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<div class="lammps_version">Version: <b>19 Nov 2024</b></div>
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<li class="toctree-l1"><a class="reference internal" href="Library.html">1. LAMMPS Library Interfaces</a></li>
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<p><span class="math notranslate nohighlight">\(\renewcommand{\AA}{\text{Å}}\)</span></p>
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<section id="notes-for-saving-disk-space-when-building-lammps-from-source">
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<h1><span class="section-number">3.10. </span>Notes for saving disk space when building LAMMPS from source<a class="headerlink" href="#notes-for-saving-disk-space-when-building-lammps-from-source" title="Link to this heading"></a></h1>
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<p>LAMMPS is a large software project with a large number of source files,
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extensive documentation, and a large collection of example files.
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When downloading LAMMPS by cloning the
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<a class="reference external" href="https://github.com/lammps/lammps">git repository from GitHub</a> this
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will by default also download the entire commit history since September 2006.
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Compiling LAMMPS will add the storage requirements of the compiled object
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files and libraries to the tally.</p>
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<p>In a user account on an HPC cluster with filesystem quotas or in other
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environments with restricted disk space capacity it may be needed to
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reduce the storage requirements. Here are some suggestions:</p>
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<ul class="simple">
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<li><p>Create a so-called shallow repository by cloning only the last commit
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instead of the full project history by using <code class="docutils literal notranslate"><span class="pre">git</span> <span class="pre">clone</span> <span class="pre">git@github.com:lammps/lammps</span> <span class="pre">--depth=1</span> <span class="pre">--branch=develop</span></code>.
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This reduces the downloaded size to about half. With <code class="docutils literal notranslate"><span class="pre">--depth=1</span></code> it is not possible to check out different
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versions/branches of LAMMPS, using <code class="docutils literal notranslate"><span class="pre">--depth=1000</span></code> will make multiple recent versions available at little
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extra storage needs (the entire git history had nearly 30,000 commits in fall 2021).</p></li>
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<li><p>Download a tar archive from either the <a class="reference external" href="https://www.lammps.org/download.html">download section on the LAMMPS homepage</a>
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or from the <a class="reference external" href="https://github.com/lammps/lammps/releases">LAMMPS releases page on GitHub</a> these will not
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contain the git history at all.</p></li>
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<li><p>Build LAMMPS without the debug flag (remove <code class="docutils literal notranslate"><span class="pre">-g</span></code> from the machine makefile or use <code class="docutils literal notranslate"><span class="pre">-DCMAKE_BUILD_TYPE=Release</span></code>)
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or use the <code class="docutils literal notranslate"><span class="pre">strip</span></code> command on the LAMMPS executable when no more debugging would be needed. The strip command
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may also be applied to the LAMMPS shared library. The static library may be deleted entirely.</p></li>
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<li><p>Delete compiled object files and libraries after copying the LAMMPS executable to a permanent location.
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When using the traditional build process, one may use <code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">clean-<machine></span></code> or <code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">clean-all</span></code>
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to delete object files in the src folder. For CMake based builds, one may use <code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">clean</span></code> or just
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delete the entire build folder.</p></li>
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<li><p>The folders containing the documentation tree (doc), the examples (examples) are not needed to build and
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run LAMMPS and can be safely deleted. Some files in the potentials folder are large and may be deleted,
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if not needed. The largest of those files (occupying about 120 MBytes combined) will only be downloaded on
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demand, when the corresponding package is installed.</p></li>
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<li><p>When using the CMake build procedure, the compilation can be done on a (local) scratch storage that will not
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count toward the quota. A local scratch file system may offer the additional benefit of speeding up creating
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object files and linking with libraries compared to a networked file system. Also with CMake (and unlike with
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the traditional make) it is possible to compile LAMMPS executables with different settings and packages included
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from the same source tree since all the configuration information is stored in the build folder. So it is
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not necessary to have multiple copies of LAMMPS.</p></li>
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