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<section id="geopm-timeiogroup-3-iogroup-providing-time-signals">
<h1>geopm::TimeIOGroup(3) – IOGroup providing time signals<a class="headerlink" href="#geopm-timeiogroup-3-iogroup-providing-time-signals" title="Link to this heading"></a></h1>
<section id="namespaces">
<h2>Namespaces<a class="headerlink" href="#namespaces" title="Link to this heading"></a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">TimeIOGroup</span></code> class and the <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> class 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::TimeIOGroup</span></code> and <code class="docutils literal notranslate"><span class="pre">geopm::IOGroup</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::string</span></code>, <code class="docutils literal notranslate"><span class="pre">std::set</span></code>, <code class="docutils literal notranslate"><span class="pre">std::unique_ptr</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="Link to this heading"></a></h2>
<p>#include <a class="reference external" href="https://github.com/geopm/geopm/blob/dev/libgeopmd/include/TimeIOGroup.hpp"><geopm/TimeIOGroup.hpp></a></p>
<p>Link with <code class="docutils literal notranslate"><span class="pre">-lgeopmd</span></code></p>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="n">set</span><span class="o"><</span><span class="n">string</span><span class="o">></span><span class="w"> </span><span class="n">TimeIOGroup</span><span class="o">::</span><span class="n">signal_names</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="n">set</span><span class="o"><</span><span class="n">string</span><span class="o">></span><span class="w"> </span><span class="n">TimeIOGroup</span><span class="o">::</span><span class="n">control_names</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">bool</span><span class="w"> </span><span class="nf">TimeIOGroup::is_valid_signal</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">signal_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">bool</span><span class="w"> </span><span class="nf">TimeIOGroup::is_valid_control</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">control_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">TimeIOGroup::signal_domain_type</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">signal_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">TimeIOGroup::control_domain_type</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">control_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">TimeIOGroup::push_signal</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">signal_name</span><span class="p">,</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">domain_type</span><span class="p">,</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">domain_idx</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">TimeIOGroup::push_control</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">control_name</span><span class="p">,</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">domain_type</span><span class="p">,</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">domain_idx</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">TimeIOGroup::read_batch</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">TimeIOGroup::write_batch</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">double</span><span class="w"> </span><span class="nf">TimeIOGroup::sample</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">batch_idx</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">TimeIOGroup::adjust</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">batch_idx</span><span class="p">,</span>
<span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="n">setting</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">double</span><span class="w"> </span><span class="nf">TimeIOGroup::read_signal</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">signal_name</span><span class="p">,</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">domain_type</span><span class="p">,</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">domain_idx</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">TimeIOGroup::write_control</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">control_name</span><span class="p">,</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">domain_type</span><span class="p">,</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">domain_idx</span><span class="p">,</span>
<span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="n">setting</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">TimeIOGroup::save_control</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">TimeIOGroup::restore_control</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">override</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">TimeIOGroup</span><span class="o">::</span><span class="n">agg_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">signal_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="n">function</span><span class="o"><</span><span class="n">string</span><span class="p">(</span><span class="kt">double</span><span class="p">)</span><span class="o">></span><span class="w"> </span><span class="n">TimeIOGroup</span><span class="o">::</span><span class="n">format_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">signal_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="n">string</span><span class="w"> </span><span class="nf">TimeIOGroup::signal_description</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">signal_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="n">string</span><span class="w"> </span><span class="nf">TimeIOGroup::control_description</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">control_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">TimeIOGroup::signal_behavior</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">signal_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">TimeIOGroup::save_control</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">save_path</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">TimeIOGroup::restore_control</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">save_path</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="n">string</span><span class="w"> </span><span class="nf">TimeIOGroup::name</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</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">TimeIOGroup::plugin_name</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="n">unique_ptr</span><span class="o"><</span><span class="n">IOGroup</span><span class="o">></span><span class="w"> </span><span class="n">TimeIOGroup</span><span class="o">::</span><span class="n">make_plugin</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span>
</pre></div>
</div>
</section>
<section id="description">
<h2>Description<a class="headerlink" href="#description" title="Link to this heading"></a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">TimeIOGroup</span></code> class is a derived implementation of <a class="reference internal" href="geopm%3A%3AIOGroup.3.html"><span class="doc">geopm::IOGroup(3)</span></a>
that provides an implementation of the <code class="docutils literal notranslate"><span class="pre">TIME</span></code> signal for the time since GEOPM startup.</p>
</section>
<section id="class-methods">
<h2>Class Methods<a class="headerlink" href="#class-methods" title="Link to this heading"></a></h2>
<dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">signal_names()</span></code></dt><dd><p>Returns the time signal name, <code class="docutils literal notranslate"><span class="pre">"TIME::ELAPSED"</span></code>, and its alias, <code class="docutils literal notranslate"><span class="pre">"TIME"</span></code>.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">control_names()</span></code></dt><dd><p>Does nothing; this <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> does not provide any controls.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">is_valid_signal()</span></code></dt><dd><p>Returns <code class="docutils literal notranslate"><span class="pre">true</span></code> if the <em>signal_name</em> is one from the list returned by
<code class="docutils literal notranslate"><span class="pre">signal_names()</span></code>.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">is_valid_control()</span></code></dt><dd><p>Returns <code class="docutils literal notranslate"><span class="pre">false</span></code>; this <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> does not provide any controls.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">signal_domain_type()</span></code></dt><dd><p>If the <em>signal_name</em> is valid for this <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code>, returns
<code class="docutils literal notranslate"><span class="pre">GEOPM_DOMAIN_CPU</span></code>, returns <code class="docutils literal notranslate"><span class="pre">GEOPM_DOMAIN_INVALID</span></code>.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">control_domain_type()</span></code></dt><dd><p>Returns <code class="docutils literal notranslate"><span class="pre">GEOPM_DOMAIN_INVALID</span></code>; this <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> does not provide any controls.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">push_signal()</span></code></dt><dd><p>Since this <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> only provides one signal, returns <code class="docutils literal notranslate"><span class="pre">0</span></code> if the <em>signal_name</em>
is valid. Throws a variety of exceptions if the parameters do not check out.
The <em>domain_idx</em> parameter is ignored.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">push_control()</span></code></dt><dd><p>Should not be called; this <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> does not provide any controls.
Throws an exception always.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">read_batch()</span></code></dt><dd><p>If a time signal has been pushed, updates the time since the
<code class="docutils literal notranslate"><span class="pre">TimeIOGroup</span></code> was created.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">write_batch()</span></code></dt><dd><p>Does nothing; this <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> does not provide any controls.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">sample()</span></code></dt><dd><p>Returns the value of the signal specified by a <em>batch_idx</em>
returned from <code class="docutils literal notranslate"><span class="pre">push_signal()</span></code>. The value will have been updated by
the most recent call to <code class="docutils literal notranslate"><span class="pre">read_batch()</span></code>.
Throws a variety of exceptions to distinguish between error conditions.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">adjust()</span></code></dt><dd><p>Should not be called; this <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> does not provide any controls.
Throws an exception always.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">read_signal()</span></code></dt><dd><p>If <em>signal_name</em> is valid, immediately return the time since the
<code class="docutils literal notranslate"><span class="pre">TimeIOGroup</span></code> was created.
Throws a variety of exceptions if the parameters do not check out.
The <em>domain_idx</em> parameter is ignored.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">write_control()</span></code></dt><dd><p>Should not be called; this <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> does not provide any controls.
Throws an exception always.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">save_control()</span></code></dt><dd><p>This function also has an overload form that takes the <em>save_path</em> parameter.
Does nothing in both of its forms; this <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> does not provide any controls.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">restore_control()</span></code></dt><dd><p>This function also has an overload form that takes the <em>save_path</em> parameter.
Does nothing in both of its forms; this <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> does not provide any controls.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">agg_function()</span></code></dt><dd><p>The <code class="docutils literal notranslate"><span class="pre">TIME</span></code> signal provided by this <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> is aggregated using the
<code class="docutils literal notranslate"><span class="pre">average()</span></code> function from <a class="reference internal" href="geopm%3A%3AAgg.3.html"><span class="doc">geopm::Agg(3)</span></a>.
Throws an exception if the <em>signal_name</em> is invalid.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">format_function()</span></code></dt><dd><p>Returns a function which formats a string to best represent a signal encoding a
double precision floating point number. The function takes the <em>signal</em>,
a real number that requires a few significant digits to accurately represent.
The function returns a well formatted string representation of the signal.
Throws an exception if the <em>signal_name</em> is invalid.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">signal_description()</span></code></dt><dd><p>Returns a string description for <em>signal_name</em>, if defined.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">control_description()</span></code></dt><dd><p>Should not be called; this <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> does not provide any controls.
Throws an exception always.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">signal_behavior()</span></code></dt><dd><p>Returns one of the <code class="docutils literal notranslate"><span class="pre">IOGroup::signal_behavior_e</span></code> values which
describes about how a signal will change as a function of time.
This can be used when generating reports to decide how to
summarize a signal’s value for the entire application run.
Throws an exception if the <em>signal_name</em> is invalid.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">name()</span></code></dt><dd><p>Just calls <code class="docutils literal notranslate"><span class="pre">plugin_name()</span></code> under the hood.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">plugin_name()</span></code></dt><dd><p>Returns the name of the plugin to use when this plugin is
registered with the <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> factory; see
<a class="reference internal" href="geopm%3A%3APluginFactory.3.html"><span class="doc">geopm::PluginFactory(3)</span></a> for more details.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">make_plugin()</span></code></dt><dd><p>Returns a pointer to a new <code class="docutils literal notranslate"><span class="pre">TimeIOGroup</span></code> object; see
<a class="reference internal" href="geopm%3A%3APluginFactory.3.html"><span class="doc">geopm::PluginFactory(3)</span></a> for more details.</p>
</dd>
</dl>
</section>
<section id="see-also">
<h2>See Also<a class="headerlink" href="#see-also" title="Link 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%3A%3AAgg.3.html"><span class="doc">geopm::Agg(3)</span></a>,
<a class="reference internal" href="geopm%3A%3AIOGroup.3.html"><span class="doc">geopm::IOGroup(3)</span></a>,
<a class="reference internal" href="geopm%3A%3APluginFactory.3.html"><span class="doc">geopm::PluginFactory(3)</span></a></p>
</section>
</section>
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