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<li class="toctree-l1"><a class="reference internal" href="release-notes/index.html">3. Release notes</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="how-things-work/index.html">6. How Things Work</a></li>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">7. Release Notes</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="#general-notes">7.1. General notes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#compiler-notes">7.2. Compiler Notes</a></li>
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<li class="toctree-l1"><a class="reference internal" href="versions.html">9. Version Numbers and Binary Compatibility</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-l1"><a class="reference internal" href="developers/index.html">12. Developer’s guide</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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<h1><span class="section-number">7. </span>Release Notes<a class="headerlink" href="#release-notes" title="Permalink to this heading"></a></h1>
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<p>The following abbreviated list of release notes applies to this code
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base as of this writing (10 Mar 2023):</p>
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<div class="section" id="general-notes">
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<h2><span class="section-number">7.1. </span>General notes<a class="headerlink" href="#general-notes" title="Permalink to this heading"></a></h2>
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<ul class="simple">
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<li><p>Systems that have been tested are:</p>
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<ul>
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<li><p>Linux (various flavors/distros), 64 bit (x86), with gcc, Intel,
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and Portland (*)</p></li>
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<li><p>OS X (10.7 and above), 64 bit (x86_64), with gcc and clang (*)</p></li>
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</ul>
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</li>
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<li><p>OpenPMIx has taken some steps towards Reproducible Builds
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(<a class="reference external" href="https://reproducible-builds.org/">https://reproducible-builds.org/</a>). Specifically, OpenPMIx’s
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<code class="docutils literal notranslate"><span class="pre">configure</span></code> and <code class="docutils literal notranslate"><span class="pre">make</span></code> process, by default, records the build date
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and some system-specific information such as the hostname where OpenPMIx
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was built and the username who built it. If you desire a
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Reproducible Build, set the <code class="docutils literal notranslate"><span class="pre">$SOURCE_DATE_EPOCH</span></code>, <code class="docutils literal notranslate"><span class="pre">$USER</span></code> and <code class="docutils literal notranslate"><span class="pre">$HOSTNAME</span></code>
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environment variables before invoking <code class="docutils literal notranslate"><span class="pre">configure</span></code> and <code class="docutils literal notranslate"><span class="pre">make</span></code>, and
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OpenPMIx will use those values instead of invoking <code class="docutils literal notranslate"><span class="pre">whoami</span></code> and/or
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<code class="docutils literal notranslate"><span class="pre">hostname</span></code>, respectively. See
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<a class="reference external" href="https://reproducible-builds.org/docs/source-date-epoch/">https://reproducible-builds.org/docs/source-date-epoch/</a> for
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information on the expected format and content of the
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<code class="docutils literal notranslate"><span class="pre">$SOURCE_DATE_EPOCH</span></code> variable.</p></li>
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</ul>
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</div>
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<div class="section" id="compiler-notes">
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<h2><span class="section-number">7.2. </span>Compiler Notes<a class="headerlink" href="#compiler-notes" title="Permalink to this heading"></a></h2>
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<ul>
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<li><p>The Portland Group compilers prior to version 7.0 require the
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<code class="docutils literal notranslate"><span class="pre">-Msignextend</span></code> compiler flag to extend the sign bit when converting
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from a shorter to longer integer. This is is different than other
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compilers (such as GNU). When compiling PMIx with the Portland
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compiler suite, the following flags should be passed to PMIx’s
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configure script:</p>
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<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>shell$<span class="w"> </span>./configure<span class="w"> </span><span class="nv">CFLAGS</span><span class="o">=</span>-Msignextend<span class="w"> </span>...
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</pre></div>
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</div>
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<p>This will compile PMIx with the proper compile flags.</p>
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</li>
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<li><p>Running on nodes with different endian and/or different datatype
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sizes within a single parallel job is supported in this release.
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However, PMIx does not resize data when datatypes differ in size
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(for example, sending a 4 byte double and receiving an 8 byte
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double will fail).</p></li>
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</ul>
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