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<h1><span class="section-number">12.6. </span>OpenPMIx terminology<a class="headerlink" href="#openpmix-terminology" title="Permalink to this heading"></a></h1>
<p>OpenPMIx is a medium-sized project containing a number of different sub-systems and
a relatively big code base. Let’s first cover some fundamental
terminology in order to make the rest of the discussion easier.</p>
<p>First, note that you will see <code class="docutils literal notranslate"><span class="pre">OpenPMIx</span></code> frequently referred to
as just <code class="docutils literal notranslate"><span class="pre">PMIx</span></code>. While there is a separate PMIx Standard, there
are (as of this writing) no alternative implementations of that
Standard. In fact, the Standard post-dates the library by several
years, and often lags behind the library in terms of new definitions.
Thus, it is customary to refer to the library as just <code class="docutils literal notranslate"><span class="pre">PMIx</span></code> and
drop the longer name - at least, until some other implementation
arises (which many consider unlikely).</p>
<div class="section" id="modular-component-architecture-mca">
<h2><span class="section-number">12.6.1. </span>Modular Component Architecture (MCA)<a class="headerlink" href="#modular-component-architecture-mca" title="Permalink to this heading"></a></h2>
<p><a class="reference internal" href="../mca.html#label-mca"><span class="std std-ref">See this section</span></a> for a discussion of the Modular
Component Architecture (MCA). Seriously. Go read it now. From
reading that section, you should understand the following terms before
continuing reading these docs:</p>
<ul class="simple">
<li><p>Framework</p></li>
<li><p>Component</p></li>
<li><p>Module</p></li>
<li><p>Parameters (variables)</p></li>
</ul>
<p>Frameworks, components, and modules can be dynamic or static. That is,
they can be available as plugins or they may be compiled statically
into libraries (e.g., <code class="docutils literal notranslate"><span class="pre">libpmix</span></code>).</p>
<p>In PMIx, <code class="docutils literal notranslate"><span class="pre">configure</span></code> defaults to:</p>
<ul class="simple">
<li><p>Building <code class="docutils literal notranslate"><span class="pre">libpmix</span></code> as a dynamic library</p></li>
<li><p>Linking all components directly into the <code class="docutils literal notranslate"><span class="pre">libpmix</span></code> libraries
(vs. compiling them as independent DSOs)</p></li>
</ul>
<p>These defaults can be modified by <a class="reference internal" href="../installing-pmix/configure-cli-options/index.html"><span class="doc">command line
arguments to configure</span></a>.</p>
</div>
<div class="section" id="required-3rd-party-libraries">
<h2><span class="section-number">12.6.2. </span>Required 3rd party libraries<a class="headerlink" href="#required-3rd-party-libraries" title="Permalink to this heading"></a></h2>
<p>Note that PMIx uses two third-party libraries for core
functionality:</p>
<ul class="simple">
<li><p>Libevent or Libev</p></li>
<li><p>Hardware Locality (“hwloc”)</p></li>
</ul>
<p>These are discussed in detail in the <a class="reference internal" href="../installing-pmix/required-support-libraries.html#label-install-required-support-libraries"><span class="std std-ref">required support libraries
section</span></a>.</p>
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