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<span class="target" id="index-0"></span><span class="target" id="index-1"></span><span class="target" id="index-2"></span><span class="target" id="index-3"></span><span class="target" id="index-4"></span><div class="section" id="installation">
<span id="index-5"></span><h1>1. Installation<a class="headerlink" href="#installation" title="Permalink to this headline">¶</a></h1>
<div class="section" id="dependencies">
<h2>1.1. Dependencies<a class="headerlink" href="#dependencies" title="Permalink to this headline">¶</a></h2>
<p>CheMPS2 can be built with <a class="reference external" href="http://www.cmake.org/">CMake</a> and depends on</p>
<ul class="simple">
<li>BLAS</li>
<li>LAPACK</li>
<li>HDF5 (<a class="reference external" href="http://www.hdfgroup.org/HDF5/">Hierarchical Data Format Release 5</a>)</li>
</ul>
<p>It is parallelized for shared memory architectures with the Open Multi-Processing (<a class="reference external" href="http://openmp.org/wp/">OpenMP</a>) API and for distributed memory architectures with the Message Passing Interface (<a class="reference external" href="http://www.mpi-forum.org/">MPI</a>). A hybrid combination of both parallelization strategies is supported.</p>
</div>
<div class="section" id="download">
<h2>1.2. Download<a class="headerlink" href="#download" title="Permalink to this headline">¶</a></h2>
<p>It is advised to clone the CheMPS2 git repository from github. In your terminal, run:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>$ <span class="nb">cd</span> /sourcefolder
$ git clone <span class="s1">'https://github.com/sebwouters/chemps2'</span>
$ <span class="nb">cd</span> chemps2
</pre></div>
</div>
<p>That way, future updates and bug fixes can be easily pulled in:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>$ <span class="nb">cd</span> /sourcefolder/chemps2
$ git pull
</pre></div>
</div>
</div>
<div class="section" id="build-the-chemps2-library-and-binary">
<h2>1.3. Build the chemps2 library and binary<a class="headerlink" href="#build-the-chemps2-library-and-binary" title="Permalink to this headline">¶</a></h2>
<p>The files</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>/sourcefolder/chemps2/CMakeLists.txt
/sourcefolder/chemps2/CheMPS2/CMakeLists.txt
/sourcefolder/chemps2/tests/CMakeLists.txt
/sourcefolder/chemps2/sphinx/CMakeLists.txt
</pre></div>
</div>
<p>provide a minimal compilation. In your terminal, run:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>$ <span class="nb">cd</span> /sourcefolder/chemps2
$ mkdir build
$ <span class="nb">cd</span> build
</pre></div>
</div>
<p>CMake generates makefiles based on the user’s specifications:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>$ <span class="nv">CXX</span><span class="o">=</span>option1 cmake .. -DMKL<span class="o">=</span>option2 -DCMAKE_INSTALL_PREFIX<span class="o">=</span>/option3 -DWITH_MPI<span class="o">=</span>option4
</pre></div>
</div>
<ol class="arabic simple">
<li>Option1 is the <code class="docutils literal"><span class="pre">c++</span></code> compiler; typically <code class="docutils literal"><span class="pre">g++</span></code>, <code class="docutils literal"><span class="pre">icpc</span></code>, or <code class="docutils literal"><span class="pre">clang++</span></code> on Linux. It is advised to use the intel compiler if available.</li>
<li>Option2 can be <code class="docutils literal"><span class="pre">ON</span></code> or <code class="docutils literal"><span class="pre">OFF</span></code> and is used to switch on the intel math kernel library.</li>
<li>/option3 is the prefix of the installation directory; typically <code class="docutils literal"><span class="pre">/usr</span></code> or <code class="docutils literal"><span class="pre">/usr/local</span></code> on Linux. On my computer, libchemps2 is then installed in <code class="docutils literal"><span class="pre">/option3/lib/x86_64-linux-gnu/</span></code>, the headers in <code class="docutils literal"><span class="pre">/option3/include/chemps2/</span></code>, and the binary in <code class="docutils literal"><span class="pre">/option3/bin/chemps2</span></code>.</li>
<li>Option4 can be <code class="docutils literal"><span class="pre">ON</span></code> or <code class="docutils literal"><span class="pre">OFF</span></code> and is used to switch on the possibility to compile with MPI. Please note that the compiler should then provide <code class="docutils literal"><span class="pre">mpi.h</span></code>. Option1 should hence be the <code class="docutils literal"><span class="pre">mpic++</span></code> compiler; typically <code class="docutils literal"><span class="pre">mpic++</span></code> or <code class="docutils literal"><span class="pre">mpiicpc</span></code> on Linux. It is advised to use the intel compiler if available.</li>
</ol>
<p>If one or more of the required libraries are not found, use the command</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>$ <span class="nv">CMAKE_INCLUDE_PATH</span><span class="o">=</span>option5 <span class="nv">CMAKE_LIBRARY_PATH</span><span class="o">=</span>option6 <span class="nv">CXX</span><span class="o">=</span>option1 cmake .. -DMKL<span class="o">=</span>option2 -DCMAKE_INSTALL_PREFIX<span class="o">=</span>/option3 -DWITH_MPI<span class="o">=</span>option4
</pre></div>
</div>
<p>instead, where option5 and option6 are respectively the missing colon-separated include and library paths:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span><span class="nv">CMAKE_INCLUDE_PATH</span><span class="o">=</span>/my_libs/lib1/include:/my_libs/lib2/include
<span class="nv">CMAKE_LIBRARY_PATH</span><span class="o">=</span>/my_libs/lib1/lib:/my_libs/lib2/lib
</pre></div>
</div>
<p>For operating systems based on debian, the HDF5 headers are located in the folder <code class="docutils literal"><span class="pre">/usr/include/hdf5/serial/</span></code>. If CMake complains about the HDF5 headers, try to pass it with the option <code class="docutils literal"><span class="pre">-DHDF5_INCLUDE_DIRS=/usr/include/hdf5/serial</span></code>.</p>
<p>For building with GCC, errors involving unresolved symbols or a message <code class="docutils literal"><span class="pre">plugin</span> <span class="pre">needed</span> <span class="pre">to</span> <span class="pre">handle</span> <span class="pre">lto</span> <span class="pre">object</span></code> may indicate a failure of the interprocedural optimization. This can be resolved by passing full locations to gcc toolchain utilites to the <code class="docutils literal"><span class="pre">setup</span></code> command above: <code class="docutils literal"><span class="pre">-DCMAKE_RANLIB=/path/to/gcc-ranlib</span> <span class="pre">-DCMAKE_AR=/path/to/gcc-ar</span></code> .</p>
<p>To compile, run:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>$ make
</pre></div>
</div>
<p>To install, run:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>$ make install
</pre></div>
</div>
<p>For non-standard installation directories, please remember to append the library path to <code class="docutils literal"><span class="pre">LD_LIBRARY_PATH</span></code> in your <code class="docutils literal"><span class="pre">.bashrc</span></code>.</p>
</div>
<div class="section" id="test-libchemps2">
<h2>1.4. Test libchemps2<a class="headerlink" href="#test-libchemps2" title="Permalink to this headline">¶</a></h2>
<p>To test libchemps2 for compilation <strong>without MPI</strong>, run:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>$ <span class="nb">cd</span> /sourcefolder/chemps2/build
$ make <span class="nb">test</span>
</pre></div>
</div>
<p>To test libchemps2 for compilation <strong>with MPI</strong>, run:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>$ <span class="nb">cd</span> /sourcefolder/chemps2/build/tests
$ <span class="nv">OMP_NUM_THREADS</span><span class="o">=</span>YYY mpirun -np ZZZ ./test1
$ <span class="nv">OMP_NUM_THREADS</span><span class="o">=</span>YYY mpirun -np ZZZ ./test2
...
</pre></div>
</div>
<p><code class="docutils literal"><span class="pre">YYY</span></code> specifies the number of threads per process and <code class="docutils literal"><span class="pre">ZZZ</span></code> the number of processes. Note that the tests are too small to see (near) linear scaling with the number of cores, although improvement should still be noticeable.</p>
</div>
<div class="section" id="test-the-chemps2-binary">
<h2>1.5. Test the chemps2 binary<a class="headerlink" href="#test-the-chemps2-binary" title="Permalink to this headline">¶</a></h2>
<p>To test the chemps2 binary for compilation <strong>without MPI</strong>, run:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>$ man /sourcefolder/chemps2/chemps2.1
$ <span class="nb">cd</span> /sourcefolder/chemps2/build/CheMPS2
$ ./chemps2 --help
$ cp /sourcefolder/chemps2/tests/test14.input .
$ sed -i <span class="s2">"s/path\/to/sourcefolder\/chemps2\/tests\/matrixelements/"</span> test14.input
$ cat test14.input
$ ./chemps2 --file<span class="o">=</span>test14.input
</pre></div>
</div>
<p>Note that when you use the CASPT2 checkpoint, and want to restart a
calculation at a later point, you should</p>
<blockquote>
<div><ol class="arabic simple">
<li>switch the option <code class="docutils literal"><span class="pre">SCF_ACTIVE_SPACE</span></code> to <code class="docutils literal"><span class="pre">I</span></code></li>
<li>remove the <code class="docutils literal"><span class="pre">CheMPS2_DIIS.h5</span></code> checkpoint</li>
</ol>
</div></blockquote>
<p>in order to ensure that <strong>exactly</strong> the same orbitals are used in the different runs.</p>
<p>To test the chemps2 binary for compilation <strong>with MPI</strong>, prepend the binary with:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>$ <span class="nv">OMP_NUM_THREADS</span><span class="o">=</span>YYY mpirun -np ZZZ ./chemps2 --file<span class="o">=</span>test14.input
</pre></div>
</div>
</div>
<div class="section" id="build-pychemps2">
<h2>1.6. Build PyCheMPS2<a class="headerlink" href="#build-pychemps2" title="Permalink to this headline">¶</a></h2>
<p>PyCheMPS2 is a python interface to libchemps2, for compilation <strong>without MPI</strong>. It can be built with <a class="reference external" href="http://cython.org/">Cython</a>. The installation is independent of CMake and assumes that you have installed the CheMPS2 library with <code class="docutils literal"><span class="pre">make</span> <span class="pre">install</span></code>. For non-standard installation directories of CheMPS2, please remember to append the library path to <code class="docutils literal"><span class="pre">LD_LIBRARY_PATH</span></code> in your <code class="docutils literal"><span class="pre">.bashrc</span></code>. In addition, the include path should be appended to <code class="docutils literal"><span class="pre">CPATH</span></code>:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>$ <span class="nb">export</span> <span class="nv">CPATH</span><span class="o">=</span><span class="si">${</span><span class="nv">CPATH</span><span class="si">}</span>:/option3/include
</pre></div>
</div>
<p>where <code class="docutils literal"><span class="pre">/option3</span></code> is the option provided to CMake with <code class="docutils literal"><span class="pre">-DCMAKE_INSTALL_PREFIX=/option3</span></code> above. For operating systems based on debian, the HDF5 headers are located in the folder <code class="docutils literal"><span class="pre">/usr/include/hdf5/serial/</span></code>. If it was explicitly passed to CMake, it should also be appended to <code class="docutils literal"><span class="pre">CPATH</span></code>:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>$ <span class="nb">export</span> <span class="nv">CPATH</span><span class="o">=</span><span class="si">${</span><span class="nv">CPATH</span><span class="si">}</span>:/option3/include:/usr/include/hdf5/serial
</pre></div>
</div>
<p>The python wrapper can be installed with:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>$ <span class="nb">cd</span> /sourcefolder/chemps2/PyCheMPS2
$ python setup.py build_ext -L <span class="si">${</span><span class="nv">LD_LIBRARY_PATH</span><span class="si">}</span>
$ python setup.py install --prefix<span class="o">=</span>/option3
</pre></div>
</div>
<p>On my machine, the python wrapper is installed to the folder <code class="docutils literal"><span class="pre">/option3/lib/python2.7/site-packages</span></code>, but the folder <code class="docutils literal"><span class="pre">lib</span></code> and the distribution of python can vary.</p>
<p>Compilation of PyCheMPS2 occurs by linking to the <code class="docutils literal"><span class="pre">c++</span></code> library in the installation directory. The installation of PyCheMPS2 will fail if that library is not properly installed. If you have pulled a newer version of CheMPS2, please remember to reinstall the <code class="docutils literal"><span class="pre">c++</span></code> library first, before reinstalling PyCheMPS2!</p>
</div>
<div class="section" id="test-pychemps2">
<h2>1.7. Test PyCheMPS2<a class="headerlink" href="#test-pychemps2" title="Permalink to this headline">¶</a></h2>
<p>When libchemps2 has been compiled <strong>without MPI</strong>, PyCheMPS2 can be tested by running (remember that the python site-packages folder can vary):</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>$ <span class="nb">cd</span> /sourcefolder/chemps2/PyCheMPS2/tests
$ <span class="nb">export</span> <span class="nv">PYTHONPATH</span><span class="o">=</span><span class="si">${</span><span class="nv">PYTHONPATH</span><span class="si">}</span>:/option3/lib/python2.7/site-packages
$ python test1.py
$ python test2.py
...
</pre></div>
</div>
<p>If you compiled the <code class="docutils literal"><span class="pre">c++</span></code> library with <code class="docutils literal"><span class="pre">-DMKL=ON</span></code>, you might get the error</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>Intel MKL FATAL ERROR: Cannot load libmkl_avx.so or libmkl_def.so.
</pre></div>
</div>
<p>This issue of using Intel’s MKL inside python is known and reported. To get the python tests to run, you can set the variable <code class="docutils literal"><span class="pre">LD_PRELOAD</span></code> in order to preload libmkl_rt.so. On my system, this is done with</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>$ <span class="nb">export</span> <span class="nv">LD_PRELOAD</span><span class="o">=</span>/opt/intel/mkl/lib/intel64/libmkl_rt.so
</pre></div>
</div>
<p>The python tests do exactly the same thing as the <code class="docutils literal"><span class="pre">c++</span></code> tests above, and illustrate the usage of the python interface to libchemps2. The tests should end with a line stating whether or not they succeeded. Note that the tests are too small to see (near) linear scaling with the number of cores, although improvement should still be noticeable.</p>
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<h3><a href="index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">1. Installation</a><ul>
<li><a class="reference internal" href="#dependencies">1.1. Dependencies</a></li>
<li><a class="reference internal" href="#download">1.2. Download</a></li>
<li><a class="reference internal" href="#build-the-chemps2-library-and-binary">1.3. Build the chemps2 library and binary</a></li>
<li><a class="reference internal" href="#test-libchemps2">1.4. Test libchemps2</a></li>
<li><a class="reference internal" href="#test-the-chemps2-binary">1.5. Test the chemps2 binary</a></li>
<li><a class="reference internal" href="#build-pychemps2">1.6. Build PyCheMPS2</a></li>
<li><a class="reference internal" href="#test-pychemps2">1.7. Test PyCheMPS2</a></li>
</ul>
</li>
</ul>
<h4>Previous topic</h4>
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title="next chapter">2. Publications</a></p>
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