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<div id="projectbrief">Simulate the change in energy and magnetization in a ferro magnet</div>
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<div class="headertitle"><div class="title">Ising Model </div></div>
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<div class="contents">
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<div class="textblock"><p><a class="anchor" id="md_README"></a> <a href="https://github.uio.no/FYS3150-G2-2023/Project-4">Repo</a></p>
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<p><a href="https://pages.github.uio.no/FYS3150-G2-2023/Project-4/">Documentation</a></p>
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<h1><a class="anchor" id="autotoc_md1"></a>
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Requirements</h1>
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<h2><a class="anchor" id="autotoc_md2"></a>
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Operating systems</h2>
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<ul>
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<li>Linux<ul>
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<li>Has been tested on <a href="https://fedoraproject.org/">Fedora 38</a></li>
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<li>Will most likely work on other Linux distributions</li>
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</ul>
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</li>
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<li>MacOS<ul>
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<li>Might work, but hasn't been tested</li>
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</ul>
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</li>
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<li>Windows<ul>
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<li>Will most likely not work</li>
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</ul>
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</li>
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</ul>
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<h2><a class="anchor" id="autotoc_md3"></a>
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Tools</h2>
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<ul>
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<li>Profiling<ul>
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<li><a href="https://www.vi-hps.org/projects/score-p">score-p</a></li>
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</ul>
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</li>
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</ul>
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<h2><a class="anchor" id="autotoc_md4"></a>
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Libraries</h2>
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<ul>
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<li>Python<ul>
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<li><a href="https://matplotlib.org/">matplotlib</a></li>
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<li><a href="https://numpy.org/">numpy</a></li>
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</ul>
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</li>
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<li>C++<ul>
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<li><a href="https://www.openmp.org/">Openmp</a></li>
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<li><a href="https://www.open-mpi.org/">OpenMPI</a></li>
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<li><a href="https://arma.sourceforge.net/">Armadillo</a></li>
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</ul>
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</li>
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</ul>
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<h1><a class="anchor" id="autotoc_md5"></a>
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Compiling</h1>
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<p>The commands shown here should be run from the root of this project.</p>
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<h2><a class="anchor" id="autotoc_md6"></a>
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Normal binaries</h2>
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<p>Compiling regular binaries is as easy as running this command:</p>
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<div class="fragment"><div class="line">make</div>
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</div><!-- fragment --><p>The binaries will then be inside the **./bin** directory.</p>
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<h2><a class="anchor" id="autotoc_md7"></a>
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Profiling binaries</h2>
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<p>If you want to profile the programs (specifically the MPI program), then run this command</p>
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<div class="fragment"><div class="line">make profile</div>
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</div><!-- fragment --><p>The binaries will then be inside the **./prof** directory.</p>
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<h2><a class="anchor" id="autotoc_md8"></a>
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Debugging binaries</h2>
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<p>If you want to debug the code, then use this command:</p>
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<div class="fragment"><div class="line">make debug</div>
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</div><!-- fragment --><p>The binaries will then be inside the **./debug** directory.</p>
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<h1><a class="anchor" id="autotoc_md9"></a>
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Running programs</h1>
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<h2><a class="anchor" id="autotoc_md10"></a>
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C++ binaries</h2>
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<p>To run any of the programs, just use the following command:</p>
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<div class="fragment"><div class="line">./<bin|prof|debug>/<program-name> <args></div>
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</div><!-- fragment --><p>If you need help with any of the programs, you can use the <b>-h</b> or <b>–help</b> flag to show you how to use the programs. Here is an example:</p>
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<div class="fragment"><div class="line">./bin/main --help</div>
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</div><!-- fragment --><h2><a class="anchor" id="autotoc_md11"></a>
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Python scripts</h2>
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<h3><a class="anchor" id="autotoc_md12"></a>
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Install libraries</h3>
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<p>Before running the scripts, make sure that all libraries are installed. Using pip, you can install all requirements like this:</p>
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<div class="fragment"><div class="line">pip install -r requirements.txt</div>
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</div><!-- fragment --><p>This recursively install all the packages that are listed in <b>requirements.txt</b>.</p>
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<h3><a class="anchor" id="autotoc_md13"></a>
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Running scripts</h3>
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<p>For the Python scripts, run them from the root of the project:</p>
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<div class="fragment"><div class="line">python python_scripts/<script-name></div>
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</div><!-- fragment --><p>If you have any problems running the scripts, you might have to run this instead:</p>
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<div class="fragment"><div class="line">python3 python_scripts/<script-name></div>
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</div><!-- fragment --><h2><a class="anchor" id="autotoc_md14"></a>
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Batch system</h2>
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<p>For the <b>phase_transition_mpi</b> program, there are scripts in the **./slurm_scripts** directory that come along with it. This is to be able to run it on a batch system using Slurm if you have access to one. The only program that should be executed by the user is the **./slurm_scripts/execute.script** script. You can see how to use this script by doing:</p>
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<div class="fragment"><div class="line">./slurm_scripts/execute.script --help</div>
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</div><!-- fragment --><p>This is the recommended way to use this program as it takes approximately 90 minutes to complete when using 8 processes where each process has 10 threads.</p>
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<p>If you happen to have such a system available to you, then you should clone this repo on that system, then compile the MPI program like this:</p>
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<div class="fragment"><div class="line">make bin/phase_transition_mpi</div>
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</div><!-- fragment --><p>After compiling, you can schedule it by using the **./slurm_scripts/execute.script**:</p>
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<div class="fragment"><div class="line">./slurm_scripts/execute.script <parameters></div>
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</div><!-- fragment --><h1><a class="anchor" id="autotoc_md15"></a>
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Performance</h1>
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<p>This section aims to give an idea to the time it takes for the phase transition program to run so that you know a bit what to expect if you decide to run it for yourself.</p>
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<h2><a class="anchor" id="autotoc_md16"></a>
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CPU</h2>
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<p>The times mentioned here are times achieved on a computer with these specifications:</p>
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<ul>
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<li>CPU model<ul>
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<li>Intel i7-9850H</li>
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</ul>
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</li>
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<li>Threads<ul>
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<li>12</li>
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</ul>
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</li>
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<li>Clock speed<ul>
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<li>4.6GHz</li>
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</ul>
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</li>
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</ul>
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<h2><a class="anchor" id="autotoc_md17"></a>
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Times</h2>
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<p>Note that all times here are recorded using the OpenMP implementation of the MCMC algorithm.</p>
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<table class="markdownTable">
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<tr class="markdownTableHead">
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<th class="markdownTableHeadNone">lattice size </th><th class="markdownTableHeadNone">points </th><th class="markdownTableHeadNone">samples </th><th class="markdownTableHeadNone">burn-in time </th><th class="markdownTableHeadNone">time (seconds) </th></tr>
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<tr class="markdownTableRowOdd">
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<td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">100000 </td><td class="markdownTableBodyNone">0 </td><td class="markdownTableBodyNone">3.20 </td></tr>
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<tr class="markdownTableRowEven">
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<td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">40 </td><td class="markdownTableBodyNone">100000 </td><td class="markdownTableBodyNone">0 </td><td class="markdownTableBodyNone">6.17 </td></tr>
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<tr class="markdownTableRowOdd">
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<td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">80 </td><td class="markdownTableBodyNone">100000 </td><td class="markdownTableBodyNone">0 </td><td class="markdownTableBodyNone">12.11 </td></tr>
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</table>
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<table class="markdownTable">
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<tr class="markdownTableHead">
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<th class="markdownTableHeadNone">lattice size </th><th class="markdownTableHeadNone">points </th><th class="markdownTableHeadNone">samples </th><th class="markdownTableHeadNone">burn-in time </th><th class="markdownTableHeadNone">time (seconds) </th></tr>
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<tr class="markdownTableRowOdd">
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<td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">100000 </td><td class="markdownTableBodyNone">0 </td><td class="markdownTableBodyNone">3.20 </td></tr>
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<tr class="markdownTableRowEven">
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<td class="markdownTableBodyNone">40 </td><td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">100000 </td><td class="markdownTableBodyNone">0 </td><td class="markdownTableBodyNone">11.91 </td></tr>
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<tr class="markdownTableRowOdd">
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<td class="markdownTableBodyNone">80 </td><td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">100000 </td><td class="markdownTableBodyNone">0 </td><td class="markdownTableBodyNone">47.88 </td></tr>
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</table>
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<table class="markdownTable">
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<tr class="markdownTableHead">
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<th class="markdownTableHeadNone">lattice size </th><th class="markdownTableHeadNone">points </th><th class="markdownTableHeadNone">samples </th><th class="markdownTableHeadNone">burn-in time </th><th class="markdownTableHeadNone">time (seconds) </th></tr>
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<tr class="markdownTableRowOdd">
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<td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">100000 </td><td class="markdownTableBodyNone">0 </td><td class="markdownTableBodyNone">3.20 </td></tr>
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<tr class="markdownTableRowEven">
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<td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">1000000 </td><td class="markdownTableBodyNone">0 </td><td class="markdownTableBodyNone">29.95 </td></tr>
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<tr class="markdownTableRowOdd">
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<td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">10000000 </td><td class="markdownTableBodyNone">0 </td><td class="markdownTableBodyNone">305.849 </td></tr>
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</table>
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<table class="markdownTable">
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<tr class="markdownTableHead">
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<th class="markdownTableHeadNone">lattice size </th><th class="markdownTableHeadNone">points </th><th class="markdownTableHeadNone">samples </th><th class="markdownTableHeadNone">burn-in time </th><th class="markdownTableHeadNone">time (seconds) </th></tr>
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<tr class="markdownTableRowOdd">
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<td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">100000 </td><td class="markdownTableBodyNone">0 </td><td class="markdownTableBodyNone">3.20 </td></tr>
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<tr class="markdownTableRowEven">
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<td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">100000 </td><td class="markdownTableBodyNone">5000 </td><td class="markdownTableBodyNone">4.93 </td></tr>
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<tr class="markdownTableRowOdd">
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<td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">20 </td><td class="markdownTableBodyNone">100000 </td><td class="markdownTableBodyNone">10000 </td><td class="markdownTableBodyNone">6.58 </td></tr>
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</table>
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<p>We can see that changing the number of points, samples and burn-in time changes the time in a linear fashion, while changing the size of the lattice changes the time in a square fashion.</p>
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<h1><a class="anchor" id="autotoc_md18"></a>
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Credits</h1>
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