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<li class="toctree-l1 current"><a class="reference internal" href="index.html">7. Host specification</a><ul class="current">
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<li class="breadcrumb-item"><a href="index.html"><span class="section-number">7. </span>Host specification</a></li>
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<li class="breadcrumb-item active"><span class="section-number">7.2. </span>Hostfiles</li>
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.wy-table-responsive table td,.wy-table-responsive table th{white-space:normal}
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<h1><span class="section-number">7.2. </span>Hostfiles<a class="headerlink" href="#hostfiles" title="Permalink to this heading"></a></h1>
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<p>Hostfiles (sometimes called “machine files”) are a combination of two
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things:</p>
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<ol class="arabic simple">
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<li><p>A listing of hosts on which to launch processes.</p></li>
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<li><p>Optionally, limit the number of processes which can be launched on
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each host.</p></li>
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</ol>
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<p>Hostfile syntax consists of one node name on each line, optionally
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including a designated number of “slots”:</p>
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<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span><span class="c1"># This is a comment line, and will be ignored</span>
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node01<span class="w"> </span><span class="nv">slots</span><span class="o">=</span><span class="m">10</span>
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node13<span class="w"> </span><span class="nv">slots</span><span class="o">=</span><span class="m">5</span>
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node15
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node16
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node17<span class="w"> </span><span class="nv">slots</span><span class="o">=</span><span class="m">3</span>
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...
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</pre></div>
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</div>
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<p>Blank lines and lines beginning with a <code class="docutils literal notranslate"><span class="pre">#</span></code> are ignored.</p>
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<p>A “slot” is the PRRTE term for an allocatable unit where we can launch
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a process. See the section on definition of the term <code class="docutils literal notranslate"><span class="pre">slot</span></code> for a
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longer description of slots.</p>
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<p>In the absence of the <code class="docutils literal notranslate"><span class="pre">slot</span></code> parameter, PRRTE will assign either the
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number of slots to be the number of CPUs detected on the node or the
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resource manager-assigned value if operating in the presence of an
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RM.</p>
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<div class="admonition important">
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<p class="admonition-title">Important</p>
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<p>If using a resource manager, the user-specified number
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of slots is capped by the RM-assigned value.</p>
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