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<h1 id="RADICAL-Pilot-Tutorial">RADICAL-Pilot Tutorial<a class="anchor-link" href="#RADICAL-Pilot-Tutorial"></a></h1><p>Utilize the examples below to familiarize yourself with RADICAL-Pilot.</p>
<p>We will:</p>
<ul>
<li>Modify settings (environment variables) if needed</li>
<li>Modify the example to print out the hostname of the machine that runs the Pilot</li>
</ul>
<p><strong>Please make sure that you always close the session before terminating the notebook using <code>session.close()</code></strong></p>
<h2 id="1-RADICAL-Pilot-Setup">1 RADICAL-Pilot Setup<a class="anchor-link" href="#1-RADICAL-Pilot-Setup"></a></h2><p>Documentation: <a href="http://radicalpilot.readthedocs.org/en/latest/machconf.html#preconfigured-resources">http://radicalpilot.readthedocs.org/en/latest/machconf.html#preconfigured-resources</a></p>
<p>First, we will import the necessary dependencies and define some helper functions.</p>
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<div class=" highlight hl-ipython2"><pre>
<span class="kn">import</span> <span class="nn">os</span><span class="o">,</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">radical.pilot</span> <span class="kn">as</span> <span class="nn">rp</span>
<span class="o"></span>radicalpilot-version
</pre></div>
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<h2 id="2.-Local-Pilot-Example">2. Local Pilot Example<a class="anchor-link" href="#2.-Local-Pilot-Example"></a></h2><p>This example shows how to execute a task using a Pilot-Job running on the local machine. In this case, the Pilot-Job is started using <strong>ssh</strong> on the edge node machine of the Hadoop cluster (which runs Jupyterhub - the iPython notebook server).</p>
<h3 id="2.1-Create-a-new-Session-and-Pilot-Manager.">2.1 Create a new Session and Pilot-Manager.<a class="anchor-link" href="#2.1-Create-a-new-Session-and-Pilot-Manager."></a></h3>
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<div class=" highlight hl-ipython2"><pre><span class="n">session</span> <span class="o">=</span> <span class="n">rp</span><span class="o">.</span><span class="n">Session</span><span class="p">()</span>
<span class="n">pmgr</span> <span class="o">=</span> <span class="n">rp</span><span class="o">.</span><span class="n">PilotManager</span><span class="p">(</span><span class="n">session</span><span class="o">=</span><span class="n">session</span><span class="p">)</span>
<span class="n">umgr</span> <span class="o">=</span> <span class="n">rp</span><span class="o">.</span><span class="n">UnitManager</span> <span class="p">(</span><span class="n">session</span><span class="o">=</span><span class="n">session</span><span class="p">,</span>
<span class="n">scheduler</span><span class="o">=</span><span class="n">rp</span><span class="o">.</span><span class="n">SCHED_ROUND_ROBIN</span><span class="p">)</span>
<span class="k">print</span> <span class="s2">"Session id: </span><span class="si">%s</span><span class="s2"> Pilot Manager: </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">session</span><span class="o">.</span><span class="n">uid</span><span class="p">,</span> <span class="nb">str</span><span class="p">(</span><span class="n">pmgr</span><span class="o">.</span><span class="n">as_dict</span><span class="p">()))</span>
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<div class=" highlight hl-ipython2"><pre><span class="n">print_details</span><span class="p">(</span><span class="n">umgr</span><span class="o">.</span><span class="n">as_dict</span><span class="p">())</span>
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<h3 id="2.2-Submit-Pilot-and-add-to-Unit-Manager">2.2 Submit Pilot and add to Unit Manager<a class="anchor-link" href="#2.2-Submit-Pilot-and-add-to-Unit-Manager"></a></h3>
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<div class=" highlight hl-ipython2"><pre><span class="n">pdesc</span> <span class="o">=</span> <span class="n">rp</span><span class="o">.</span><span class="n">ComputePilotDescription</span><span class="p">()</span>
<span class="n">pdesc</span><span class="o">.</span><span class="n">resource</span> <span class="o">=</span> <span class="s2">"local.localhost"</span> <span class="c1"># NOTE: This is a "label", not a hostname</span>
<span class="n">pdesc</span><span class="o">.</span><span class="n">runtime</span> <span class="o">=</span> <span class="mi">10</span> <span class="c1"># minutes</span>
<span class="n">pdesc</span><span class="o">.</span><span class="n">cores</span> <span class="o">=</span> <span class="mi">2</span>
<span class="n">pdesc</span><span class="o">.</span><span class="n">cleanup</span> <span class="o">=</span> <span class="bp">True</span>
<span class="n">pilot</span> <span class="o">=</span> <span class="n">pmgr</span><span class="o">.</span><span class="n">submit_pilots</span><span class="p">(</span><span class="n">pdesc</span><span class="p">)</span>
<span class="n">umgr</span><span class="o">.</span><span class="n">add_pilots</span><span class="p">(</span><span class="n">pilot</span><span class="p">)</span>
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<div class=" highlight hl-ipython2"><pre><span class="n">print_details</span><span class="p">(</span><span class="n">pilot</span><span class="o">.</span><span class="n">as_dict</span><span class="p">())</span>
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<h3 id="2.3-Submit-Compute-Units">2.3 Submit Compute Units<a class="anchor-link" href="#2.3-Submit-Compute-Units"></a></h3><p>Create a description of the compute unit, which specifies the details of the task to be executed.</p>
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<div class=" highlight hl-ipython2"><pre><span class="n">cudesc</span> <span class="o">=</span> <span class="n">rp</span><span class="o">.</span><span class="n">ComputeUnitDescription</span><span class="p">()</span>
<span class="n">cudesc</span><span class="o">.</span><span class="n">environment</span> <span class="o">=</span> <span class="p">{</span><span class="s1">'CU_NO'</span><span class="p">:</span> <span class="mi">1</span><span class="p">}</span>
<span class="n">cudesc</span><span class="o">.</span><span class="n">executable</span> <span class="o">=</span> <span class="s2">"/bin/echo"</span>
<span class="n">cudesc</span><span class="o">.</span><span class="n">arguments</span> <span class="o">=</span> <span class="p">[</span><span class="s1">'I am CU number $CU_NO'</span><span class="p">]</span>
<span class="n">cudesc</span><span class="o">.</span><span class="n">cores</span> <span class="o">=</span> <span class="mi">1</span>
<span class="n">print_details</span><span class="p">(</span><span class="n">cudesc</span><span class="o">.</span><span class="n">as_dict</span><span class="p">())</span>
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<p>Submit the previously created ComputeUnit descriptions to the PilotManager. This will trigger the selected scheduler (in this case the round-robin scheduler) to start assigning ComputeUnits to the ComputePilots.</p>
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<div class=" highlight hl-ipython2"><pre><span class="k">print</span> <span class="s2">"Submit Compute Units to Unit Manager ..."</span>
<span class="n">cu_set</span> <span class="o">=</span> <span class="n">umgr</span><span class="o">.</span><span class="n">submit_units</span><span class="p">([</span><span class="n">cudesc</span><span class="p">])</span>
<span class="k">print</span> <span class="s2">"Waiting for CUs to complete ..."</span>
<span class="n">umgr</span><span class="o">.</span><span class="n">wait_units</span><span class="p">()</span>
<span class="k">print</span> <span class="s2">"All CUs completed successfully!"</span>
<span class="n">cu_results</span> <span class="o">=</span> <span class="n">cu_set</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">details</span><span class="o">=</span><span class="n">cu_results</span><span class="o">.</span><span class="n">as_dict</span><span class="p">()</span>
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<p>Parse the output of the CU</p>
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<div class=" highlight hl-ipython2"><pre><span class="k">print</span> <span class="n">cu_results</span><span class="o">.</span><span class="n">stdout</span><span class="o">.</span><span class="n">strip</span><span class="p">()</span>
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<h3 id="2.6-Close-and-Delete-Session">2.6 Close Session<a class="anchor-link" href="#2.6-Close-and-Delete-Session"></a></h3>
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<div class=" highlight hl-ipython2"><pre><span class="n">session</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
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