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<section id="geopm-agg-3-data-aggregation-functions">
<h1>geopm::Agg(3) – data aggregation functions<a class="headerlink" href="#geopm-agg-3-data-aggregation-functions" title="Permalink to this heading"></a></h1>
<section id="namespaces">
<h2>Namespaces<a class="headerlink" href="#namespaces" title="Permalink to this heading"></a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">Agg</span></code> class and the <code class="docutils literal notranslate"><span class="pre">Agg::m_type_e</span></code> struct are members of
the <code class="docutils literal notranslate"><span class="pre">namespace</span> <span class="pre">geopm</span></code>, but the full names, <code class="docutils literal notranslate"><span class="pre">geopm::Agg</span></code> and
<code class="docutils literal notranslate"><span class="pre">geopm::Agg::m_type_e</span></code>, have been abbreviated in this manual.
Similarly, the <code class="docutils literal notranslate"><span class="pre">std::</span></code> namespace specifier has been omitted from the
interface definitions for the following standard types: <code class="docutils literal notranslate"><span class="pre">std::vector</span></code>,
<code class="docutils literal notranslate"><span class="pre">std::pair</span></code>, <code class="docutils literal notranslate"><span class="pre">std::string</span></code>, <code class="docutils literal notranslate"><span class="pre">std::map</span></code>, and <code class="docutils literal notranslate"><span class="pre">std::function</span></code>, to enable
better rendering of this manual.</p>
</section>
<section id="synopsis">
<h2>Synopsis<a class="headerlink" href="#synopsis" title="Permalink to this heading"></a></h2>
<p>#include <a class="reference external" href="https://github.com/geopm/geopm/blob/dev/service/src/geopm/Agg.hpp"><geopm/Agg.hpp></a></p>
<p>Link with <code class="docutils literal notranslate"><span class="pre">-lgeopm</span></code> <strong>(MPI)</strong> or <code class="docutils literal notranslate"><span class="pre">-lgeopm</span></code> <strong>(non-MPI)</strong></p>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="k">static</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="nf">Agg::sum</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">operands</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="nf">Agg::average</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">operands</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="nf">Agg::median</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">operands</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="nf">Agg::logical_and</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">operands</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="nf">Agg::logical_or</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">operands</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="nf">Agg::min</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">operands</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="nf">Agg::max</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">operands</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="nf">Agg::stddev</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">operands</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="nf">Agg::region_hash</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">operands</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="nf">Agg::region_hint</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">operands</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="nf">Agg::select_first</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">operands</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="nf">Agg::expect_same</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">operands</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="n">function</span><span class="o"><</span><span class="kt">double</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="p">)</span><span class="o">></span><span class="w"> </span><span class="n">Agg</span><span class="o">::</span><span class="n">name_to_function</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">name</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="nf">Agg::function_to_name</span><span class="p">(</span><span class="n">function</span><span class="o"><</span><span class="kt">double</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="p">)</span><span class="o">></span><span class="w"> </span><span class="n">func</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="nf">Agg::function_to_type</span><span class="p">(</span><span class="n">function</span><span class="o"><</span><span class="kt">double</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="p">)</span><span class="o">></span><span class="w"> </span><span class="n">func</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="n">function</span><span class="o"><</span><span class="kt">double</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="p">)</span><span class="o">></span><span class="w"> </span><span class="n">Agg</span><span class="o">::</span><span class="n">type_to_function</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">agg_type</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="nf">Agg::type_to_name</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">agg_type</span><span class="p">);</span>
</pre></div>
</div>
</section>
<section id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this heading"></a></h2>
<p>This class contains helper functions for aggregating multiple
floating-point samples to a single number. They can be used to
simplify Agent implementation.</p>
</section>
<section id="enum-type">
<h2>Enum Type<a class="headerlink" href="#enum-type" title="Permalink to this heading"></a></h2>
<p>Each of the following enum values corresponds to each of the aggregation helper functions.</p>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="k">enum</span><span class="w"> </span><span class="nc">Agg</span><span class="o">::</span><span class="n">m_type_e</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">M_SUM</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_AVERAGE</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_MEDIAN</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_LOGICAL_AND</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_LOGICAL_OR</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_MIN</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_MAX</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_STDDEV</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_REGION_HASH</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_REGION_HINT</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_SELECT_FIRST</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_EXPECT_SAME</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_NUM_TYPE</span>
<span class="p">};</span>
</pre></div>
</div>
</section>
<section id="class-methods">
<h2>Class Methods<a class="headerlink" href="#class-methods" title="Permalink to this heading"></a></h2>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">sum()</span></code>:
Returns the sum of the input <em>operands</em>.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">average()</span></code>:
Returns the average of the input <em>operands</em>.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">median()</span></code>:
Returns the median of the input <em>operands</em>.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">logical_and()</span></code>:
Returns the output of logical AND over all the <em>operands</em> where
<code class="docutils literal notranslate"><span class="pre">0.0</span></code> is false and all other values are true.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">logical_or()</span></code>:
Returns the output of logical OR over all the <em>operands</em> where
<code class="docutils literal notranslate"><span class="pre">0.0</span></code> is false and all other values are true.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">min()</span></code>:
Returns the minimum value from the input <em>operands</em>.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">max()</span></code>:
Returns the maximum value from the input <em>operands</em>.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">stddev()</span></code>:
Returns the standard deviation of the input <em>operands</em>.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">region_hash()</span></code>:
If all <em>operands</em> are the same, returns the common value.
Otherwise, returns <code class="docutils literal notranslate"><span class="pre">GEOPM_REGION_HASH_UNMARKED</span></code>. This is intended for
situations where all ranks in a domain must be in the same region
to exert control for that region.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">region_hint()</span></code>:
If all <em>operands</em> are the same, returns the common value.
Otherwise, returns <code class="docutils literal notranslate"><span class="pre">GEOPM_REGION_HINT_UNKNOWN</span></code>. This is intended for
situations where all ranks in a domain must be in the same region
to exert control for that region.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">select_first()</span></code>:
Returns the first value in the <em>operands</em> vector and ignores other
values. If the vector is empty, returns <code class="docutils literal notranslate"><span class="pre">0.0</span></code>.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">expect_same()</span></code>:
Returns the common value if all <em>operands</em> are the same, or NAN
otherwise. This function should not be used to aggregate values
that may be interpreted as NAN such as raw register values or region
IDs.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">name_to_function()</span></code>:
Returns the corresponding agg function for a
given <code class="docutils literal notranslate"><span class="pre">string</span></code> <em>name</em>. If the <em>name</em> does not match
a known function, it throws an error.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">function_to_name()</span></code>:
Returns the corresponding agg function name for a
given <code class="docutils literal notranslate"><span class="pre">std::function</span></code>. If the <code class="docutils literal notranslate"><span class="pre">std::function</span></code> does not match
a known function, it throws an error.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">function_to_type()</span></code>:
Returns the corresponding agg function type for a
given <code class="docutils literal notranslate"><span class="pre">std::function</span></code>. If the <code class="docutils literal notranslate"><span class="pre">std::function</span></code> does not match
a known function, it throws an error.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">type_to_function()</span></code>:
Returns the corresponding agg function for one
of the <code class="docutils literal notranslate"><span class="pre">Agg::m_type_e</span></code> enum values. If the
<em>agg_type</em> is out of range, it throws an error.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">type_to_name()</span></code>:
Returns the corresponding agg function name for
one of the <code class="docutils literal notranslate"><span class="pre">Agg:m_type_e</span></code> enum values. If the
<em>agg_type</em> is out of range, it throws an error.</p></li>
</ul>
</section>
<section id="see-also">
<h2>See Also<a class="headerlink" href="#see-also" title="Permalink to this heading"></a></h2>
<p><a class="reference internal" href="geopm.7.html"><span class="doc">geopm(7)</span></a>,
<a class="reference internal" href="geopm_hash.3.html"><span class="doc">geopm_hash(3)</span></a></p>
</section>
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