Number of 48-core Nodes</th>
<th class="head">Ground state (9.3M)</th>
<th class="head">Excited state (9.3M)</th>
<th class="head">Ground state (42.9M)</th>
<th class="head">Excited state (42.9M)</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>1</td>
<td>4 935.81</td>
<td>6 152.29</td>
<td>24 586.62</td>
<td>37 440.59</td>
</tr>
<tr class="row-odd"><td>10</td>
<td>525.95</td>
<td>652.23</td>
<td>2 458.66</td>
<td>3 086.19</td>
</tr>
<tr class="row-even"><td>25</td>
<td>237.47</td>
<td>286.06</td>
<td>1 041.69</td>
<td>1 295.43</td>
</tr>
<tr class="row-odd"><td>50</td>
<td>144.39</td>
<td>174.12</td>
<td>588.35</td>
<td>724.25</td>
</tr>
<tr class="row-even"><td>75</td>
<td>109.13</td>
<td>129.17</td>
<td>446.74</td>
<td>537.59</td>
</tr>
<tr class="row-odd"><td>100</td>
<td>100.75</td>
<td>103.43</td>
<td>367.21</td>
<td>450.32</td>
</tr>
<tr class="row-even"><td>150</td>
<td>82.04</td>
<td>91.77</td>
<td>298.63</td>
<td>358.25</td>
</tr>
<tr class="row-odd"><td>200</td>
<td>75.62</td>
<td>85.25</td>
<td>268.96</td>
<td>312.23</td>
</tr>
</tbody>
</table>
</div>
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