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<section id="work-flows-algorithm-profiling">
<span id="algorithmprofiler"></span><h1>Work flows algorithm profiling<a class="headerlink" href="#work-flows-algorithm-profiling" title="Link to this heading">#</a></h1>
<nav class="contents local" id="contents">
<p class="topic-title">Contents</p>
<ul class="simple">
<li><p><a class="reference internal" href="#summary" id="id1">Summary</a></p></li>
<li><p><a class="reference internal" href="#mantid-build" id="id2">Mantid build</a></p></li>
<li><p><a class="reference internal" href="#adding-more-detailed-information" id="id3">Adding more detailed information</a></p></li>
<li><p><a class="reference internal" href="#analysing-tool" id="id4">Analysing tool</a></p></li>
<li><p><a class="reference internal" href="#related-documentation" id="id5">Related Documentation</a></p></li>
</ul>
</nav>
<figure class="align-default">
<img alt="Example output after rendering" src="_images/MantidProfiler.png" />
</figure>
<section id="summary">
<h2><a class="toc-backref" href="#id1" role="doc-backlink">Summary</a><a class="headerlink" href="#summary" title="Link to this heading">#</a></h2>
<p>Due to the need of investigation of algorithms performance issues, the proper method is introduced.
It consists two to parts: special mantid build and analytical tool.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Available for Linux only.</p>
</div>
</section>
<section id="mantid-build">
<h2><a class="toc-backref" href="#id2" role="doc-backlink">Mantid build</a><a class="headerlink" href="#mantid-build" title="Link to this heading">#</a></h2>
<p>On linux the profiler is built by default but to enable profiling, the <a class="reference external" href="https://docs.mantidproject.org/nightly/concepts/PropertiesFile.html#algorithm-profiling" title="(in MantidProject v6.15)"><span class="xref std std-ref">properties</span></a> must be set.
Enabling the profiler will create a file that contains the time stamps for start and finish of executed algorithms with ~nanosecond precision in a very simple text format.</p>
</section>
<section id="adding-more-detailed-information">
<h2><a class="toc-backref" href="#id3" role="doc-backlink">Adding more detailed information</a><a class="headerlink" href="#adding-more-detailed-information" title="Link to this heading">#</a></h2>
<p>More detailed information can be added to individual function calls in C++ with the help of <code class="docutils literal notranslate"><span class="pre">std::chrono</span></code>.
At the top of the function create a “start time”</p>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="k">const</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">startTime</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">chrono</span><span class="o">::</span><span class="n">high_resolution_clock</span><span class="o">::</span><span class="n">now</span><span class="p">();</span>
</pre></div>
</div>
<p>Then at the bottom of the section being timed, add it to the profiling output</p>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="n">addTimer</span><span class="p">(</span><span class="s">"createOutputWorkspacesSplitters"</span><span class="p">,</span><span class="w"> </span><span class="n">startTime</span><span class="p">,</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">chrono</span><span class="o">::</span><span class="n">high_resolution_clock</span><span class="o">::</span><span class="n">now</span><span class="p">());</span>
</pre></div>
</div>
<p>where <code class="docutils literal notranslate"><span class="pre">createOutputWorkspacesSplitters</span></code> is the name that will appear, similar to a child algorithm.
The names in the report will be suffixed with <code class="docutils literal notranslate"><span class="pre">1</span></code> because the tool thinks they are the “default version” of a child algorithm.</p>
<p>An example of this can be found in <a class="reference external" href="https://github.com/mantidproject/mantid/blob/main/Framework/Algorithms/src/FilterEvents.cpp">FilterEvents.cpp</a>.</p>
</section>
<section id="analysing-tool">
<h2><a class="toc-backref" href="#id4" role="doc-backlink">Analysing tool</a><a class="headerlink" href="#analysing-tool" title="Link to this heading">#</a></h2>
<p>The <a class="reference external" href="https://github.com/mantidproject/mantid-profiler">mantid-profiler project</a> provides the nice graphical tool to interpret the information contained in the dumped file.
The project has more detiled instructions, but in general</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>python<span class="w"> </span>path/to/myscript.py<span class="w"> </span><span class="p">&</span><span class="w"> </span>mantidprofiler<span class="w"> </span><span class="nv">$!</span>
</pre></div>
</div>
<p>The <code class="docutils literal notranslate"><span class="pre">&</span></code> puts the python process in the background.
The <code class="docutils literal notranslate"><span class="pre">$!</span></code> is the process-id (PID) of the last process run and allows mantid-profiler to attach to the process.</p>
</section>
<section id="related-documentation">
<h2><a class="toc-backref" href="#id5" role="doc-backlink">Related Documentation</a><a class="headerlink" href="#related-documentation" title="Link to this heading">#</a></h2>
<ul class="simple">
<li><p><a class="reference external" href="https://docs.mantidproject.org/api/python/mantid/api/AlgoTimeRegister.html">mantid.api.AlgoTimeRegister</a> discusses how timing is measured.</p></li>
<li><p><a class="reference external" href="https://github.com/mantidproject/mantid-profiler">The mantid-profiler README</a> provides an overview of how to tool is used.</p></li>
<li><p><a class="reference external" href="https://docs.mantidproject.org/concepts/PropertiesFile.html#algorithm-profiling-settings">Relevant properties file configurations</a>.</p></li>
</ul>
</section>
</section>
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