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<li class="breadcrumb-item"><a href="index.html"><span class="section-number">8. </span>Process placement</a></li>
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<li class="breadcrumb-item active"><span class="section-number">8.8. </span>Rankfiles</li>
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<h1><span class="section-number">8.8. </span>Rankfiles<a class="headerlink" href="#rankfiles" title="Permalink to this heading"></a></h1>
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<p>Another way to specify arbitrary mappings is with a rankfile, which
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gives you detailed control over process binding as well.</p>
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<p>Rankfiles are text files that specify detailed information about how
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individual processes should be mapped to nodes, and to which
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processor(s) they should be bound. Each line of a rankfile specifies
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the location of one process. The general form of each line in the
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rankfile is:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">rank</span> <span class="o"><</span><span class="n">N</span><span class="o">>=<</span><span class="n">hostname</span><span class="o">></span> <span class="n">slot</span><span class="o">=<</span><span class="n">slot</span> <span class="nb">list</span><span class="o">></span>
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</pre></div>
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</div>
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<p>For example:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ cat myrankfile
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rank 0=aa slot=10-12
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rank 1=bb slot=0,1,4
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rank 2=cc slot=1-2
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$ prun --host aa,bb,cc,dd --map-by rankfile:FILE=myrankfile ./a.out
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</pre></div>
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</div>
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<p>Means that:</p>
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<ul class="simple">
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<li><p>Rank 0 runs on node aa, bound to logical cores 10-12.</p></li>
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<li><p>Rank 1 runs on node bb, bound to logical cores 0, 1, and 4.</p></li>
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<li><p>Rank 2 runs on node cc, bound to logical cores 1 and 2.</p></li>
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</ul>
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<p>Similarly:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ cat myrankfile
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rank 0=aa slot=1:0-2
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rank 1=bb slot=0:0,1,4
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rank 2=cc slot=1-2
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$ prun --host aa,bb,cc,dd --map-by rankfile:FILE=myrankfile ./a.out
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</pre></div>
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</div>
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<p>Means that:</p>
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<ul class="simple">
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<li><p>Rank 0 runs on node aa, bound to logical package 1, cores 10-12 (the
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0th through 2nd cores on that package).</p></li>
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<li><p>Rank 1 runs on node bb, bound to logical package 0, cores 0, 1,
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and 4.</p></li>
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<li><p>Rank 2 runs on node cc, bound to logical cores 1 and 2.</p></li>
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</ul>
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<p>The hostnames listed above are “absolute,” meaning that actual
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resolvable hostnames are specified. However, hostnames can also be
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specified as “relative,” meaning that they are specified in relation
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to an externally-specified list of hostnames (e.g., by <code class="docutils literal notranslate"><span class="pre">prun</span></code>’s
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<code class="docutils literal notranslate"><span class="pre">--host</span></code> argument, a hostfile, or a job scheduler).</p>
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<p>The “relative” specification is of the form “<code class="docutils literal notranslate"><span class="pre">+n<X></span></code>”, where <code class="docutils literal notranslate"><span class="pre">X</span></code>
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is an integer specifying the Xth hostname in the set of all available
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hostnames, indexed from 0. For example:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ cat myrankfile
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rank 0=+n0 slot=10-12
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rank 1=+n1 slot=0,1,4
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rank 2=+n2 slot=1-2
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$ prun --host aa,bb,cc,dd --map-by rankfile:FILE=myrankfile ./a.out
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</pre></div>
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</div>
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<p>All package/core slot locations are be specified as <em>logical</em>
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indexes. You can use tools such as HWLOC’s <code class="docutils literal notranslate"><span class="pre">lstopo</span></code> to find the
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logical indexes of packages and cores.</p>
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