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<title>5.OPT package — LAMMPS 15 May 2015 version documentation</title>
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<a href="Manual.html" class="icon icon-home"> LAMMPS
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="Section_intro.html">1. Introduction</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_start.html">2. Getting Started</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_commands.html">3. Commands</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_packages.html">4. Packages</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_accelerate.html">5. Accelerating LAMMPS performance</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_howto.html">6. How-to discussions</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_example.html">7. Example problems</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_perf.html">8. Performance & scalability</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_tools.html">9. Additional tools</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_modify.html">10. Modifying & extending LAMMPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_python.html">11. Python interface to LAMMPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_errors.html">12. Errors</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_history.html">13. Future and history</a></li>
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<li>5.OPT package</li>
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<a href="http://lammps.sandia.gov">Website</a>
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<p><a class="reference internal" href="Section_accelerate.html"><em>Return to Section accelerate overview</em></a></p>
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<div class="section" id="opt-package">
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<h1>5.OPT package<a class="headerlink" href="#opt-package" title="Permalink to this headline">¶</a></h1>
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<p>The OPT package was developed by James Fischer (High Performance
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Technologies), David Richie, and Vincent Natoli (Stone Ridge
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Technologies). It contains a handful of pair styles whose compute()
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methods were rewritten in C++ templated form to reduce the overhead
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due to if tests and other conditional code.</p>
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<p>Here is a quick overview of how to use the OPT package:</p>
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<ul class="simple">
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<li>include the OPT package and build LAMMPS</li>
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<li>use OPT pair styles in your input script</li>
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</ul>
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<p>The last step can be done using the “-sf opt” <a class="reference internal" href="Section_start.html#start-7"><span>command-line switch</span></a>. Or the effect of the “-sf” switch
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can be duplicated by adding a <a class="reference internal" href="suffix.html"><em>suffix opt</em></a> command to your
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input script.</p>
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<p><strong>Required hardware/software:</strong></p>
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<p>None.</p>
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<p><strong>Building LAMMPS with the OPT package:</strong></p>
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<p>Include the package and build LAMMPS:</p>
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<p>To do this in one line, use the src/Make.py script, described in
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<a class="reference internal" href="Section_start.html#start-4"><span>Section 2.4</span></a> of the manual. Type “Make.py
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-h” for help. If run from the src directory, this command will create
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src/lmp_opt using src/MAKE/Makefile.mpi as the starting
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Makefile.machine:</p>
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<div class="highlight-python"><div class="highlight"><pre>Make.py -p opt -o opt -a file mpi
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</pre></div>
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</div>
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<p>Or you can follow these steps:</p>
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<div class="highlight-python"><div class="highlight"><pre>cd lammps/src
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make yes-opt
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make machine
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</pre></div>
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</div>
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<p>If you are using Intel compilers, then the CCFLAGS setting in
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Makefile.machine needs to include “-restrict”.</p>
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<p><strong>Run with the OPT package from the command line:</strong></p>
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<p>Use the “-sf opt” <a class="reference internal" href="Section_start.html#start-7"><span>command-line switch</span></a>,
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which will automatically append “opt” to styles that support it.</p>
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<div class="highlight-python"><div class="highlight"><pre>lmp_machine -sf opt -in in.script
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mpirun -np 4 lmp_machine -sf opt -in in.script
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</pre></div>
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</div>
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<p><strong>Or run with the OPT package by editing an input script:</strong></p>
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<p>Use the <a class="reference internal" href="suffix.html"><em>suffix opt</em></a> command, or you can explicitly add an
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“opt” suffix to individual styles in your input script, e.g.</p>
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<div class="highlight-python"><div class="highlight"><pre>pair_style lj/cut/opt 2.5
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</pre></div>
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</div>
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<p><strong>Speed-ups to expect:</strong></p>
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<p>You should see a reduction in the “Pair time” value printed at the end
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of a run. On most machines for reasonable problem sizes, it will be a
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5 to 20% savings.</p>
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<p><strong>Guidelines for best performance:</strong></p>
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<p>None. Just try out an OPT pair style to see how it performs.</p>
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<div class="section" id="restrictions">
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<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline">¶</a></h2>
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<p>None.</p>
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