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<section id="geopm-agent-ffnet-7-agent-for-adjusting-frequencies-based-on-application-behavior">
<h1>geopm_agent_ffnet(7) – agent for adjusting frequencies based on application behavior<a class="headerlink" href="#geopm-agent-ffnet-7-agent-for-adjusting-frequencies-based-on-application-behavior" title="Link to this heading"></a></h1>
<section id="description">
<h2>Description<a class="headerlink" href="#description" title="Link to this heading"></a></h2>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>This is currently an experimental agent and is only available when
building GEOPM with the <code class="docutils literal notranslate"><span class="pre">--enable-beta</span></code> flag. The agent is subject
to change, including being combined with other agents. Also, this agent
requires a neural net JSON file, the format of which is described by
the schema domainnetmap_neural_net.schema.json and a region hint
recommender JSON file described by the schema
regionhintrecommender_fmap.schema.json. Without these inputs, the agent
will throw an error. The autogeneration of these files is future work.</p>
</div>
<p>The FFNet agent adjusts frequencies per domain for the goal of improved energy
efficiency with minimal performance loss. The agent instantiates a neural net
per domain that ingests hardware telemetry and outputs a probability distribution
of region classes. This probability distribution is used to determine an optimal
per-domain frequency. The agent policy can specify an energy-performance bias which
determines the degree to which the frequency recommender is adverse to potentially
reducing performance by reducing frequency to save energy.</p>
<p>The neural net for region classification must be provided in a JSON configuration
file pointed to by environment variables GEOPM_CPU_NN_PATH and/or GEOPM_GPU_NN_PATH,
which must comply with the following schema:</p>
<div class="highlight-json notranslate"><div class="highlight"><pre><span></span><span class="p">{</span>
<span class="w"> </span><span class="nt">"$schema"</span><span class="p">:</span><span class="w"> </span><span class="s2">"http://json-schema.org/draft-04/schema#"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"id"</span><span class="p">:</span><span class="w"> </span><span class="s2">"https://geopm.github.io/domainnetmap_neural_net.schema.json"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"title"</span><span class="p">:</span><span class="w"> </span><span class="s2">"NeuralNet"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"object"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"properties"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"layers"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"array"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"items"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"array"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"prefixItems"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"array"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"items"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"array"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"items"</span><span class="p">:</span><span class="w"> </span><span class="s2">"number"</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"array"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"items"</span><span class="p">:</span><span class="w"> </span><span class="s2">"number"</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">],</span>
<span class="w"> </span><span class="nt">"additionalItems"</span><span class="p">:</span><span class="w"> </span><span class="kc">false</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"minItems"</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"maxItems"</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"signal_inputs"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"array"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"items"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"string"</span><span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"delta_inputs"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"array"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"items"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"array"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"prefixItems"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
<span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"string"</span><span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"string"</span><span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">],</span>
<span class="w"> </span><span class="nt">"additionalItems"</span><span class="p">:</span><span class="w"> </span><span class="kc">false</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"minItems"</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"maxItems"</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"trace_outputs"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"array"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"items"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"string"</span><span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"description"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"string"</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"required"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"layers"</span><span class="p">,</span><span class="w"> </span><span class="s2">"trace_outputs"</span><span class="p">],</span>
<span class="w"> </span><span class="nt">"oneOf"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span>
<span class="w"> </span><span class="p">{</span><span class="nt">"required"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"signal_inputs"</span><span class="p">]},</span>
<span class="w"> </span><span class="p">{</span><span class="nt">"required"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"delta_inputs"</span><span class="p">]}</span>
<span class="w"> </span><span class="p">],</span>
<span class="w"> </span><span class="nt">"additionalProperties"</span><span class="p">:</span><span class="w"> </span><span class="kc">false</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The per-region frequency recommendations must be provided in a JSON configuration
file pointed to by environment variables GEOPM_CPU_FMAP_PATH and/or GEOPM_GPU_FMAP_PATH,
which must comply with the following schema:</p>
<div class="highlight-json notranslate"><div class="highlight"><pre><span></span><span class="p">{</span>
<span class="w"> </span><span class="nt">"$schema"</span><span class="p">:</span><span class="w"> </span><span class="s2">"http://json-schema.org/draft-04/schema#"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"id"</span><span class="p">:</span><span class="w"> </span><span class="s2">"https://geopm.github.io/regionhintrecommender_fmap.schema.json"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"title"</span><span class="p">:</span><span class="w"> </span><span class="s2">"Region Frequency Map"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"object"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"additionalProperties"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"array"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"items"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"number"</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>If you specify a neural net for a domain (CPU/GPU), you must specify a frequency
recommendation as well.</p>
<p>This agent can be used at the package scope to control CPU frequency
and/or at the per-GPU scope to control GPU frequency.</p>
</section>
<section id="agent-name">
<h2>Agent Name<a class="headerlink" href="#agent-name" title="Link to this heading"></a></h2>
<p>The agent described in this manual is selected in many geopm
interfaces with the <code class="docutils literal notranslate"><span class="pre">"ffnet"</span></code> agent name. This name can be
passed to <a class="reference internal" href="geopmlaunch.1.html"><span class="doc">geopmlaunch(1)</span></a> as the argument to the <code class="docutils literal notranslate"><span class="pre">--geopm-agent</span></code>
option, or the <code class="docutils literal notranslate"><span class="pre">GEOPM_AGENT</span></code> environment variable can be set to this
name (see <a class="reference internal" href="geopm.7.html"><span class="doc">geopm(7)</span></a>). This name can also be passed to the
<a class="reference internal" href="geopmagent.1.html"><span class="doc">geopmagent(1)</span></a> as the argument to the <code class="docutils literal notranslate"><span class="pre">'-a'</span></code> option.</p>
</section>
<section id="policy-parameters">
<h2>Policy Parameters<a class="headerlink" href="#policy-parameters" title="Link to this heading"></a></h2>
<blockquote>
<div><dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">PERF_ENERGY_BIAS</span></code> :</dt><dd><p>A value between [0-1] that determines how aggressively
the agent will reduce frequency in order to save energy.
A value of 0 indicates that no performance loss can be
tolerated, while a value of 1 indicates that energy
efficiency is paramount. Note that there are no absolute
guarantees about performance; rather, the general trend
of performance impact and energy efficiency will be
monotonic relative to this bias.</p>
</dd>
</dl>
</div></blockquote>
</section>
<section id="policy-requirements">
<h2>Policy Requirements<a class="headerlink" href="#policy-requirements" title="Link to this heading"></a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">PERF_ENERGY_BIAS</span></code> must be between 0 and 1.</p>
</section>
<section id="report-extensions">
<h2>Report Extensions<a class="headerlink" href="#report-extensions" title="Link to this heading"></a></h2>
<p>N/A</p>
</section>
<section id="control-loop-rate">
<h2>Control Loop Rate<a class="headerlink" href="#control-loop-rate" title="Link to this heading"></a></h2>
<p>The agent gates the control loop to sample hardware telemetry and
control frequency at 20 millisecond intervals.</p>
</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%3AAgent.3.html"><span class="doc">geopm::Agent(3)</span></a>,
<a class="reference internal" href="geopm_agent.3.html"><span class="doc">geopm_agent(3)</span></a>,
<a class="reference internal" href="geopmagent.1.html"><span class="doc">geopmagent(1)</span></a>,
<a class="reference internal" href="geopmlaunch.1.html"><span class="doc">geopmlaunch(1)</span></a></p>
</section>
</section>
</div>
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