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<li class="toctree-l1"><a class="reference internal" href="../quickstart.html">1. Quick start</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../exceptions.html">4. Exceptions to the PMIx Standard</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../installing-pmix/index.html">5. Building and installing PMIx</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../mca.html">10. The Modular Component Architecture (MCA)</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../building-apps/index.html">11. Building PMIx applications</a></li>
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<li class="toctree-l2"><a class="reference internal" href="prerequisites.html">12.1. Prerequisites</a></li>
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<li class="toctree-l2"><a class="reference internal" href="git-github.html">12.2. GitHub, Git, and related topics</a></li>
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<li class="toctree-l2"><a class="reference internal" href="compiler-pickyness.html">12.3. Compiler Pickyness by Default</a></li>
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<li class="toctree-l2"><a class="reference internal" href="autogen.html">12.4. Running <code class="docutils literal notranslate"><span class="pre">autogen.pl</span></code></a></li>
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<li class="toctree-l2"><a class="reference internal" href="building-pmix.html">12.5. Building PMIx</a></li>
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<li class="toctree-l2 current"><a class="current reference internal" href="#">12.6. OpenPMIx terminology</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="#modular-component-architecture-mca">12.6.1. Modular Component Architecture (MCA)</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#required-3rd-party-libraries">12.6.2. Required 3rd party libraries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="source-code.html">12.7. Source code</a></li>
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<li class="toctree-l2"><a class="reference internal" href="rst-for-markdown-expats.html">12.11. ReStructured Text for those who know Markdown</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../contributing.html">13. Contributing to OpenPMIx</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../license.html">14. License</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../security.html">15. OpenPMIx Security Policy</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../news/index.html">16. News</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../man/index.html">17. OpenPMIx manual pages</a></li>
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<li class="breadcrumb-item active"><span class="section-number">12.6. </span>OpenPMIx terminology</li>
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</style><div class="section" id="openpmix-terminology">
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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>
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<p>OpenPMIx is a medium-sized project containing a number of different sub-systems and
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a relatively big code base. Let’s first cover some fundamental
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terminology in order to make the rest of the discussion easier.</p>
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<p>First, note that you will see <code class="docutils literal notranslate"><span class="pre">OpenPMIx</span></code> frequently referred to
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as just <code class="docutils literal notranslate"><span class="pre">PMIx</span></code>. While there is a separate PMIx Standard, there
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are (as of this writing) no alternative implementations of that
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Standard. In fact, the Standard post-dates the library by several
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years, and often lags behind the library in terms of new definitions.
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Thus, it is customary to refer to the library as just <code class="docutils literal notranslate"><span class="pre">PMIx</span></code> and
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drop the longer name - at least, until some other implementation
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arises (which many consider unlikely).</p>
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<div class="section" id="modular-component-architecture-mca">
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<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>
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<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
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Component Architecture (MCA). Seriously. Go read it now. From
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reading that section, you should understand the following terms before
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continuing reading these docs:</p>
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<ul class="simple">
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<li><p>Framework</p></li>
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<li><p>Component</p></li>
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<li><p>Module</p></li>
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<li><p>Parameters (variables)</p></li>
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</ul>
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<p>Frameworks, components, and modules can be dynamic or static. That is,
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they can be available as plugins or they may be compiled statically
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into libraries (e.g., <code class="docutils literal notranslate"><span class="pre">libpmix</span></code>).</p>
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<p>In PMIx, <code class="docutils literal notranslate"><span class="pre">configure</span></code> defaults to:</p>
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<ul class="simple">
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<li><p>Building <code class="docutils literal notranslate"><span class="pre">libpmix</span></code> as a dynamic library</p></li>
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<li><p>Linking all components directly into the <code class="docutils literal notranslate"><span class="pre">libpmix</span></code> libraries
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(vs. compiling them as independent DSOs)</p></li>
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</ul>
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<p>These defaults can be modified by <a class="reference internal" href="../installing-pmix/configure-cli-options/index.html"><span class="doc">command line
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arguments to configure</span></a>.</p>
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</div>
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<div class="section" id="required-3rd-party-libraries">
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<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>
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<p>Note that PMIx uses two third-party libraries for core
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functionality:</p>
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<ul class="simple">
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<li><p>Libevent or Libev</p></li>
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<li><p>Hardware Locality (“hwloc”)</p></li>
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</ul>
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<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
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section</span></a>.</p>
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