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<h1 id="cray-programming-environment">Cray Programming Environment<a class="headerlink" href="#cray-programming-environment" title="Permanent link"></a></h1>
<h2 id="loading-the-cray-module">Loading the Cray module<a class="headerlink" href="#loading-the-cray-module" title="Permanent link"></a></h2>
<p>The Cray Programming Environment, with Cray's compilers and MPI, is not loaded by default.</p>
<p>To load it, one has to run the following command:</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>module<span class="w"> </span>load<span class="w"> </span>cray
</span></code></pre></div>
<p>The Cray Programming Environment will load all the necessary dependencies. In example:</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>🔥<span class="w"> </span><span class="o">[</span>caubet_m@login001:~<span class="o">]</span><span class="c1"># module list</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>Currently<span class="w"> </span>Loaded<span class="w"> </span>Modules:
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="w"> </span><span class="m">1</span><span class="o">)</span><span class="w"> </span>craype-x86-rome<span class="w"> </span><span class="m">2</span><span class="o">)</span><span class="w"> </span>libfabric/1.15.2.0
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="w"> </span><span class="m">3</span><span class="o">)</span><span class="w"> </span>craype-network-ofi
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="w"> </span><span class="m">4</span><span class="o">)</span><span class="w"> </span>xpmem/2.9.6-1.1_20240510205610__g087dc11fc19d<span class="w"> </span><span class="m">5</span><span class="o">)</span><span class="w"> </span>PrgEnv-cray/8.5.0
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="w"> </span><span class="m">6</span><span class="o">)</span><span class="w"> </span>cce/17.0.0<span class="w"> </span><span class="m">7</span><span class="o">)</span><span class="w"> </span>cray-libsci/23.12.5
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="w"> </span><span class="m">8</span><span class="o">)</span><span class="w"> </span>cray-mpich/8.1.28<span class="w"> </span><span class="m">9</span><span class="o">)</span><span class="w"> </span>craype/2.7.30
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="m">10</span><span class="o">)</span><span class="w"> </span>perftools-base/23.12.0<span class="w"> </span><span class="m">11</span><span class="o">)</span><span class="w"> </span>cpe/23.12
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a><span class="m">12</span><span class="o">)</span><span class="w"> </span>cray/23.12
</span></code></pre></div>
<p>You will notice an unfamiliar <code>PrgEnv-cray/8.5.0</code> that was loaded. This is a meta-module that Cray provides to simplify the switch of compilers and their associated dependencies and libraries,
as a whole called Programming Environment. In the Cray Programming Environment, there are 4 key modules.</p>
<ul>
<li><code>cray-libsci</code> is a collection of numerical routines tuned for performance on Cray systems.</li>
<li><code>libfabric</code> is an important low-level library that allows you to take advantage of the high performance Slingshot network.</li>
<li><code>cray-mpich</code> is a CUDA-aware MPI implementation, optimized for Cray systems.</li>
<li><code>cce</code> is the compiler from Cray. C/C++ compilers are based on Clang/LLVM while Fortran supports Fortran 2018 standard. More info: <a href="https://user.cscs.ch/computing/compilation/cray/">https://user.cscs.ch/computing/compilation/cray/</a></li>
</ul>
<p>You can switch between different programming environments. You can check the available module with the <code>module avail</code> command, as follows:</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a>🔥<span class="w"> </span><span class="o">[</span>caubet_m@login001:~<span class="o">]</span><span class="c1"># module avail PrgEnv</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>---------------------<span class="w"> </span>/opt/cray/pe/lmod/modulefiles/core<span class="w"> </span>---------------------
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a>PrgEnv-cray/8.5.0<span class="w"> </span>PrgEnv-gnu/8.5.0
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a>PrgEnv-nvhpc/8.5.0<span class="w"> </span>PrgEnv-nvidia/8.5.0
</span></code></pre></div>
<h2 id="switching-compiler-suites">Switching compiler suites<a class="headerlink" href="#switching-compiler-suites" title="Permanent link"></a></h2>
<p>Compiler suites can be exchanged with PrgEnv (Programming Environments) provided by HPE-Cray. The wrappers call the correct compiler with appropriate options to build
and link applications with relevant libraries, as required by the loaded modules (only dynamic linking is supported) and therefore should replace direct calls to compiler
drivers in Makefiles and build scripts.</p>
<p>To swap the the compiler suite from the default Cray to GNU compiler, one can run the following.</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a>🔥<span class="w"> </span><span class="o">[</span>caubet_m@login001:~<span class="o">]</span><span class="c1"># module swap PrgEnv-cray/8.5.0 PrgEnv-gnu/8.5.0</span>
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a>Lmod<span class="w"> </span>is<span class="w"> </span>automatically<span class="w"> </span>replacing<span class="w"> </span><span class="s2">"cce/17.0.0"</span><span class="w"> </span>with<span class="w"> </span><span class="s2">"gcc-native/12.3"</span>.
</span></code></pre></div>
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